一次表面回热器动态特性的数值模拟与实验研究  

Numerical Simulation and Experimental Study of the Dynamic Characteristics of a Primary Surface Recuperator

作　　者：刘振宇[1] 苏永康[1] 程惠尔[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《热能动力工程》2009年第6期696-699,共4页Journal of Engineering for Thermal Energy and Power

基　　金：海装十五预先研究基金资助项目(40101001)

摘　　要：对一次表面回热器(Primary Surface Recuperator,PSR)流量阶跃变化时的动态特性进行了数值分析和实验研究。根据能量守恒原理和一次表面回热器(PSR)的结构特点,导出回热器冷热流体和固体间壁非稳态温度变化的微分方程式,研究流体流量发生阶跃变化时PSR的响应时间。在冷热空气进口参数和换热量相同的条件下,当冷热侧流量分别增加为原来3倍的情况下,PSR的响应时间只有管壳式换热器的1/8,板翅式的1/3。数值分析结果与实验结果相符。由于PSR的固体壁面时间常数远小于板翅式和管壳式回热器,因此这种轻重量结构的先进回热器响应特性明显优于常规回热器。Numerically analyzed and experimentally studied were the dynamic characteristics of a primary surface recuperator(PSR) when it undergoes a step change of flow rates.In the light of the energy conservation theory and structural features of the PSR,a differential equation was derived,indicating a temperature change of the recuperator in an unsteady state between the cold and hot fluid as well as solid walls.Studied was the response time of PSR during the period of the fluid flow rate undergoing a step change.Under the condition that the inlet parameters and heat quantity exchanged between the cold and hot air are identical and the flow rates at the cold and hot side have increased to three times of the original ones respectively,the response time of the PSR is only 1/8 of a shell-andtube heat exchanger and 1/3 of a plate-fin type one.The numerical analytic results fully correspond to the test ones.As the time constant of the solid walls in the PSR is far less than that in a plate-fin type or a shell-and-tube recuperator,the response characteristics of the advanced recuperator with such a light weight structure are conspicuously superior to those of a conventional recuperator.

关 键 词：燃气轮机 一次表面回热器 动态特性 数值模拟 

分 类 号：TK479[动力工程及工程热物理—动力机械及工程] TK124