小间距单孔冲击凸面靶板流场结构实验

毛军逵; 刘震雄; 郭文

小间距单孔冲击凸面靶板流场结构实验

1.
南京航空航天大学能源与动力学院, 南京 210016
2.
中国燃气涡轮研究院涡轮室, 成都 610500

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出版历程
- 收稿日期: 2006-10-19
- 修回日期: 2007-01-29
- 刊出日期: 2007-10-28

Experimental investigations on round jet impingement on flow structures of convex surface target with narrow space

1.
College of Energy and Power Engineering, Nanjing University ofAeronautics and Astronautics, Nanjing 210016, China
2.
China Gas Turbine Estabshment, Chengdu 610500, China

摘要

摘要: 利用烟线法研究了小间距、单孔冲击凸面靶板的流场结构.实验中,改变冲击雷诺数Re、冲击间距和冲击孔直径之比H/d以及冲击靶面相对曲率d/D等参数,通过拍摄流场形态,分析气流分离角度和涡旋结构随上述参数的变化规律.研究结果表明当Re,H/d较大时,在凸面靶板周向两侧形成了稳定的旋流结构.随着Re,H/d的增加,冲击射流与靶面分离处对应的圆心角增大,分离推迟.实验中还发现当d/D减小,流体与靶面的分离提前,其相对应的圆心角呈现减小的趋势.
- 航空、航天推进系统 /
- 冲击 /
- 凸面 /
- 流场显现 /
- 旋流结构 /
- 小空间
Abstract: The flow structure of convex surface target with narrow space under round jet impingement was investigated by smoke wire flow visualization.Reynolds number Re(750-1500), the ratio of the jet impingement distance to the diameter of the jet hole H/d(0.2-1), and the relative curvature d/D were modified in this experiment.The changes of flow separation angle and vortex dependently of above-specified parameters were analyzed through capture of flow field state.The results shows that, when Re, H/D are larger, a stable vortex is generated at two sides of the convex surface.With the increase of Re and H/D, the air separation is delayed when the radius angle of jet flow corresponding to surface separation increases.It was also observed in the experiment that the separation was caused in advance and the corresponding radius angle decreased when d/D declined.
- aerospace propulsion system /
- jet impingement /
- convex surface /
- flow visualization /
- swirl structure /
- narrow space

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参考文献(10)

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