圆柱形充液室中4股贴壁燃气射流扩展特性的实验研究
发布时间：2018-07-18 10:27
【摘要】：为了探索高温高压周向均布4股贴壁燃气射流在受限空间中的扩展特性,设计了贴壁燃气射流在圆柱形充液室内扩展的实验装置,借助数字高速录像系统,观察了4股贴壁燃气射流在充液室中的扩展过程,发现由Kelvin-Helmholtz不稳定性引起的表面不规则一直存在于整个射流扩展过程;通过处理拍摄记录的射流扩展序列图,获得不同时刻射流扩展的轴向和径向位移;对比了不同破膜喷射压力和喷孔结构参数对4股贴壁燃气射流扩展过程的影响。实验结果表明:喷孔面积越大,贴壁射流初期轴向扩展速度越大,但由于径向扩展达到交汇的时间较早,湍流掺混和干涉强烈,衰减也越快;破膜喷射压力越高,射流径向扩展到达交汇的时间越短;破膜喷射压力从12 MPa升高到20 MPa,射流轴向扩展速度大幅增加,气液湍流掺混效应增强。
[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.
【作者单位】： 南京理工大学能源与动力工程学院;
【基金】：国家自然科学基金项目(11372139) 江苏省普通高校研究生科研创新计划项目(CXLX14_0396)
【分类号】：O358
[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.
【作者单位】： 南京理工大学能源与动力工程学院;
【基金】：国家自然科学基金项目(11372139) 江苏省普通高校研究生科研创新计划项目(CXLX14_0396)
【分类号】：O358
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