【作者】 曾豪； 胡练； 陈德奇； 高虹；

【Author】 Zeng Hao;Hu Lian;Chen Deqi;Hong Gao;College of Energy and Power Engineering, Chongqing University;School of Aeronautics and Astronautics, Chongqing University;

【机构】 重庆大学能源与动力工程学院； 重庆大学航空航天学院；

【摘要】 印刷电路板式换热器(PCHE)是一种能运用于核能、液化天然气等多个领域的新型换热器。本文采用计算流体力学方法对Z形PCHE的流动传热特性开展研究。以超临界二氧化碳作为工质,湍流模型采用SST k-ω模型,使用FLUENT中分段线性插值的方式控制二氧化碳的物性进行数值模拟。模拟结果表明,PCHE流场具有周期性分布的特点,通道弯折处流体扰动增强,流体速度增大,弯折处附近存在漩涡。工质温度升高会使换热系数减小,高热侧入口温度下流体的温度区间跨度较大,换热系数有较为明显的减小;除此之外,二氧化碳物性变化会导致换热系数变化趋势存在转折点。更多还原

【Abstract】 Printed Circuit Heat Exchanger(PCHE) is a new type of heat exchanger that can be used in many fields such as nuclear energy and liquefied natural gas. In this paper, the computational fluid dynamics method is used to investigate the thermal hydraulic characteristics of the printed circuit heat exchangers with zigzag channels This simulation uses supercritical carbon dioxide as the working fluid, and uses the piecewise linear interpolation method in FLUENT to control the physical properties of carbon dioxide. The turbulence model adopts the SST k-ω model. Simulation results show that the PCHE flow field has the characteristics of periodic distribution. The fluid disturbance at the bend of the channel is enhanced, fluid velocity has been increased, and there exists some vortex. The increase of the working temperature will reduce the heat transfer coefficient. The temperature range of the fluid at the inlet temperature of the high heat side is larger, and the heat transfer coefficient is significantly reduced. In addition, the change of the carbon dioxide property will cause a turning point in the trend of the heat transfer coefficient.更多还原