SABRE预冷器结构参数对其性能影响的数值分析

Numerical Analysis of Effects of Pre-Cooler Structure Parameter on Its Performance in SABRE

预冷器作为SABRE系统中的核心部件之一,其性能决定了SABRE空气预冷效果。本文利用数值分析方法研究了预冷器外形几何参数和传热管排管紧凑度对其流动和换热特性的影响,结果表明,在工作热工参数范围内,两者对预冷器换热特性影响较小,换热功率相对变化小于7.2%,但对壳侧空气流动阻力影响很大,阻力压降最大可增加2倍以上;减小预冷器轴向高度、增加径向尺寸均有利于提高预冷器的综合性能;通过适当调整传热管束的排管紧凑程度,使预冷器的壳侧空气流动阻力压降满足设计要求。

Pre-cooler is one of the key components in SABRE system,playing a significant role in precooling of the air. In the present work,a numerical analysis was carried out to investigate the effects of geometry size and compactness of heat transfer tube arrangement on the flow and heat transfer characteristics of the precooler. It indicates that both of them have slight effect on heat transfer performance in the normal range of thermohydraulic parameters,with a relative change in the heat exchange power less than 7.2%,while a significant influence on air flow resistance of the shell side is shown,it may lead to a twice increase in pressure drop at most. Decreasing the axial height and increasing the radial size of the pre-cooler are beneficial to realize better comprehensive performance. An appropriate change of the compactness of the heat transfer tube arrangement can make it satisfy the requirement of the system to the air flow resistance of the shell side.