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通过对一个轴对称波瓣主喷管与 4种不同截面积的圆形混合管、并分别在不同轴向位置时的组合试验 ,研究了混合管与主喷管截面积之比Am/Ap 及轴向间距Lmp对排气引射系统的引射系数、压力损失系数和气动性能综合参数等的影响。结果表明 :在试验范围内 ,Am/Ap 增大 ,系统的引射系数增大、综合气动性能改善 ;Lmp增大 ,系统的引射系数和压力损失系数也增大。对于不同范围 ,压力损失系数增加的斜率不同 ,总的趋势则是综合气动性能变坏。
Through the combination test of an axial symmetrical lobe main nozzle and four kinds of circular mixing tubes with different cross-sectional areas and different axial positions respectively, the ratio Am / Ap of the cross-sectional area of the mixing tube to the main nozzle and Axial distance Lmp on the exhaust injection system ejector coefficient, pressure loss coefficient and aerodynamic performance of the integrated parameters. The results show that Am / Ap increases, the emissivity of the system increases, and the comprehensive aerodynamic performance improves. The Lmp increases and the coefficient of emissivity and pressure loss of the system also increase. For different ranges, the slope of increase of pressure loss coefficient is different, and the general trend is that the comprehensive aerodynamic performance deteriorates.