Total heat transfer measurements on a flight investigation of reentry environment model
Total heat transfer measurements on a flight investigation of reentry environment model
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再入环境模型飞行研究的总传热测量
DOI：
10.2514/1.a32333
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
R. Morgan
中科院分区：
文献类型：
--
作者：
Bianca R. Capra;R. Morgan
驻点总传热是在再入环境飞行调查 II 飞行器的 1:27.7 模型上测量的。实验在X1膨胀管中进行，等效飞行速度和静焓分别为11 km/s和12.7 MJ/kg。选择条件来复制总飞行时间为 1639.5 秒的飞行条件，其中辐射估计占总传热的 17-36%。理论上，在规模化实验中，这种贡献会减少到<2%，并且测试模型上的加热环境预计将以对流为主。开发了报告的飞行加热速率和预期实验加热之间的相关性（称为减少的飞行值），以预测测试模型上预期的加热水平。在给定的流量条件下，计算得出的飞行减少值为 150 MW/m2。测量的平均驻点总传热值为 140 ± 7% W/m2，与预测值非常吻合。实验测量的传热结果与许多对流加热相关性具有 5% 到 15% 的良好一致性，证实对流在隧道加热环境中占主导地位，并且可以在弱耦合辐射流中进行有用的实验测量
Stagnation-point total heat transfer was measured on a 1:27.7 model of the Flight Investigation of Reentry Environment II flight vehicle. Experiments were performed in the X1 expansion tube at an equivalent flight velocity and static enthalpy of 11 km/s and 12.7 MJ/kg, respectively. Conditions were chosen to replicate the flight condition at a total flight time of 1639.5 s, where radiation contributed an estimated 17-36% of the total heat transfer. This contribution is theorized to reduce to <2% in the scaled experiments, and the heating environment on the test model was expected to be dominated by convection. A correlation between reported flight heating rates and expected experimental heating, referred to as the reduced flight value, was developed to predict the level of heating expected on the test model. At the given flow conditions, the reduced flight value was calculated to be 150 MW/m2. Average stagnation-point total heat transfer was measured to be 140 ± 7% W/m2, showing good agreement with the predicted value. Experimentally measured heat transfer was found to have good agreement of between 5 and 15% with a number of convective heating correlations, confirming that convection dominates the tunnel heating environment, and that useful experimental measurements could be made in weakly coupled radiating flow