本文選題：Richtmyer-Meshkov不穩(wěn)定性 + 二次沖擊　； 參考：《高壓物理學(xué)報(bào)》2016年06期

【摘要】：采用粒子圖像測(cè)速(PIV)技術(shù),實(shí)驗(yàn)研究了激波兩次沖擊空氣環(huán)境中重氣體SF6氣柱的Richtmyer-Meshkov(RM)不穩(wěn)定性,定量表征了流場(chǎng)的速度、渦量和環(huán)量。結(jié)果表明,激波首次沖擊氣柱后,界面演化成初始渦對(duì),且在較長(zhǎng)時(shí)間內(nèi)渦強(qiáng)度的變化很小。激波二次沖擊氣柱后:當(dāng)反射距離較小時(shí),界面衍生出二次渦對(duì),其旋轉(zhuǎn)方向與初始渦對(duì)的旋轉(zhuǎn)方向相反,強(qiáng)度顯著小于初始渦對(duì)的強(qiáng)度;當(dāng)反射距離較大時(shí),則不衍生大尺度渦結(jié)構(gòu)。初始渦對(duì)的環(huán)量在激波二次沖擊氣柱后隨時(shí)間逐漸減小,說(shuō)明能量逐漸由流場(chǎng)中的大尺度結(jié)構(gòu)轉(zhuǎn)移至小尺度結(jié)構(gòu)。利用PIV技術(shù)得到的初始渦對(duì)和二次渦對(duì)的環(huán)量與理論模型的預(yù)測(cè)結(jié)果吻合較好。
[Abstract]:The Richtmyer-Meshkov (RM) instability of a heavy gas SF _ 6 gas column in a two-shock impact air environment was experimentally studied by particle image velocimetry (PIV) technique. The velocity, vorticity and annulus of the flow field were quantitatively characterized. The results show that the interface evolves into an initial vortex pair after the shock wave hits the gas column for the first time, and the variation of the vorticity intensity is very small in a long period of time. When the reflection distance is small, the secondary vortex pair is derived from the interface. The rotation direction of the secondary vortex pair is opposite to that of the initial vortex pair, and the intensity of the initial vortex pair is significantly lower than that of the initial vortex pair, and when the reflection distance is large, The large scale vortex structure is not derived. The annulus of the initial vortex pair decreases with time after the shock wave impinges on the gas column, indicating that the energy is gradually transferred from the large scale structure in the flow field to the small scale structure. The initial vortex pair and the secondary vortex pair obtained by the PIV technique are in good agreement with the predicted results of the theoretical model.
【作者單位】： 中國(guó)工程物理研究院流體物理研究所沖擊波物理與爆轟物理實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(11172278,11472253,11302201) 中國(guó)工程物理研究院科學(xué)技術(shù)發(fā)展基金(2014B0201017)
【分類號(hào)】：O354.5

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