燃油冷却面板传热特性试验与计算分析研究

The investigation on heat transfer characteristic tests and thermal evaluation of fuel-cooled panels

采用热电偶测温、气壁红外测温及燃油样品裂解度测量等多种手段,在DJ-21电弧加热器上进行了燃油冷却面板传热特性试验。进行了共计19次燃油冷却面板传热特性试验,试验高状态对应平均热流为1.6MW/m2,低状态对应平均热流为1.1MW/m2;用于冷却的燃油质量流率为1.84～5.8g/s。为了反映冷却面板热流密度分布,以喷管三维流动计算结果作为输入条件,将计算得到的热流密度与试验测量的冷壁热流密度比较,用以确定流场计算方案、流场切取方案和热流密度计算方案。发展了冷却面板稳态准三维热分析程序,将等效热流对应的冷壁对流换热系数和燃气总温作为高温燃气侧的边界条件。使用热分析程序完成了相应的计算。通过试验与计算数据对比研究,表明热分析计算的可信性。试验验证了冷却面板的设计与加工是可行的。

Heat transfer characteristic experiments of the fuel-cooled panels were conducted in the DJ-21 arc heater,during those tests several instrumentations such as thermocouple and infrared thermocamera were employed.The cracking rate of fuel sample was analyzed.19 tests were conducted,the maximum of the average heat flux was 1.6MW/m2,the minimum was 1.1MW/m2.The range of the cooling fuel mass flow rate was 1.84～5.8g/s.In order to obtain the heat flux distribution on the panel,the three dimensional nozzle flow calculation result was an input for the heat flux computation.The schemes such as nozzle flow calculation,flow data extract and heat flux calculation were determined by comparing the heat flux calculation with the cold wall heat flux experimentation.A quasi three-dimensional thermal evaluation code for fuel-cooled panels was developed.The cold wall convection heat transfer coefficient corresponding to the equivalent heat flux and the gas total temperature is the input for the gas-side boundary condition.The relevant evaluation was completed by the thermal evaluation code.The investigation on the comparision between tests and calculation shows that thermal evaluation is credible.The tests validate that the design and fabrication of fuel-cooled panels is applicable.