新型消旋波瓣混合器射流掺混机理研究

Research on Jet Mixing Mechanism of a New De-Swirling Lobed Mixer

为了消除高进口预旋时波瓣混合器表面流动分离,将基准波瓣混合器侧壁直叶瓣设计成类叶型式的折转叶瓣,形成一种新型消旋波瓣混合器。研究了多种进口预旋工况下消旋波瓣性能参数、涡系发展以及射流掺混机理与基准直波瓣的异同。结果表明:新型消旋波瓣改善了进口预旋工况下波瓣吸力面压力分布;重新组织了波瓣出口截面气流周向角度的径向分布。在进口预旋超过10°以后,消旋波瓣混合器的总压损失以及波瓣式喷管的总压损失均小于基准直波瓣。消旋波瓣混合器在高进口预旋时性能优异,波瓣出口截面周向气流确实加速了下游射流掺混。

In order to eliminate the flow separation on lobed mixer surface in the case of aggressive inlet core swirl,a new de-swirling lobed mixer was achieved by altering straight lobes to vane-shaped bend lobes.A comparison was made between de-swirling and baseline lobed mixer to clarify the changes of aerodynamic performance,vortices development and mixing mechanism by varying the core inlet swirl cases.The results showed that the lobed suction surface static pressure distribution of new de-swirling lobed was improved in inlet swirl cases,the radial distribution of circumferential swirl angle at lobed exit plane was re-organized.The total pressure losses of lobed and nozzle for de-swirling lobed mixer were less than baseline lobed when core inlet swirl exceeds 10°.The de-swirling lobed mixer gives a better performance than baseline in aggressive inlet swirl cases.The swirling flow at lobed exit plane does accelerate the downstream jet mixing.