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Hopping-Aware Cluster Header Capability for Sensor Relocation in Mobile IoT Networks 认领 引用
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作者 Moonseong Kim Jaeyoung Park +1 位作者 Young-Joon Kim Woochan Lee 《Intelligent Automation & Soft Computing》 SCIE 2023年第5期1613-1625,共13页
Mobile sensor nodes such as hopping sensors are of critical importance in data collection.However,the occurrence of sensing holes is unavoidable due to the energy limitation of the nodes.Thus,it is evident that the re... Mobile sensor nodes such as hopping sensors are of critical importance in data collection.However,the occurrence of sensing holes is unavoidable due to the energy limitation of the nodes.Thus,it is evident that the relocation of mobile sensors is the most desirable method to recover the sensing holes.The previous research conducted by the authors so far demonstrated the most realistic hopping sensor relocation scheme,which is suitable for the distributed environment.In previous studies,the cluster header plays an essential role in detecting the sensing hole and requesting the neighboring cluster to recover the sensing hole that occurred in the sensor node.However,the limitations of the cluster header in the previously proposed relocation protocol are not fully considered.Because the cluster header jumps more frequently than non-header nodes,its energy con-sumption is relatively high compared to other nodes.Therefore,it is most likely to lead to header node failure and can lead to data loss on the network.In this paper,the jumping ability and energy consumption of the cluster header are seriously considered.Additional ability to replace cluster headers in case of failure is also implemented.Simulation results show that the data collection time can be further increased,which demonstrates the validity of the proposed algorithms. 展开更多
关键词 Hopping sensor mobileinternetofthings relocationprotocol header node numericalsimulation
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Effect of Header Configuration on Refrigerant Distribution in Parallel Flow Microchannel Evaporators 认领 引用 被引量：3
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作者 YU Dengjia LIU Jinwei +3 位作者 Lü Hongbin SHI Junye YOU Dian CHEN Jiangping 《Journal of Shanghai Jiaotong university(Science)》 EI 2019年第3期273-280,共8页
The refrigerant flow distribution in the parallel flow microchannel evaporators is experimentally investigated to study the effect of header configuration.Six different configurations are tested in the same evaporator... The refrigerant flow distribution in the parallel flow microchannel evaporators is experimentally investigated to study the effect of header configuration.Six different configurations are tested in the same evaporator by installing insertion device and partition plate in the header to ensure the consistency of the other structure parameters.The results show that the uniformity of refrigerant flow distribution and the heat transfer rate are greatly improved by reducing the sectional area of header.The heat transfer rate can increase by 67.93%by reducing the sectional area of both inlet and outlet headers.The uniformity of refrigerant flow distribution and the heat transfer rate become worse after installing the partition plate in the insertion devices and changing the inner structure of the header further. 展开更多
关键词 refrigerant distribution header microchannel evaporator two-phase flow
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Impact of Portable Executable Header Features on Malware Detection Accuracy 认领 引用 被引量：1
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作者 Hasan H.Al-Khshali Muhammad Ilyas 《Computers, Materials & Continua》 SCIE EI 2023年第1期153-178,共26页
One aspect of cybersecurity,incorporates the study of Portable Executables(PE)files maleficence.Artificial Intelligence(AI)can be employed in such studies,since AI has the ability to discriminate benign from malicious... One aspect of cybersecurity,incorporates the study of Portable Executables(PE)files maleficence.Artificial Intelligence(AI)can be employed in such studies,since AI has the ability to discriminate benign from malicious files.In this study,an exclusive set of 29 features was collected from trusted implementations,this set was used as a baseline to analyze the presented work in this research.A Decision Tree(DT)and Neural Network Multi-Layer Perceptron(NN-MLPC)algorithms were utilized during this work.Both algorithms were chosen after testing a few diverse procedures.This work implements a method of subgrouping features to answer questions such as,which feature has a positive impact on accuracy when added?Is it possible to determine a reliable feature set to distinguish a malicious PE file from a benign one?when combining features,would it have any effect on malware detection accuracy in a PE file?Results obtained using the proposed method were improved and carried few observations.Generally,the obtained results had practical and numerical parts,for the practical part,the number of features and which features included are the main factors impacting the calculated accuracy,also,the combination of features is as crucial in these calculations.Numerical results included,finding accuracies with enhanced values,for example,NN_MLPC attained 0.979 and 0.98;for DT an accuracy of 0.9825 and 0.986 was attained. 展开更多
关键词 AI driven cybersecurity artificial intelligence cybersecurity Decision Tree Neural Network Multi-Layer Perceptron Classifier portable executable(PE)file header features
