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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >PRESSURE FLUCTUATIONS IN THE BASE OF A TYPICAL RE-ENTRY MODULE
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PRESSURE FLUCTUATIONS IN THE BASE OF A TYPICAL RE-ENTRY MODULE

机译：典型的重新进入模块中的压力波动

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摘要

Unsteady pressure measurements were carried out on the flow side and around the base of a blunt-nosed bluff body representing a spacecraft re-entry module in the Mach number range of 0.8 to 4.0. The results show that the pressure fluctuations in the base region are much higher than in the attached flow region of the body. Most of the energy in the pressure fluctuations in the base region is in the low-frequency band, while fluctuations in the attached flow region occur over a wider bandwidth. In the separated flow region at the base, highest pressure fluctuations were observed around the rear stagnation point. The frequency spectra do not show any dominant tone attributable to the configuration at any measurement location. The observations suggest that vortex shedding behind such 3-d bluff bodies could be relatively weak and that most of the fluctuating energy in the separated flow region could be due to random oscillations of the rear stagnation point.
机译：在流动侧以及在代表马赫数范围为0.8到4.0的航天器再进入组件的钝鼻状钝体的底部周围进行了非定常压力测量。结果表明，基部区域的压力波动远高于人体附着的流动区域。基本区域中压力波动中的大部分能量都在低频频带中，而附加流动区域中的波动则发生在更宽的带宽上。在底部的分离流动区域中，在后停滞点附近观察到最大压力波动。频谱在任何测量位置均未显示可归因于配置的任何主导音调。这些观察结果表明，在这种3-d钝器体后方的涡流散发可能相对较弱，并且在分离的流动区域中的大部分波动能量可能是由于后停滞点的随机振动引起的。

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    G.K. Suryanarayana; Rajan Kumar; A.E. Sivaramakrishnan; V.R. Ganesan;

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    Aerospace Engineering Dayananda Sagar University Bangalore-560 068 India;

    FAMU-FSU College of Engineering Florida State University Tallahassee FL U S A;

    Scientist (Former) Vikram Sarabhai Space Centre (VSSC) Department of Space ISRO Post Thiruvananthapauram-695 022 India;

    Scientist/Engineer Vikram Sarabhai Space Centre (VSSC) Department of Space ISRO Post Thiruvananthapauram-695 022 India;

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