Research on method for evaluating the thermal protective performance of non-catalysis material in non-equilibrium flow
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摘要: 针对电弧风洞试验条件下非催化壁防热材料在非平衡流场中存在的防热性能"欠考核"问题，提出了有效考核方法。以典型陶瓷基复合材料尖劈外形试件为例，采用CFD数值模拟与试验状态调试相结合的方法，对典型电弧风洞试验条件下完全催化壁和非催化壁材料的热流进行了数值模拟，并结合热流实测结果，确定了风洞试验状态并完成了试验，实现了对该类热防护材料防热性能的有效考核，为非催化壁材料防热性能试验"欠考核"问题提供了解决途径。Abstract: In this paper, an effective wind tunnel test method is presented for evaluating the thermal protective performance of the non-catalysis material. The method is proved to be reasonable by iterating the results between CFD simulation and the wind tunnel operating parameter, taking a typical CMC(ceramic matrix composite) wedge-edge specimen for example. The operating parameters of the arc tunnel was determined by comparing the simulation results of the non-catalysis and the full-catalysis assumption. The wind tunnel test results indicate that the test on the specimen was performed as expected, which may be helpful to solve the 'under-evaluating' problem for the non-catalysis material in the non-equilibrium flow.
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图 1 非催化壁材料防热性能考核试验参数设计流程
Fig. 1 Test steps for evaluating the thermal protective performance of non-catalysis material
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图 3 喷管对称面流场参数分布
Fig. 3 Flow parameters distribution on the plane of symmetry of the nozzle
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图 5 前缘试验件绕流对称面流场分布
Fig. 5 Flowparameters distribution on the plane of symmetry of the wedge-edge specimen
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图 6 前缘试验件表面热流和压力分布(完全催化条件)
Fig. 6 Heat flux andpressure distribution of the wedge-edge specimen (Full catalysis)
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图 7 试验件表面热流分布
Fig. 7 Heat flux distribution of CFD simulation results with full-catalysis and non-catalysis assumption
表 1 目标试验状态
Table 1 The expected test condition
状态 目标热流/(W·m-2) 目标焓值/(J·kg-1) 1 1.7×106 16×106 
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表 2 试验状态调试参数
Table 2 The operating parameters of actual test
状态 弧室压力/Pa 总焓/(J·kg-1) 1 2.65×105 18.5×106
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表 3 CFD模拟喷管出口参数
Table 3 Tunnel exit parameters of CFD simulation
Ma 静温T/K 静压p/Pa CO CN CN2 CO2 CNO CNO+ Ce 5.69 1545.14 710.05 0.1436 0.2438 0.6126 0 0 0 0 注：Ci为7组分空气化学模型中各组分的质量比数
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表 4 试验测试与目标热流
Table 4 Comparison of heat flux between test and expected data
完全催化壁(CFD)/(W·m-2) 完全非催化壁(CFD)/(W·m-2) 实测热流/(W·m-2) 目标热流/(W·m-2) 2.718×106 1.603×106 2.57×106 1.7×106
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