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Mechanical Stress Analysis of a 600MW Supercritical Boiler Superheater Outlet Header 认领 引用 被引量：2
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作者 Dongyi Li Zhongguang Fu +1 位作者 Qiang Zhang Ting He 《Engineering（科研）》 2013年第1期66-68,共3页
The mechanical stress distribution and the stress concentrations of the superheater outlet header of a 600MW supercritical boiler were analyzed by the finite element method. The results showed that the stress concentr... The mechanical stress distribution and the stress concentrations of the superheater outlet header of a 600MW supercritical boiler were analyzed by the finite element method. The results showed that the stress concentrated at the inside conjunction area between the pipe and the header cylinder , and the value of the maximum mechanical stress concentration factor is 2.51. 展开更多
关键词 Superheater Outlet header Finite Element Method Stress Concentration
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An Analysis of the Influence of Protective Films on the Inner Surfaces of CCPP Headers and Steam Pipelines on Their Thermal Stress State 认领 引用
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作者 Yury A. Radin Tatiana S. Kontorovich 《American Journal of Analytical Chemistry》 CAS 2017年第1期116-124,共9页
At present, the main attention of researchers is paid to the deterioration of heat transfer when heating the outer surface of the pipe with the liquid or steam, flowing inside it, in the presence of films or deposits ... At present, the main attention of researchers is paid to the deterioration of heat transfer when heating the outer surface of the pipe with the liquid or steam, flowing inside it, in the presence of films or deposits on its inner surface. However, when pipe is heating by heat carrier medium, flowing inside it, film on the inner pipe surface serve a dual protective function, protecting the pipe from corrosion and reducing its thermal stress. The article represents the results of the computational analysis of protective films influence on the thermal stressed state of headers and steam pipelines of combined-cycle power plants (CCPP) heat-recovery steam generators at different transient operating conditions particularly at startups from different initial temperature states and thermal shock. It is shown that protective films have a significant influence on the stresses magnitude and damage accumulation mainly for great temperature disturbances (for thermal shock). Calculations were carried out at various thicknesses of films and assuming that their thermal conductivity less than thermal conductivity of the steam pipelines metal. 展开更多
关键词 Heat-Recovery Steam Generator Header Steam Pipeline Protective Film Stress Thermal Shock Startup Equivalent Operating Hours
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A Study on Control System of Robot Working Unit for Automatically Welding Nipples onto Header of Boiler 认领 引用
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作者 陶谦 于树锋 +1 位作者 姜山 曹佩军 《Journal of Harbin Institute of Technology(New Series)》 CAS 1996年第2期64-68,共5页
The difficult problem of automatically welding nipples onto the header is first analyzed in this paper, and then the overall structure and operating principle of the robot working unit are introduced. The robot and th... The difficult problem of automatically welding nipples onto the header is first analyzed in this paper, and then the overall structure and operating principle of the robot working unit are introduced. The robot and the measuring device are located by employing the traveling lorry, and this unit enables the robot to adjust the tracks according to the errors received from the measuring device, and then the nipples are welded properly. This paper emphases on the development of the master-slave control system, in which the prograrmmable Logic Controller (PLC) is used as the master computer. 展开更多
关键词 ss:Header nipple PLC robot control welding working unit master-slave control
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Refrigerant Distribution Characteristics in Vertical Header of Flat-Tube Heat Exchanger without Internal Protrusion 认领 引用
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作者 Kazuhiro Endoh 《Journal of Energy and Power Engineering》 CAS 2017年第10期655-664,共10页
A heat exchanger that arranges flat tubes horizontally has a vertical header that distributes the refrigerant to each tube. When the heat exchanger works as an evaporator, differences in flow conditions at each branch... A heat exchanger that arranges flat tubes horizontally has a vertical header that distributes the refrigerant to each tube. When the heat exchanger works as an evaporator, differences in flow conditions at each branch, such as the ratio and distribution of vapor and liquid, due to the differences in densities and momentums of vapor and liquid in the two-phase flow make equal distribution difficult. This paper describes the distribution characteristics of a four-branch header that has a rectangular cross-section without the internal protrusion of flat tubes in the case of the inflow of the refrigerant R32 from the bottom of the header by using an equipment that can estimate the distribution ratio of the liquid and vapor phase to each branch. This paper also discusses the distribution characteristics on the basis of the flow visualization in the header. The flow visualization shows that a liquid level that contains vapor phase exists in the header and affects the distribution greatly. 展开更多
关键词 Refrigerant distribution vapor-liquid two-phase flow header flat tube heat exchanger.
