【摘要】：為了探索高溫高壓周向均布4股貼壁燃氣射流在受限空間中的擴展特性,設(shè)計了貼壁燃氣射流在圓柱形充液室內(nèi)擴展的實驗裝置,借助數(shù)字高速錄像系統(tǒng),觀察了4股貼壁燃氣射流在充液室中的擴展過程,發(fā)現(xiàn)由Kelvin-Helmholtz不穩(wěn)定性引起的表面不規(guī)則一直存在于整個射流擴展過程;通過處理拍攝記錄的射流擴展序列圖,獲得不同時刻射流擴展的軸向和徑向位移;對比了不同破膜噴射壓力和噴孔結(jié)構(gòu)參數(shù)對4股貼壁燃氣射流擴展過程的影響。實驗結(jié)果表明:噴孔面積越大,貼壁射流初期軸向擴展速度越大,但由于徑向擴展達到交匯的時間較早,湍流摻混和干涉強烈,衰減也越快;破膜噴射壓力越高,射流徑向擴展到達交匯的時間越短;破膜噴射壓力從12 MPa升高到20 MPa,射流軸向擴展速度大幅增加,氣液湍流摻混效應(yīng)增強。
[Abstract]:In order to explore the expansion characteristics of 4 strands of adherent gas jet in confined space at high temperature and high pressure, an experimental device was designed for the expansion of the gas jet in a cylindrical filling chamber, with the aid of a digital high speed video recording system. The propagation process of four gas jet strands in the filling chamber is observed. It is found that the surface irregularity caused by Kelvin-Helmholtz instability has always existed in the whole jet propagation process. The axial and radial displacements of jet propagation at different times were obtained, and the effects of different film breaking pressure and nozzle structure parameters on the propagation process of 4 strands of gas jet were compared. The experimental results show that the larger the area of the injection hole, the greater the axial propagation velocity of the adherent jet in the initial stage, but the earlier the radial expansion reaches the intersection time, the stronger the turbulent mixing and interference are, the faster the attenuation is, and the higher the film breaking pressure is. The shorter the time of radial expansion of jet to the intersection, the higher the jet pressure from 12 MPA to 20 MPA, the higher the axial velocity of jet, and the stronger the effect of gas-liquid turbulent mixing.
【作者單位】： 南京理工大學能源與動力工程學院;
【基金】：國家自然科學基金項目(11372139) 江蘇省普通高校研究生科研創(chuàng)新計劃項目(CXLX14_0396)
【分類號】：O358

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本文編號：2131621