Masahiro FUJIWARA, Keisho ITO, Shun Dylan IZUMA, Honami TOYAMA, Shuto YATSUYANAGI, Hideyuki TANNO

DOI Number: 10.60853/v0nq-2g47

Conference number: HiSST-2024-00196

Disturbances in the test free stream of the free piston-driven expansion tube (HEK-X) were measured at JAXA’s Kakuda Space Center as part of the facility calibration. These measurements were made at very high orbital velocities ranging from 8.5 km/s to 11 km/s. A focused laser differential interferometer (FLDI) with high-frequency response characteristics was used to enable measurements with extremely short test times of a few hundred microseconds. The Hayabusa sample return capsule model (20% scaled model) was used as the test model, and density disturbances inside the shock layer near the stagnation point were measured with FLDI and pressure disturbances were measured with a piezoelectric pressure transducer at the model stagnation point, and the frequency characteristics of FLDI and stagnation point pressure were investigated from their time histories. Because the test duration was short (a few hundred microseconds), a spectral analysis method called SWT (Synchrosqueezed Wavelet Transforms) was employed to investigate the time-frequency analysis. This technique allowed both frequency and time to be analyzed with high resolution. A cross-spectrum analysis of the two measurements was also performed. The analysis confirmed that some characteristic frequency mode disturbances appeared after the arrival of the backward expansion wave.

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In Categories: 1.Events, HiSST 2024, Testing & Evaluation
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