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The trend of mechanizing road header for coal mine entry 认领 引用
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作者 HUI Xing-tian 《Journal of Coal Science & Engineering(China)》 2010年第1期99-103,共5页
In discussing coal mine entry construction with rock bolt technology, examinedthe craft and machinery problems as well as the conditions in which to use each kind ofmachine and tool.It exposed the intrinsic flaws of t... In discussing coal mine entry construction with rock bolt technology, examinedthe craft and machinery problems as well as the conditions in which to use each kind ofmachine and tool.It exposed the intrinsic flaws of the widely used road header.The problemis that it was designed according to early timbering support state but is not suitable forrock bolt technology.The way to improve the function of existing road headers is notthrough parallel operations but using the SUDM (Shield Union Driving Machine), which isa new machine that improves construction.This article proposed a few solutions in designto solve this problem. 展开更多
关键词 coalmine gateway mine entry construction road header mechanization suggestion
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Secure Web Application Technologies Implementation through Hardening Security Headers Using Automated Threat Modelling Techniques 认领 引用
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作者 Maduhu Mshangi Mlyatu Camilius Sanga 《Journal of Information Security》 2023年第1期1-15,共15页
This paper investigates whether security headers are enforced to mitigate cyber-attacks in web-based systems in cyberspace. The security headers examined include X-Content-Type-Options, X-Frame-Options, Strict-Transpo... This paper investigates whether security headers are enforced to mitigate cyber-attacks in web-based systems in cyberspace. The security headers examined include X-Content-Type-Options, X-Frame-Options, Strict-Transport-Security, Referrer-Policy, Content-Security-Policy, and Permissions-Policy. The study employed a controlled experiment using a security header analysis tool. The web-based applications (websites) were analyzed to determine whether security headers have been correctly implemented. The experiment was iterated for 100 universities in Africa which are ranked high. The purposive sampling technique was employed to understand the status quo of the security headers implementations. The results revealed that 70% of the web-based