Experimental Study of Oblong Exhaust Ejectors With Multiring Oblong Entraining Diffusers
Experimental Study of Oblong Exhaust Ejectors With Multiring Oblong Entraining Diffusers
复制标题
多环长方形引流器长方形排气喷射器的实验研究
DOI：
10.1115/1.2943195
复制
发表时间：
2009
影响因子：
1.5
通讯作者：
A. M. Birk
中科院分区：
文献类型：
--
作者：
Qi Chen;A. M. Birk
本文介绍了两种带有四个椭圆形引射扩散器的椭圆形直空气-空气引射器的性能的实验数据。研究了入口旋流角、喷嘴直径和气流温度对引射器抽气、背压、壁面压力分布、扩压器压力恢复和表面气膜冷却效率的影响。实验在热气风洞上进行，该风洞在环境温度下可提供高达2.2 kg/s的一次质量流率，在500°C下可提供1.8 kg/s的一次质量流率。在主喷嘴上游的环形空间、混合管和扩压器壁上、扩压器间隙入口和扩压器出口处测量速度、压力和温度。椭圆形引射器和圆形引射器的性能之间的比较表明，对于短长度的引射器，椭圆形引射器提供了更好的整体性能的泵送和速度和温度分布。
This paper presents experimental data,for the performance of two oblong, straight, air-air ejectors with four-ring oblong entraining diffusers. The effects of inlet swirl angle, nozzle diameter, and flow temperature on the ejector pumping, backpressure, wall pressure distribution, diffuser pressures recovery, and surface film cooling effectiveness were studied. The experiments were carried out on a hot gas wind tunnel that could provide primary mass flow rates up to 2.2 kg/s at ambient temperature and 1.8 kg/s at 500°C. Velocity, pressure, and temperature were measured in the annulus upstream of the primary nozzle, on the mixing tube and diffuser walls, at the diffuser gap inlets, and at the diffuser exit. A comparison between the performance of the oblong ejector and a round ejector indicated that for a short length ejector, the oblong ejector provided better overall performance in terms of pumping and velocity and temperature distributions.