Experimental Investigation of Nozzle Exit Reflector Effect on Supersonic Jet |
| |
Authors: | Y.-H. Kweon Y. Miyazato T. Aoki H.-D. Kim T. Setoguchi |
| |
Affiliation: | (1) Department of Energy and Environmental Engineering, Kyushu University, 6-1, Kasuga Kouen, Kasuga, Fukuoka 816-8580, Japan;(2) School of Mechanical Engineering, Andong National University, 388, Songchun-dong, Andong, 760-749, Korea;(3) Department of Mechanical Engineering, Saga University, 1, Honjo, Saga 840-8502, Japan |
| |
Abstract: | The present study describes an experimental work to investigate the effect of a nozzle exit reflector on a supersonic jet that is discharged from a convergent–divergent nozzle with a design Mach number of 2.0. An annular reflector is installed at the nozzle exit and its diameter is varied. A high-quality spark schlieren optical system is used to visualize detailed jet structures with and without the reflector. Impact pressure measurement using a pitot probe is also carried out to quantify the reflector’s effect on the supersonic jet which is in the range from an over-expanded to a moderately under-expanded state. The results obtained show that for over-expanded jets, the reflector substantially increases the jet spreading rate and reduces the supersonic length of the jet, compared with moderately under-expanded jets. The reflector’s effect appears more significant in imperfectly expanded jets that have strong shock cell structures, but is negligible in correctly expanded jet. |
| |
Keywords: | Supersonic jet Jet oscillation Jet mixing Shock cell Impact pressure |
本文献已被 SpringerLink 等数据库收录! |
|