applications in Africa have not enforced security headers in web-based applications. The study proposes a secure system architecture design for addressing web-based applications’ misconfiguration and insecure design. It presents security techniques for securing web-based applications through hardening security headers using automated threat modelling techniques. Furthermore, it recommends adopting the security headers in web-based applications using the proposed secure system architecture design. 展开更多
关键词 Secure Web Applications Security Headers Systems Security Secure Web Architecture Design
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STUDY ON THE METHODS OF STRUCTURALDYNAMIC MODIFICATION OPTIMIZATION OF ROAD HEADERS 认领 引用
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作者 吴淼 黄民 +1 位作者 王建军 魏任之 《Journal of China University of Mining and Technology》 1996年第2期62-68,共7页
In this paper, taking AM-50 Road Heaer as an example, the metheds of structural dynamic modification optimization for road headers are studied using experimental modal analysis and physical parameters analysis. The ma... In this paper, taking AM-50 Road Heaer as an example, the metheds of structural dynamic modification optimization for road headers are studied using experimental modal analysis and physical parameters analysis. The machine’s modal model and lumped mass model are established and the vibration response simulation is calculated for the two models with the load spectral measured. On the above basis, the dynamic parameters of the models are optimised and some useful results have been obtained.The research methods in this paper can be used for the reference to the other lager type mining machines. 展开更多
关键词 tunneling machine road headers structural dynamic medification
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油菜低损收获割台气力回收装置关键部件设计与试验 认领 引用 被引量：1
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作者 童学权 金裕国 +3 位作者 宋熙 吴明亮 蒋啸虎 罗海峰 《浙江农业学报》 CSCD 北大核心 2026年第1期170-183,共14页
针对油菜联合收获过程中割台损失率高的问题,采用“双向进风中间集中供气”方法设计了一种割台气力回收装置,该装置主要包括风机、传动系统、供气装置、割台和防溅挡板。通过供气装置产生的稳定风幕,以气吹方式实现炸荚掉落籽粒在割台... 针对油菜联合收获过程中割台损失率高的问题,采用“双向进风中间集中供气”方法设计了一种割台气力回收装置,该装置主要包括风机、传动系统、供气装置、割台和防溅挡板。通过供气装置产生的稳定风幕,以气吹方式实现炸荚掉落籽粒在割台上的定向回收,从而达到低损收获。基于Fluent对供气装置气流管道内部流场进行仿真优化,以气流主管左右进风口内径、气流变径管末端内径和气流支管出口内径为试验因素,以出口风速不均匀性为评价指标,开展三元二次回归正交组合仿真试验。结果表明,影响出口风速不均匀性的主次顺序依次为气流支管出口内径、气流变径管末端内径、气流主管左右进风口内径;管道最优参数组合为气流主管左右进风口内径63 mm、气流变径管末端内径56 mm、气流支管出口内径14 mm。以风机转速、水平距离和水平倾角为试验因素,以籽粒回收率为评价指标,开展台架试验;结果表明,当风机转速3000 r·min-1、水平距离350.5 mm、水平倾角76.8°时籽粒回收效果最佳。在现有油菜联合收获机上,利用脱粒动力加装一套机械传动系统驱动气力回收装置,试制了油菜气吹式割台低损联合收获机。该气力回收装置出口风速不均匀性为1.19%,气流稳定性良好;田间试验结果表明,割台损失率为2.75%,较未启用气力回收功能时割台损失率降低1.3百分点,实现了低损联合收获作业。 展开更多
