印制电路热交换器芯高温蠕变和爆裂响应的有限元分析

Heramb P. Mahajan, U. Devi, T. Hassan
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引用次数: 4

摘要

印刷电路热交换器(PCHEs)具有高紧凑性和传热效率,这使得它们成为极高温反应器(vhtr)的一个有吸引力的选择。非核服务的PCHE设计方法在ASME规范第VIII节中有很好的规定;然而,PCHE核服务的ASME规范规则尚未制定。为了制定PCHE的ASME第三部分规范规则,研究开始于PCHE核心试样的设计,以遵循ASME第八部分的方法进行测试。采用有限元分析方法对PCHE试件的破坏响应进行了研究。采用非耦合本构材料模型进行二维等温平面应变分析。通过改变半圆形通道的形状和尺寸、PCHE核心尺寸和加载情况进行参数化研究,量化影响PCHE在压力蠕变和压力爆裂加载下失效响应的关键参数。结果表明,最大蠕变应变及其位置与PCHE芯尺寸有关。在分析中,通过考虑实际的半椭圆形通道形状而不是半圆形通道,可以观察到在通道尖角处蠕变应变的显著降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Finite Element Analysis of Printed Circuit Heat Exchanger Core for High Temperature Creep and Burst Responses
Printed Circuit Heat Exchangers (PCHEs) have high compactness and efficiency for heat transfer, which makes them an attractive option for the Very High Temperature Reactors (VHTRs). Design methodology of PCHE for non-nuclear service is well established in the ASME Code, Section VIII; however, ASME Code rules for PCHE nuclear services are yet to be developed. Towards developing the ASME Section III code rules for PCHE, the study started with the design of PCHE core specimens for testing following the ASME section VIII methodology. The failure responses of these PCHE specimens are investigated by using Finite Elements Analyses (FEA). Two dimensional isothermal plane strain analyses are performed using an uncoupled constitutive material model. Parametric studies by varying shape and size of semicircular channels, PCHE core size, and loading cases are performed to quantify the critical parameters which influence the PCHE failure responses under pressure creep and pressure burst loadings. Results indicate that the maximum creep strain and its location are dependent on the PCHE core size. Significant reduction in creep strains are observed at the channel sharp corners by considering a realistic semielliptical channel shape instead of a semicircular channel in the analysis.
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