【摘要】：激波沖擊雙氣柱既包含了激波與界面的相互作用又包含了界面之間的相互作用,是探索實(shí)際應(yīng)用中Richtmyer-Meshkov(RM)不穩(wěn)定性演化的很好的橋梁.利用高分辨率的粒子圖像測(cè)速(PIV)技術(shù)獲得了4種不同初始中心間距的雙橢圓氣柱在平面激波沖擊下的速度場(chǎng)、渦量場(chǎng)和環(huán)量,定量表征了界面相互作用對(duì)RM不穩(wěn)定性演化的影響.界面相互作用較弱時(shí),雙橢圓氣柱的演化由兩對(duì)渦對(duì)結(jié)構(gòu)主導(dǎo),內(nèi)渦弱于外渦,且隨著中心間距的減小內(nèi)渦的弱化愈加顯著;界面相互作用較強(qiáng)時(shí),雙橢圓氣柱演化模式發(fā)生轉(zhuǎn)變,內(nèi)渦消失,只由一對(duì)渦對(duì)結(jié)構(gòu)主導(dǎo),外渦隨中心間距的減小而增強(qiáng).界面相互作用導(dǎo)致雙橢圓氣柱的演化行為與單橢圓氣柱的演化行為不同,典型的特征是內(nèi)渦的削弱及渦對(duì)結(jié)構(gòu)的旋轉(zhuǎn)運(yùn)動(dòng).雙橢圓氣柱演化行為與雙圓氣柱演化行為也存在差別,表現(xiàn)為強(qiáng)界面相互作用時(shí)外渦隨中心間距的減小而增強(qiáng).
[Abstract]:The shock double gas column contains both the interaction between shock wave and interface and the interaction between interface. It is a good bridge to explore the evolution of Richtmyer-Meshkov (RM) instability in practical applications. High resolution particle image velocimetry (PIV) technique is used to obtain the velocity field, vorticity field and annulus of four kinds of double elliptical gas cylinders with different initial center spacing under the impact of plane shock wave. The influence of interfacial interaction on the evolution of RM instability was quantitatively characterized. When the interface interaction is weak, the evolution of the double elliptical gas column is dominated by two pairs of vortices, and the internal vortex is weaker than the external vortex, and the weakening of the internal vortex becomes more obvious with the decrease of the center distance, while the interaction between the two ellipses is stronger than that of the external vortex. The evolutional model of the double elliptical gas column changes and the internal vortex disappears, only a pair of vortices dominate the structure, and the outer vortex increases with the decrease of the center distance. The evolution behavior of double elliptical gas column is different from that of single elliptical gas column due to the interfacial interaction. The typical characteristics are the weakening of internal vortex and the rotating motion of vortex to the structure. The evolution behavior of double elliptical gas column is also different from that of double circular gas column, which shows that the external vortex increases with the decrease of center spacing when the interface is strong.
【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國(guó)防科技重點(diǎn)實(shí)驗(yàn)室;浙江理工大學(xué)機(jī)械與自動(dòng)控制學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):11172278,11472253,11302201) 中國(guó)工程物理研究院科學(xué)技術(shù)發(fā)展基金(編號(hào):2014B0201017)資助項(xiàng)目
【分類號(hào)】：O354.5

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