旋转盘腔稳态换热试验的时间相关性  

Time-related steady heat transfer experiments in rotating disk cavity

作　　者：丁水汀[1,2,3] 赵罡 邱天 于航[3] DING Shuiting;ZHAO Gang;QIU Tian;YU Hang(Beijing Key Laboratory on Safety of Integrated Aircraft and Propulsion System, School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, Chin;Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100191;School of Beijing University of Aerona Energy and Power Engineering, utics and Astronautics, Beijing 100191, China)

机构地区：[1]北京航空航天大学能源与动力工程学院北京市航空器/发动机复杂系统安全性重点实验室,北京100191 [2]先进航空发动机协同创新中心,北京100191 [3]北京航空航天大学能源与动力工程学院,北京100191

出　　处：《航空动力学报》2018年第3期513-520,共8页Journal of Aerospace Power

基　　金：航空发动机复杂系统安全性教育部长江学者创新团队(IRT0905);中国博士后科学基金(2016M591047)

摘　　要：在稳态换热试验中,试验没有达到稳定就测量会增大误差,常见工况中盘面平均努塞尔数Nu误差的半衰期为2 500~2 700s。为判断试验是否达到稳定或可测量状态,采用瞬态计算方法对旋转盘腔换热试验的稳定时间的判定方法进行了研究。数值计算结果表明:对于旋转盘腔换热试验,稳定时间较长。提供了一种通过试验精度判定稳定时间和可测时间的方法,试验前可以由固体非稳态导热的傅里叶数估算可测时间。建议试验过程中每隔一段时间观测传感器数值,观测时间间隔按对数规律确定,直到传感器数值不变以确定达到稳定状态。Errors in steady heat transfer experiments increase if it is measured before steady state,and the half-life period of errors of average Nusselt number is about 2 500~2 700 sin general conditions.In order to modify the state of heat transfer experiments,rotating disk cavity heat transfer experiments were performed by transient numerical simulation.Results presented showed that it was a long time before steady state in heat transfer experiment of cavity.An approach of predicting steady time and allowable measurement time was developed by permissive errors of experiments,and allowable measurement time can be precalculated before experiments by Fourier number.It＇s also suggested that the sensors be ob-served per minutes by regularity of logarithm until the numbers of sensors are constant,then the experiment is in steady state.

关 键 词：旋转盘腔 换热试验 稳定时间 误差分析 瞬态导热 

分 类 号：V235.11[航空宇航科学与技术—航空宇航推进理论与工程]