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首页> 美国政府科技报告 >Oscillations in a Forward-Facing Cavity Measured Using Laser- Differential Interferometry in a Hypersonic Quiet Tunnel
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Oscillations in a Forward-Facing Cavity Measured Using Laser- Differential Interferometry in a Hypersonic Quiet Tunnel

机译：在高超声速静音隧道中使用激光差分干涉测量法测量前向腔中的振荡

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Laminar-turbulent transition is a pivotal factor for the design of hypersonic vehicles but the mechanisms that induce transition are not well understood. A laser differential interferometer (LDI) is a non-intrusive optical device that measures the optical path length difference between two laser beams. The LDI is a reliable calibrated instrument to assist the study of boundary layer instability-wave growth in hypersonic flow and has high sensitivity and frequency response. An LDI with a commercial balanced photodetector capable of detecting optical path length differences of lambda/21, 000 from DC to 80 MHz was assembled and tested in the Purdue Quiet-Flow Ludwieg tube. Fluctuations in the subsonic region of a forward-facing cavity were measured with the LDI and compared to those detected with a Kulite pressure transducer at the base of the cavity. Predictions of self-resonating deep cavities were confirmed. The LDI was then adapted and transferred to the Boeing/AFOSR Mach-6 Quiet Tunnel.

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