尖劈障碍物对射流扩散流场影响
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摘要
为了研究障碍物形状对射流流场影响,本文对尖劈障碍物受限射流流场进行了数值模拟,通过改变轴对称尖劈障碍物冲击角度和冲击长度来分析流场速度和压力分布情况。结果表明冲击尖劈障碍物的受限射流流场可以分为自由射流段、冲击射流段和壁面射流段;随着冲击角度增加,被分流两股流体不再汇合,壁面射流段变得明显;随着冲击长度增加,障碍物后端等于大气压段冲击长度增加,使得后端平行与冲击面射流流体长度增长,射流变得稳定。
In order to study the influence of different shape obstacles on jet flow field, the property and stability of its flow field is studied by simulation in this paper. The distributing of velocity and pressure in the flow field is analyzed by changing the angle and the length of the axisymmetric obstacles. The results have shown that the flow field of the confined jet in this paper can be broken down into three pieces: free jet, impact jet, and wall jet. The split-flow divided by the obstacle can not converge together along with the obstacle angle increasing and the appearance of the wall jet become obvious. the length of the force on the obstacle equal to the barometric pressure is increasing by the obstacle length and the property of the jet become more stable.
In order to study the influence of different shape obstacles on jet flow field, the property and stability of its flow field is studied by simulation in this paper. The distributing of velocity and pressure in the flow field is analyzed by changing the angle and the length of the axisymmetric obstacles. The results have shown that the flow field of the confined jet in this paper can be broken down into three pieces: free jet, impact jet, and wall jet. The split-flow divided by the obstacle can not converge together along with the obstacle angle increasing and the appearance of the wall jet become obvious. the length of the force on the obstacle equal to the barometric pressure is increasing by the obstacle length and the property of the jet become more stable.
引文
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[4]冯喜平,赵胜海,李进贤,唐金兰.固体火箭发动机射流中存在障碍物时的流场分析[J].推进技术,2009,30(4):396-399.
[5]Rahimi M,Irani M.Experimental study of slot jet impingement heat transfer on a wedge-shaped surface[J].Heat and Mass Transfer,December,2012,48(12):2095-2101.
[6]朱昊明,赵平辉,陈义良.声激励下自由射流的涡量场[J].工程热物理学报,2012,33(10),1811-1814.
[7]Chen Y,Skokova K.Computational Analysis of ArcJet Wedge Tests Including Ablation and Shape Change[C].10th AIAA/ASME Joint Thermo physics and Heat Transfer Conference,Chicago,2010.
[2]葛其明,姚朝晖,何枫.超声速欠膨胀冲击射流流场振荡的数值模拟[J].推进技术,2004,25(1):7-10.
[3]陈庆光,徐忠,吴玉林,张永建.平面倾斜冲击射流场的数值分析[J].工程热物理学报,2005,26(2):237-239.
[4]冯喜平,赵胜海,李进贤,唐金兰.固体火箭发动机射流中存在障碍物时的流场分析[J].推进技术,2009,30(4):396-399.
[5]Rahimi M,Irani M.Experimental study of slot jet impingement heat transfer on a wedge-shaped surface[J].Heat and Mass Transfer,December,2012,48(12):2095-2101.
[6]朱昊明,赵平辉,陈义良.声激励下自由射流的涡量场[J].工程热物理学报,2012,33(10),1811-1814.
[7]Chen Y,Skokova K.Computational Analysis of ArcJet Wedge Tests Including Ablation and Shape Change[C].10th AIAA/ASME Joint Thermo physics and Heat Transfer Conference,Chicago,2010.