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Prediction of Acoustic Loads on a Launch Vehicle Fairing During Liftoff

机译:运载火箭整流罩升空过程中的声载荷预测

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During liftoff of a launch vehicle, the acoustic pressure fluctuations caused by the engine exhaust gases produce high noise levels inside the fairing cavity and can damage the payload. Work presented in this paper investigates the nature of the external acoustic pressure distribution, in the frequency range from 50 to 400 Hz, on the fairing of a launch vehicle during liftoff. The acoustic pressure acting on a representative small launch vehicle fairing was estimated from the complex acoustic field generated by the rocket exhaust during liftoff. The estimation procedure involved the use of a unique source allocation technique which considered acoustic sources along the rocket engine exhaust flow. Numerical and analytical results for the acoustic loads on the fairing agree well.
机译:在运载火箭升空期间,由发动机废气引起的声压波动会在整流罩腔内产生高噪声水平,并可能损坏有效载荷。本文提出的工作研究了在升空过程中运载火箭的整流罩在50至400 Hz频率范围内的外部声压分布的性质。根据升空过程中火箭废气产生的复声场估算作用在代表性小型运载工具整流罩上的声压。估算程序涉及使用独特的声源分配技术,该技术考虑了沿火箭发动机排气流的声源。整流罩上的声载荷的数值和分析结果非常吻合。

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