Abstract: Experimental research for four mixing tubes with different sectional area and different axial distance for a axisymmetric lobed nozzle was conducted to investigate the effect of area ratio A m/ A p and axial distance L mp between lobed nozzle and mixing tube on the aerodynamic performances for a lobed exhaust system. The results show that the pumping coefficient increase and synthetic aerodynamic performance of the system can be improved with the increase of A m/ A p.The pumping coefficient and pressure loss coefficient of the system also increase with L mp increase.The slope of pressure loss coefficient with L mp change is different in different range, and the synthetic aerodynamic performance be worse with L mp increase.

Key words: Engine nozzle;Exhaust ejector system;Aerodynamic performance

摘要： 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。

关键词: 发动机喷管;排气引射系统;气动性能