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Computational Modeling of Meteor-Generated Ground Pressure Signatures

机译:流星产生的地压特征的计算模型

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We present a thorough validation of a computational approach to predict infrasonic signatures of centimeter-sized meteoroids. We assume that the energy deposition along the meteor trail is dominated by atmospheric drag and simulate the steady, inviscid flow of air in thermochemical equilibrium to compute the meteoroid's near-body pressure signature. This signature is then propagated through a stratified and windy atmosphere to the ground using a methodology adapted from aircraft sonic-boom analysis. An assessment of the numerical accuracy of the nearfield and the farfield solver is presented. The results show that when the source of the signature is the cylindrical Mach-cone, the simulations closely match the observations. The prediction of the shock rise-time, the zero-peak amplitude of the waveform, and the duration of the positive pressure phase are consistently within 10% of the measurements. Uncertainty in the shape of the meteoroid results in a poorer prediction of the trailing part of the waveform. Overall, our results independently verify energy deposition estimates deduced from optical observations.
机译:我们提出了一种计算方法的全面验证,以预测厘米级流星体的次声特征。我们假设流星路径上的能量沉积主要受大气阻力的影响,并模拟热化学平衡条件下稳定,不粘稠的空气流动,以计算流星体的近体压力特征。然后使用航空器声波分析方法改编的方法,通过分层的大风大气将该特征传播到地面。对近场和远场求解器的数值精度进行了评估。结果表明,当签名的来源是圆柱马赫锥时,模拟结果与观测值非常吻合。冲击上升时间,波形的零峰值幅度以及正压阶段的持续时间的预测始终在测量值的10%之内。流星体形状的不确定性会导致波形尾部的预测效果较差。总体而言,我们的结果独立验证了从光学观测推导出的能量沉积估算。

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