二元波瓣喷管排气引射系统的试验研究

通过７种二元波瓣喷管排气引射系统的对比试验，研究了二元波瓣喷管的波瓣结构形状、排列方式和间距等参数对排气引射系统气动性能的影响。试验结果表明：错列二元波瓣喷管引射性能和强化混合性能比对列的好，但其压力损失系数比对列的大；波瓣内外间距相同的二元波瓣喷管比波瓣内间距为外间距两倍的气动性能好；波瓣切口错列的二元波瓣喷管的引射性能和强化混合性能最好，但其压力损失系数也最大。在各组合方案中，波瓣间距相同对列的二元波瓣喷管与带有多套环结构的混合管组成的排气引射系统综合气动性能最好

EXPERIMENTAL RESEARCH OF 2 D LOBED EXHAUST EJECTOR SYSTEMS

Experimental research for seven combinations of four two dimensional (2 d) lobed nozzles with two 2 d mixing tubes of exhaust ejector systems has been conducted to investigate the effect of the lobe structure on the aerodynamic performance of the ejector systems. Test results show that 2 d staggered lobed nozzles have better pumping and mixing enhancement ability than the 2 d aligned lobed nozzles, but they also cause bigger pressure loss; the 2 d lobed nozzles with equal lobe width have better aerodynamic performance than the 2 d lobed nozzles with internal width equal to two times the external width. The 2 d scalloped staggered lobed nozzle has the best pumping and mixing enhancement performance, but it also has the biggest pressure loss coefficient. Among the experimental model combinations, the combination of 2 d lobed nozzle with equal lobe width and 2 d mixing tube with multiple ring cooling structure has the best aerodynamic performance.