급확대 디퓨져에서의 박리제어에 관한 실험적 연구 = An Experimental Study on Control of Separation on Wide-Angle Diffusers

다국어 초록 (Multilingual Abstract)

The aim of using diffuser is that convert dynamic pressure to static pressure.But, if diffusion angle of diffuser is very large, separation is generated.This separation products energy loss and reduces pressure recovery coefficient.To overcome this energy loss vortex flow is put into by vortex generator jet to the tangential direction main pipe.
In this study, flow separation and pressure recovery coefficient in two annular diffusers, diffusion angle(2 α) of one is 14˚ and the other is 30˚ are investigated using pressure manometer and hot-wire anemometer.Experimental parameter is velocity ratio(Vjep/Um) 0, 0.5, 1.0, 1.5 and 2.0.Main results obtained through this study are summarized as follows ;
1) In case of diffusion angle 14˚ diffuser, pressure recovery coefficient is improved 16.2% at velocity ratio(Vjep/Um) 2.0, and in case of diffusion angle 30˚ diffuser, pressure recovery coefficient is improved 64.7% at velocity ratio (Vjep/Um) 2.0.
2) Result of velocity distribution experimental, constraint by vortex generator jet of separator is confirmed.

목차 (Table of Contents)

• Ⅰ.서론
• Ⅱ.본론
• 1.실험장치 및 방법
• 2.실험 결과 및 고찰
• Ⅲ.결론