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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。
The heat transfer characteristics of the fuel cooling panel were tested on the DJ-21 arc heater using thermocouple temperature measurement, gas wall infrared temperature measurement and fuel sample cracking degree measurement. A total of 19 tests were carried out on the heat transfer characteristics of the fuel cooling panels. The average high-temperature heat flow was 1.6MW / m2 and the low-state average heat flow was 1.1MW / m2. The mass flow rate of the fuel for cooling was 1.84-5.8g / s. In order to reflect the heat flux density distribution of the cooling panel, taking the calculation results of the three-dimensional nozzle flow as the input condition, the calculated heat flux density is compared with the measured cold wall heat flux density to determine the flow field calculation scheme, the flow field cutting scheme and the heat flux density Calculation program. The steady-state quasi-three-dimensional thermal analysis program of the cooling panel has been developed. The convective heat transfer coefficient and the total gas temperature corresponding to the equivalent heat flow are taken as the boundary conditions for the high temperature gas. The corresponding calculation is done using the thermal analysis program. A comparative study of the experimental and calculated data shows the credibility of the thermal analysis calculation. The test verifies that the design and processing of the cooling panel are feasible.