Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Design and research of ejector based on skid mounted nozzle back pressure control
| DOI: | 10.11809/bqzbgcxb2024.02.016 |
| Keywords: | rocket sled; nozzle; ejector; expansion ratio |
| Abstract: | In order to solve the problem of high back pressure in the rocket sled test skid nozzle and verify the feasibility of the ejector design, a two dimensional ejector performance prediction model was established. It used the FLUENT software and k ε turbulence model to study the influence of the ejector and its key design parameters on the internal flow field of the nozzle, and revealed the mixing mechanism of the internal and external flow field of the test device.The numerical analysis results show that the ejector is suitable for the test conditions of large expansion ratio and low Ma number; With the increase of the ejector total pressure and ejection flow of the engine, the ejection effect is more obvious. The distance between the ejector and nozzle end and the size of the ejection angle are negatively correlated to the ejection efficiency. It should be ensured that the ejector gas/air flow ratio is more than 0.75 in the design, and test area before the shock wave in the middle and rear is increased by 0.42 m2 and 0.75 m2; After the ejector is added in the test system, the average Mach number of the test section is increased from 2.6 to 3.3, and the uniformity is increased by about 72%. |
| Published: | 2024-02-28 |