关键词 油菜 联合收获 割台损失 气力回收 计算流体力学仿真
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多尺度信息增强的遥感图像目标检测算法 认领 引用 被引量：1
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作者 杨路 刘俊杰 余翔 《计算机工程》 CAS CSCD 北大核心 2026年第4期200-213,共14页
针对复杂背景遥感图像中小目标密集、目标尺度变化大等因素给目标检测带来的特征提取困难、精度不佳的问题,在YOLOv5s基础上提出一种多尺度信息增强的目标检测算法——深度学习YOLO(DL-YOLO)。首先,改进算法在主干网络顶部采用基于快速... 针对复杂背景遥感图像中小目标密集、目标尺度变化大等因素给目标检测带来的特征提取困难、精度不佳的问题,在YOLOv5s基础上提出一种多尺度信息增强的目标检测算法——深度学习YOLO(DL-YOLO)。首先,改进算法在主干网络顶部采用基于快速空间金字塔池化设计的空洞卷积快速空间金字塔池化,通过其中的感受野增强模块(RFEB)融合多尺度目标的细节信息与语义信息,提高网络的特征提取能力。其次,改进算法的检测头部分采用以YOLOv6s解耦头(DH)为基础设计的轻量高效解耦头(LEDH)来替换原有的检测头,在该解耦头中设计了轻量化空洞全局深度卷积(GDConv)模块来增强分类与回归任务关联信息的学习,以及引用轻量化卷积实现轻量化,在提高各尺度目标检测精度的同时,降低解耦头参数量。在DIOR数据集上的实验结果表明,与YOLOv5s相比,提出的DL-YOLO算法在精确率、召回率、mAP@0.5、mAP上分别提高了1.6、2.1、2.1和4.7百分点,综合指标超过了现有优秀的目标检测算法,对遥感图像中多尺度目标检测具有实际应用意义。 展开更多
关键词 遥感图像 复杂背景 YOLOv5s算法 多尺度目标检测 解耦头
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CFB锅炉汽冷屏汇集集箱宽负荷集箱效应 认领 引用
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作者 马有福 陈煜 +2 位作者 迟童辉 杨超 吕俊复 《上海理工大学学报》 CAS 北大核心 2026年第1期69-77,共9页
随着新能源并网规模扩大,火电机组深度调峰需求日益突出,这对电站锅炉的宽负荷运行能力提出了更高要求。集箱效应对锅炉过热器并联管组的流量分配均匀性具有重要影响,研究锅炉宽负荷运行下的集箱效应,对锅炉安全灵活运行至关重要。以某1... 随着新能源并网规模扩大,火电机组深度调峰需求日益突出,这对电站锅炉的宽负荷运行能力提出了更高要求。集箱效应对锅炉过热器并联管组的流量分配均匀性具有重要影响,研究锅炉宽负荷运行下的集箱效应,对锅炉安全灵活运行至关重要。以某135 MW循环流化床锅炉的汽冷屏为例,在10%~100%BMCR负荷范围,对两种管径尺度汇集集箱(引出管ø219 mm×14 mm和出口集箱ø377 mm×20 mm)内的工质流动与压力分布特性进行数值模拟,获得锅炉负荷与管径尺度对汇集集箱集箱效应的影响。结果表明:随管径尺度增大,汇集集箱内流动行为趋于复杂,集箱效应增强;随锅炉负荷降低,汇集集箱内涡流与旋流的强度减弱,集箱效应减弱。对比汇集集箱内静压分布的模拟结果与我国水动力标准计算结果,表明水动力标准计算结果偏高,偏高幅度随汇集集箱管径增大而增大。 展开更多
关键词 循环流化床锅炉 汇集集箱 静压分布 集箱效应
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再生稻割台留桩高度自动调控系统设计与试验 认领 引用
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作者 余杨 李曾耀 +3 位作者 胡金鹏 行帅峰 吴钦昊 徐立章 《华南农业大学学报》 CAS CSCD 北大核心 2026年第2期315-325,共11页
【目的】为了解决再生稻头季机收时,留桩高度不稳定,伤害腋芽影响再生季产量的问题。【方法】本文提出一种再生稻留桩高度自动调控方法。确定了以毫米波测距传感器和位移传感器为主的割台离地高度在线监测方案,通过直线位移传感器对割... 【目的】为了解决再生稻头季机收时,留桩高度不稳定,伤害腋芽影响再生季产量的问题。【方法】本文提出一种再生稻留桩高度自动调控方法。确定了以毫米波测距传感器和位移传感器为主的割台离地高度在线监测方案,通过直线位移传感器对割台左右测距数据的阈值权重进行实时调整,提高割台离地高度测量精度;提出了基于多段阈值与卡尔曼滤波的割台离地高度原始数据处理方法,解决测距过程中田间叶片、杂草等环境干扰导致测距不精准的问题;采用模糊PID控制模型对割台高度自动调控。利用AMESIM与Simulink联合仿真验证控制模型的有效性,并开展了田间收获试验。【结果】田间试验结果显示,割台离地高度实时监测数据的标准差为5.6 mm、平均绝对误差为4.8 mm、均方根误差6.7 mm。开启割台高度调控系统后,留桩高度监测标准差均小于12 mm,变异系数均小于0.1。【结论】本文提出的再生稻割台留桩高度自动调控系统的控制精度较高、留桩高度合格,能够满足再生稻头季留桩高度一致性需求。 展开更多
