掺混压力损失的实验分析

一、试验装置和基本关系式 试验装置的进排气系统均由三根并列管道组成。第Ⅰ、Ⅲ管道作为外流,第Ⅱ管道作为主流,在试验段前6m处装加温器,加温后的气体温度最高可达600℃。试验件为三股通道的矩形件,其尺寸为800×256×240mm,主流通道高为140mm,外流通道高为50mm。试验孔板将主流通道与外流通道隔开。外流通道中气流经小孔射入主流,与主流掺混,引起主流掺混压力损失(图1)。

AN EXPERIMENTAL RESEARCH ON MIXTURE PRESSURE LOSS IN COMBUSTOR

Mixture of cold air flow from annular pass through holes with main flow(cold or hot stream) has been researched experimentally. The momentum exchange for annular pass air flow through plain or plunge circular holes into main flow has been studied experimentaaly on a rectagular test section in a simulated combustion chamber. The momentum exchange increases the pressure loss of the main air stream near the jet holes. The results show that the mixture pressure loss of combustor with plunge circular holes is 1 to 1. 5 time as large as that of the combustor with plain circular holes. Therefore, the combustor with plunge circular holes is favourable to combustion and may reduce the length of the combustor.