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Numerical study on the flow characteristics of ejector nozzle with wide-speed range under cruise state(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年06期
Page:
22-29
Research Field:
研究与设计
Publishing date:

Info

Title:
Numerical study on the flow characteristics of ejector nozzle with wide-speed range under cruise state
Author(s):
CAI Jia1; 2; LI Zijie2; HUANG Hexia2; ZHANG Kexin2; TAN Huijun2
(1.School of Aeronautic Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China; 2.College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
Keywords:
ejector nozzle with wide speed range;  shear layer;  ejecting coefficient;  thrust coefficient
PACS:
V236
DOI:
-
Abstract:
To obtain the flow characteristics of an ejector nozzle under the cruise state, an ejector nozzle operating in the range of Mach number 0～4 is designed.The typical flow features under the 4 Ma cruise state are analyzed, and the effects of ejecting coefficient, which is defined as the product of the square root of total-temperature and the flow ratio between the secondary flow and the primary flow, on the flow structure as well as the thrust performance are studied emphatically.The results indicate that the main flow structure inside the ejector nozzle is mainly composed of the shock wave and the shear layer between the main flow and secondary flow under the cruise state.The shock gets intensified gradually along the shock direction.The shear layer inside the ejector nozzle has two typical states of “attached to the surface” and “detached from the surface”.As the ejecting coefficient increases, the shear layer transforms from the state of “attached to the surface” to the other one, and the shock strength in the tube shows a gradual weakening trend, while the thrust coefficient increases first and then decreases.When the ejecting coefficient is between 0.006 and 0.06, the thrust coefficient is higher than 0.95.

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