大宽高比矩形喷管的射流与外流掺混特性的数值研究
Numerical Study of Internal and External Flow Mixing for Rectangular Nozzles with Large Aspect Ratio
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摘要: 用数值计算的方法 ,研究了宽高比分别为 1 ,4,8,1 2和 1 6的矩形喷管射流与外流的掺混特性 ,并与等面积的轴对称喷管进行了比较。研究表明 ,矩形喷管与轴对称喷管相比 ,射流核心区长度较短 ,射流中心线上速度和温度衰减较快 ,掺混明显强于轴对称喷管 ,并且随着宽高比的增加 ,这种趋势是逐渐增强的Abstract: The mixing characteristics of external flow with jets from five rectangular nozzles with aspect ratio of 1,4,8,12,16 and from an axisymmetric nozzle were studied numerically.All nozzles studied had equal exit area.The results show that the rectangular nozzles lead to a relatively shorter jet core region and faster velocity and temperature decay rate than the axisymmetric one on centerline.This trend increases with the increase of aspect ratio.
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Key words:
- aerospace propulsion system /
- rectangular nozzle /
- axisymmetric nozzle /
- aspect ratio /
- mixing
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