空气旋流器对短环形回流燃烧室性能的影响

目前在小发动机领域中,采用环形回流燃烧室作为核心部件几乎已成为普遍的发展趋势,这不仅是因为采用环形回流燃烧室能使其容热强度成倍增加,而且燃烧室的寿命也随着气膜冷却技术的发展和设计、工艺水平的提高而大大延长。此外,还有一个重要的原因是它可以使发动机轴缩短近40%,使发动机总体布局更加合理。怎样在短小的燃烧室内更好地组织燃烧便成了短环形回流燃烧室设计的关键。传统的环形回流燃烧室大部分采用封闭式头部,火焰筒内部气流结构对于目前的火焰筒长度是匹配的。但是新型的高性能小发动机为了缩短低压轴的跨度要求,回流燃烧室的长度更短,对于这样的短环回流燃烧室怎样充分利用燃烧空间,本文作了探讨。试验用的短环形回流燃烧室采用封闭式及带45°扭角和60°扭角的旋流器头部的三种结构方案,对各个试验件性能作了较详细的分析、比较,取得了有用的结果。 

THE EFFECT OF SWIRLER ON SHORT REVERSAL-FLOW ANNULAR COMBUSTOR

A short reversal flow annular combustor has been tested with three different flame liner heads.The gas parameters of exit section are detected by a turning measuring system,and data are processed by a PC 8001 microcomputer.Experimental results of efficiency,temperature field of exit section,flame stabilization and pressure loss are presented.The effect of a swirler on the short reversal flow annular combustor is illustrated by comparison and analysis.The experimental study shows that it is suitable to install a swirler on the flame liner head in a short reversal flow annular combustor.This method can improve the combustor performance greatly.However,it should be noted that when a swirler is installed ,its direction angle ought not to be too big,other wise,as a result,carbon deposit will emerge,the swirler will give a negative effect on the combustor.