Research on the double-inlet test method in low speed wind tunnel
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摘要: 为在4 m量级低速风洞中开展双发进气道试验，在中国空气动力研究与发展中心低速空气动力研究所4 m × 3 m风洞中建立了一种双发进气道试验方法：模型采用单支杆方式支撑，以两路独立的引射器和数字式调压阀系统实现双发进气道的流量模拟与控制。模型迎角范围−10°～90°，侧滑角范围−45°～45°，最大模拟流量分别为2.9 kg/s和1.4 kg/s。采用该方法完成了一期双发进气道低速试验，试验结果表明：模型受管路气动影响小；独立的模型和引射器支撑机构适应各种模型支撑要求；双发流量模拟和控制完全独立，满足开展双发进气道相互影响试验的需求。Abstract: In order to meet the requirement of the double-inlet test in the 4 m magnitude low speed wind tunnel, a test method of the double-inlet test in the 4 m × 3 m low speed wind tunnel of LSAI of CARDC was proposed. According to the method, a model is supported by one pole, and each inlet mass flow is simulated and controlled by an ejector with a digital pressure regulating valves system. In this method, the range of AOA is −10°～90°, the range of AOS is −45°～45°, the simulating maximum of the double-inlet mass flow is 2.9 kg/s and 1.4 kg/s. To validate the method, a double-inlet test was completed in the low speed wind tunnel. The test results show: the model is less affected by pipeline aerodynamics. The independent model and ejector support mechanism meets various model support requirements. Double inlets mass flow simulation and control are completely independent, which meets the requirement of studying interactions for double inlets.
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图 10 Ma=0时双发进气道出口总压云图比较（逆航向）
Fig. 10 Total pressure distribution of the double-inlet exits
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图 9 左进气道固定流量下的右进气道特性曲线
Fig. 9 The characteristic curves of right inlet with different mass flows of the left inlet
表 1 进气道σ匹配特性
Table 1 Inlet characteristics of matching σ parameter
Ma 左进气道匹配σ 右进气道匹配σ 试验值 计算值 差量 试验值 计算值 差量 0 0.926 0.918 0.9% 0.927 0.918 1.0% 0.1 0.946 0.940 0.6% 0.946 0.940 0.6% 0.2 0.960 0.956 0.4% 0.961 0.956 0.5% 
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