关键词 再生稻 收获机 留桩高度 割台高度 自动调控 卡尔曼滤波 模糊PID控制
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基于材料非线性损伤演化的电站锅炉厚壁部件抗疲劳设计方法 认领 引用
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作者 王元良 韩兆威 +3 位作者 潘佩媛 朱忠亮 倪永中 徐鸿 《动力工程学报》 CAS CSCD 北大核心 2026年第5期74-81,共8页
针对电站锅炉厚壁部件在灵活性运行条件下的热机械疲劳损伤和寿命管理问题,提出了一种非线性损伤累积的疲劳寿命计算方法,同时给出了相应的抗疲劳设计及其逆向应用方法。开展了锅炉联箱三通结构的疲劳强度校核和700℃等级电站锅炉热态... 针对电站锅炉厚壁部件在灵活性运行条件下的热机械疲劳损伤和寿命管理问题,提出了一种非线性损伤累积的疲劳寿命计算方法,同时给出了相应的抗疲劳设计及其逆向应用方法。开展了锅炉联箱三通结构的疲劳强度校核和700℃等级电站锅炉热态启动方案的设计与优化。结果表明:所建立的双曲正弦函数形式的损伤演化模型能够较好地描述Inconel 617合金在不同应变幅下的低周疲劳损伤演化行为;在机组“两班制”的运行方式下,联箱三通结构在热态启动过程中的最大弹塑性等效应变幅不超过0.17%才能满足30 a的服役寿命要求;当锅炉热态启动时间缩短至45 min时,基于Neuber法和G-M法,由弹性解计算出的联箱三通结构服役寿命分别为38和50 a。 展开更多
关键词 疲劳损伤 寿命评估 Inconel 617合金 蒸汽联箱 启动优化
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履带式高粱收获机关键部件优化设计与试验 认领 引用
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作者 王伯龙 刘述昊 +4 位作者 刘洋 兰玉彬 耿端阳 王荣辉 赵永飞 《农业工程学报》 EI CAS CSCD 北大核心 2026年第10期13-21,共9页
随着高粱种植面积的扩大、农村劳动力的减少及白酒产业对高粱需求的增加,高效低损的高粱机械化收获需求日益迫切,割台易堵塞、秸秆倒伏及脱粒不彻底等问题限制其产业发展。通过设计分禾-聚拢杆协同机构,实现植株有序导流与防堵喂入;对... 随着高粱种植面积的扩大、农村劳动力的减少及白酒产业对高粱需求的增加,高效低损的高粱机械化收获需求日益迫切,割台易堵塞、秸秆倒伏及脱粒不彻底等问题限制其产业发展。通过设计分禾-聚拢杆协同机构,实现植株有序导流与防堵喂入;对现有拨禾链条进行布局优化,改善秸秆倒向失衡问题;对现有脱粒滚筒进行参数优化,设计全新的前密后疏型变筛孔凹板结构,显著提升脱净率并降低籽粒破碎率。田间试验结果表明:在样机割茬高度300~600 mm、前进速度0.6~1.2 m/s时,总损失率1.25%~1.71%,籽粒破损率0.48%~0.72%,含杂率0.72%~1.06%,各项性能指标均达到或优于国家标准,该机满足高粱收获作业中高效低损的行业要求。研究成果可为高粱主产区高效、低损收获装备的设计与推广提供技术支撑。 展开更多
关键词 高粱收获机 割台防堵机构 低损脱粒 参数化设计 田间验证
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再生稻收割机割台高度自适应调控系统的设计与试验 认领 引用
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作者 何丽红 杨浩 +2 位作者 郑锐 龙宇 徐红梅 《华中农业大学学报》 CAS CSCD 北大核心 2026年第3期314-326,共13页
为提升再生稻收获质量与作业效率,设计一种再生稻收割机割台高度自适应调控系统。建立割台高度控制系统的仿形轮结构模型,对4LZ-1.6Z型谷物联合收割机的液压系统进行改装优化,并基于Simulink搭建控制系统仿真模型,对比分析经典PID与模糊... 为提升再生稻收获质量与作业效率,设计一种再生稻收割机割台高度自适应调控系统。建立割台高度控制系统的仿形轮结构模型,对4LZ-1.6Z型谷物联合收割机的液压系统进行改装优化,并基于Simulink搭建控制系统仿真模型,对比分析经典PID与模糊PID 2种控制策略的系统性能;以响应精度和响应速度为试验指标开展性能验证。结果显示,经典PID控制和模糊PID控制的平均绝对误差分别为17.3、10.5 mm;在响应速度方面,经典PID控制在割台上升和下降阶段的平均值分别为0.185和0.213 m/s,而模糊PID控制相应平均值分别为0.202和0.219 m/s;基于模糊PID控制算法的路面起伏行走试验结果显示,割台距地高度稳定在500 mm左右,平均偏差为6.81 mm,稳定性变异系数为1.62%。研究表明,所提控制策略具有良好的稳定性和跟踪性能。 展开更多
关键词 收割机 割台 高度调控 控制系统 模糊PID
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Structural Optimization of the Inlet Header of Supercritical Carbon Dioxide Printed Circuit Board Heat Exchanger 认领 引用
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作者 WANG Yanquan LU Yuanwei +3 位作者 WANG Yuanyuan HAN Xinlong WU Yuting GAO Qi 《Journal of Thermal Science》 SCIE EI CAS CSCD 2024年第4期1458-1467,共10页
