Disturbance Level Characterization of a Hypersonic Blowdown Facility
Disturbance Level Characterization of a Hypersonic Blowdown Facility
复制标题
高超声速排污设施的干扰水平表征
DOI：
10.2514/1.j051502
复制
发表时间：
2012
期刊：
影响因子：
2.5
通讯作者：
M. Carbonaro
中科院分区：
文献类型：
--
作者：
D. Masutti;E. Spinosa;O. Chazot;M. Carbonaro
自由流扰动对边界层的稳定性和转捩起着决定性的作用，特别是在高速流动中。因此，风洞中气流质量的评估是一个关键问题，特别是在过渡到湍流研究中。为此目的，采用经典的侵入式测量技术（热线风速仪和皮托管压力探头），对VKI H3马赫6风洞在不同雷诺数下的自由流扰动水平进行了详细的表征。有关探头的气动加热的问题进行了调查，并开发了一种特殊的校准技术，以补偿这些效应。统计和频谱分析进行了比较，在文献中提供的数据为其他高超声速风洞，在类似的马赫数和雷诺数范围内工作。还开发了一种组合数据简化技术，该技术允许从通过上述仪器可直接测量的数据中提取所有流量波动。通过这种技术，可以验证一些物理假设的正确性。此外，Kovasznay模态分析允许表征扰动的起源。
Free-stream disturbances have a dominant role on boundary layer stability and transition, especially in high speed ows. The assessment of the ow quality in a wind tunnel is therefore a key issue especially in transition to turbulence studies. With this purpose a detailed characterization of the free-stream disturbance level of the VKI H3 Mach 6 Wind Tunnel at di erent Reynolds number is carried out by means of classical intrusive measurements techniques (hot-wire anemometry and Pitot pressure probes). Issues concerning the aerodynamic heating of the probes are investigated and a special calibration technique is developed in order to compensate for these e ects. Statistical and spectral analyses are compared with the data available in the literature for other hypersonic wind tunnels, working at similar ranges of Mach and Reynolds numbers. A combined data reduction technique is also developed which allows to extract all ow quantities uctuations from those directly measurable through the above-mentioned instrumentations. By means of this technique, the validity of some physical hypotheses on the ow can be veri ed. Moreover, a Kovasznay modal analysis allows to characterize the origin of the disturbances.