ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Starting and operating characteristics of precooled supersonic ejector
Received date: 2024-05-17
Revised date: 2024-06-14
Accepted date: 2024-07-31
Online published: 2024-08-05
Supported by
National Natural Science Foundation of China(12002372);Young Elite Scientists Sponsorship Program by
In the field of aerospace engineering， supersonic ejectors find extensive applications， typically for suctioning secondary flows and generating low-pressure environments. To enhance the performance of supersonic ejectors， this paper proposes a novel design of a precooled supersonic ejector. The ejector adopts a dual-nozzle structure with strut and uses a precooler to precool the secondary flows with temperatures exceeding 1 100 K. Through a combined approach of experimental and numerical methods， the starting characteristics， operating characteristics， and the influence of precooling secondary flows on the performance of the precooled supersonic ejector are analyzed. The research findings indicate that when the total pressure of the primary flow exceeds 3.0 MPa， the precooled supersonic ejector can start completely， with the suction chamber pressure becoming stabilized at 3.46 kPa. However， in the critical starting state， the ejector flow channels do not achieve full supersonic flow， and shock trains affect the suction chamber. In the fully started state， the two jets collide after accelerating out of the nozzles， leading to an initial rise followed by a decrease in static pressure near the nozzle exit. Conversely， when the ejector is in the operating mode， there is an initial decrease followed by an increase in static pressure near the nozzle exit. Additionally， regardless of starting or operating conditions， shockwave intersections and reflections exist in the ejector flow channels， forming diamond-shaped regions. These regions gradually disappear with an increase in the secondary flow rate and temperature of the regions. Under the condition of low entrainment ratio， precooling secondary flows effectively enhance the mixing efficiency of the primary and secondary flows， but this advantage diminishes at high ejector coefficients. Furthermore， precooled passive flows can effectively increase the compression ratio of the ejector， with the enhancement exceeding 33.3%.
Tao LIANG , Wanwu XU , Zhiyan LI , Saiqiang ZHANG , Gang LI , Dongdong ZHANG . Starting and operating characteristics of precooled supersonic ejector[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(2) : 130701 -130701 . DOI: 10.7527/S1000-6893.2024.30701
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