Supercritical carbon dioxide printed circuit board heat exchangers are expected to be applied in third-generation solar thermal power generation.However,the uniformity of supercritical carbon dioxide entering the heat... Supercritical carbon dioxide printed circuit board heat exchangers are expected to be applied in third-generation solar thermal power generation.However,the uniformity of supercritical carbon dioxide entering the heat exchanger has a significant impact on the overall performance of the heat exchanger.In order to improve the uniformity of flow distribution in the inlet header,this article studies and optimizes the inlet header of a printed circuit board heat exchanger through numerical simulation.The results indicate that when supercritical carbon dioxide flows through the header cavity,eddy currents will be generated,which will increase the uneven distribution of flow rate,while reducing the generation of eddy currents will improve the uniform distribution of flow rate.When the dimensionless factor of the inlet header is 6,the hyperbolic configuration is the optimal structure.We also reduced the eddy current region by adding transition segments,and the results showed that the structure was the best when the dilation angle was 10°,which reduced the non-uniformity by 21%compared to the hyperbolic configuration,providing guidance for engineering practice. 展开更多
关键词 third-generation solar thermal power generation inlet header PCHE numerical simulation
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百万级火电机组锅炉水冷壁下集箱状态监测系统 认领 引用
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作者 姜世凯 张春森 +3 位作者 王锟 杨国众 冷静 刘明禄 《科学技术创新》 2026年第9期94-98,共5页
为适应深度调峰需求,火力发电机组频繁处于低负荷运行状态,水冷壁集箱作为锅炉关键承压部件,其运行安全性面临严峻挑战。本文针对锅炉水冷壁下集箱状态在线监测开展研究,研发多种类信号集成采集、传输与处理技术,构建高温构件在线状态... 为适应深度调峰需求,火力发电机组频繁处于低负荷运行状态,水冷壁集箱作为锅炉关键承压部件,其运行安全性面临严峻挑战。本文针对锅炉水冷壁下集箱状态在线监测开展研究,研发多种类信号集成采集、传输与处理技术,构建高温构件在线状态监测系统。通过实测数据与结构参数建立数学模型,获取不同工况下重点部位的位移、温度场及应力变化规律,确定关键位置热位移或温度场的预警阈值,实现长集箱安全稳定运行及智能化管理,为智慧电厂决策提供有力数据支撑。 展开更多
关键词 锅炉膨胀 水冷壁集箱 三维可视化 应力分析
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某350MW超临界锅炉侧墙水冷壁出口集箱管接头裂纹原因分析及改造处理 认领 引用
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作者 李金凤 王慧文 徐嘉 《锅炉制造》 2026年第2期11-13,共3页
详细描述了某350MW超临界锅炉侧墙水冷壁出口集箱管接头、水冷壁管鳍片频繁出现裂纹泄露等情况,并分析了导致上述缺陷的原因,结合缺陷原因给出了改造方案,通过改造解决了集箱频繁裂纹、泄漏的缺陷,并介绍了改造效果。
关键词 350MW超临界锅炉 侧墙水冷壁出口集箱 裂纹
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