【摘要】：在水平激波管中,采用平面激光誘發(fā)熒光(planar laser-induced fluorescence,PLIF)方法對橢圓形重氣柱界面的Richtmyer-Meshkov不穩(wěn)定性進行實驗。氣柱由SF6混入一定比例的丙酮蒸氣構成,環(huán)境氣體為空氣。通過改變橢圓形氣柱的長短軸比值,得到了激波馬赫數(shù)為1.25時,3種初始界面的演化形態(tài)。通過相對體積分數(shù)標定,得到了界面失穩(wěn)演化過程中的相對體積分數(shù)分布,觀察到了激波作用后界面氣體聚集、轉(zhuǎn)移、消散等現(xiàn)象。實驗結(jié)果發(fā)現(xiàn),對于流向軸長與展向軸長之比較大的氣柱界面,初始界面產(chǎn)生的渦量更大且分布更廣,其界面不穩(wěn)定性發(fā)展得越迅速和劇烈。失穩(wěn)發(fā)展迅速的界面甚至出現(xiàn)渦對碰撞并產(chǎn)生尾部射流結(jié)構的現(xiàn)象。初始界面直接決定了失穩(wěn)發(fā)展初期形成的渦對強度和間距,并對后期演化有重要影響。
[Abstract]:In a horizontal shock tube, the Richtmyer-Meshkov instability at the interface of an elliptical heavy gas column was investigated by planar laser-induced fluorescence (PLIF) method. The gas column consists of a certain proportion of acetone vapor mixed with SF6, and the ambient gas is air. By changing the ratio of the long and short axis of the elliptical gas column, the evolution of three initial interfaces is obtained when the Mach number of shock wave is 1.25. Through the relative volume fraction calibration, the relative volume fraction distribution in the evolution process of interface instability is obtained, and the phenomena of gas accumulation, transfer and dissipation at the interface after shock wave action are observed. The experimental results show that the vorticity generated by the initial interface is larger and more widely distributed, and the instability of the interface develops more rapidly and intensely for the gas-column interface where the axial length of the flow direction is larger than that of the spanned axial length. The unstable interface even appears the phenomenon of vortex-pair collision and the structure of the tail jet. The initial interface directly determines the strength and spacing of the vortices formed in the initial stage of instability development, and has an important effect on the later evolution.
【作者單位】： 中國工程物理研究院流體物理研究所沖擊波物理與爆轟物理重點實驗室;
【基金】：國家自然科學基金項目(11172278,11302201,11472253)
【分類號】：O354.5

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1 張曉航;S.Simoёns;;粘性和溫度對PLIF測量濃度場的影響[A];第八屆全國實驗流體力學學術會議論文集[C];2010年

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