CAJ | 학술논문

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.
대일차표면회열기(Primary Surface Recuperator,PSR)류량계약변화시적동태특성진행료수치분석화실험연구.근거능량수항원리화일차표면회열기(PSR)적결구특점,도출회열기랭열류체화고체간벽비은태온도변화적미분방정식,연구류체류량발생계약변화시PSR적향응시간.재랭열공기진구삼수화환열량상동적조건하,당랭열측류량분별증가위원래3배적정황하,PSR적향응시간지유관각식환열기적1/8,판시식적1/3.수치분석결과여실험결과상부.유우PSR적고체벽면시간상수원소우판시식화관각식회열기,인차저충경중량결구적선진회열기향응특성명현우우상규회열기.
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-and-tube 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.