【摘要】：高速列車以大于300km/h的速度穿越隧道時,在隧道出口形成的微氣壓波具有較強(qiáng)的非線性。該微氣壓波幅值的數(shù)量級達(dá)到102 Pa,難以用傳統(tǒng)的CFD方法(2階精度)精確模擬�；诟唠A譜差分的CAA模型是一種值得嘗試的方法。CAA方法能在強(qiáng)非線性區(qū)域保持流體變量和聲學(xué)變量的傳遞精度,高階譜差分方法能夠融入非結(jié)構(gòu)網(wǎng)格,獲得較高的計算效率和幾何靈活性。本文在動模型試驗(yàn)平臺開展200~350km/h速度下的微氣壓波縮比試驗(yàn)研究;采用基于3階譜差分的CAA方法,對軸對稱圓管模型,數(shù)值研究了管口氣壓爆波的產(chǎn)生和近場輻射特性。數(shù)值結(jié)果和縮比試驗(yàn)結(jié)果的一致性,驗(yàn)證了該數(shù)值方法的準(zhǔn)確性和可靠性。
[Abstract]:When a high-speed train passes through a tunnel at a speed greater than 300km/h, the microbaric waves formed at the exit of the tunnel have strong nonlinearity. The order of magnitude of the amplitude of the microbaric wave is 102 Pa, which is difficult to be accurately simulated by the traditional CFD method (2 order accuracy). The CAA model based on high-order spectral difference is a method worth trying. The CAA method can maintain the transfer accuracy of fluid and acoustic variables in strongly nonlinear regions, and the high-order spectral difference method can be incorporated into unstructured meshes. High computational efficiency and geometric flexibility are obtained. In this paper, the microbaric wave shrinkage test at 200~350km/h velocity is carried out on the dynamic model test platform, and the generation and near-field radiation characteristics of the barometric detonation wave at the nozzle are numerically studied by using the CAA method based on the third-order spectral difference for the axisymmetric circular tube model. The accuracy and reliability of the numerical method are verified by the agreement between the numerical results and the experimental results.
【作者單位】： 中南大學(xué)軌道交通安全教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(51005249,U1134203)
【分類號】：U451.3
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本文編號：2219149