Research of simulation method for inlet flow steady-state distortion based on momentum exchange
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摘要: 为高效快速地模拟稳态总压畸变，基于气流动量交换机理开展了畸变生成方法研究。建立了流场稳态总压畸变控制模型，研制了该型畸变发生器技术验证机，搭建地面畸变模拟试验台，在地面演示验证生成了3个典型构型稳态总压畸变流场，模拟误差为2.7%～5.2%。试验研究表明：基于动量交换机理的空气喷流式畸变发生器直接面向流场构型生成期望的稳态总压畸变，能通过“软调节”控制主流区喷射流位置及大小，快速模拟任意流场畸变，成本低，具有工程使用价值。Abstract: In order to simulate the steady-state total pressure distortion at the inlet of aero-engine, a new distortion generation method is studied and validated. After establishing the control model of steady state total pressure distortion generation in flow field, the distortion generator technical verification machine is developed, and the ground distortion simulation test-bed is built. Using it, three typical flow fields in different configuration of steady state total pressure distortion have generated demonstratively, and the simulation error is between 2.7% to 5.2%. The experimental results show that: The air jet distortion generator based on the airflow momentum exchange mechanism generates the expected steady-state total pressure distortion directly to flow field configuration, which can rapidly realize arbitrary flow field distortion by controlling the position and mass of the jet flow in the mainstream area by “soft adjustment”, and with low cost. It has obvious advantages and engineering practical value.
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图 2 空气喷流式总压畸变发生器工作原理
Figure 2. The work principle of air jet total pressure distortion generator
图 6 测量截面上压力探针分布示意图
Figure 6. The project of pressure probe distributing at the measuring cross section
图 7 10°迎角流场生成过程中典型流场
Figure 7. Typical flow field in the process of generating 10 degree angle of attack flow field
图 8 10°迎角流场生成过程中畸变构型误差变化
Figure 8. Variation of distortion configuration error during the formation of 10 degree angle of attack flow field
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