MF-1模型飞行试验表面压力与温度测量技术研究

Surface pressure and temperature measurement technology in MF-1 modelling flight test

  • 摘要: MF-1是我国首次以高超声速空气动力学基础问题研究为目的的航天模型飞行试验,试验模型为锥-柱-裙体,主要研究0°迎角圆锥边界层转捩和压缩拐角激波/边界层干扰现象。针对飞行试验转捩区测量需求,引入和改进了风洞试验中常用薄壁测热技术,设计了一种新型变厚度薄壁测温结构,有效抑制了侧向导热损失,可基于一维热流辨识方法获取可靠的表面热流数据;与现有风洞试验薄壁测热技术相比,该方法可提高有效测量时间,降低时间延迟效应,适于长时间飞行试验测量。针对柱-裙压缩拐角激波/边界层干扰区压力测量需求,采用了风洞试验中常用的基于引压管和电子压力扫描阀的测量方案,通过改进装配工艺,提高了系统耐压能力,实现了模型飞行试验全弹道表面压力测量。模型飞行试验结果表明:MF-1模型飞行试验测量系统可靠,获得了可供边界层转捩和激波/边界层干扰研究分析及CFD验证的可信数据;在热流急剧下降时一维热流辨识存在较大误差,以及压力测量中的时间延迟和低压测量准确度存在不足,是需要进一步改进的问题。

     

    Abstract: For the fundamental studiesin hypersonic aerodynamics, the first aerospace modeling flight named MF-1 was carried out in China.The tested model is a cone-cylinder-flare configuration in the payload modules of this flight, and the main objective of this test is the investigation of the boundary layer transitionon the cone surface and the shock wave/boundary layer interaction at the compression corner.According to the measurement requirements of the boundary layer transition study, the common thin-skin calorimeter design in wind tunnel tests was employed and modified.This modification led to a novel variable-thickness thin-skin temperature measurement structure.The variable-thickness thin-skin structure depresses effectively lateral heat conduction losses due to the temperature difference between thin-skin and surrounding shell during long-time flight, therefore an effective long time measurement was obtained.Heat flux data can be obtained using an one dimensional heat flux identification method based on variable-thickness thin-skin flight data.This method improves the response time in comparison with the thin-skin calorimetric method.A pressure measurement scheme based on pneumatic tubes and an electric pressure scanner was designed for the shock wave/boundary layer interaction study at the ompression corner of the cylinder-flare modules.The fabrication process of the pneumatic tubes was modified to improve its pressure tight capability.The parameter measurement system was proved reliable by the MF-1 flight test.The thin-skin temperature and surface pressure data of the whole trajectory were obtained, which can be used for relevant analysis and CFD verification in boundary layer transition and shock wave/boundary layer interaction study.However, we need to improve some deficiencies in the test including the significant errors in 1D heat flux identification during steep drop of the heat flux, the response delay, and accuracy in low-pressure measurement.

     

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