Supersonic sweeping jets (SWJs) have demonstrated their effectiveness across a variety of scenarios, particularly in aeronautic applications (e.g., lift enhancement). An experimental study is conducted to investigate the characteristics of SWJs emitted from actuators with different spreading angle and exit length . Schlieren visualization is used to capture the near- and far-field SWJs at nozzle pressure ratios (NPRs) ranging from 1.6 to 6.9. The results show that as NPR increases the SWJs become underexpanded when . Different have an impact on the shock structure and the law of the spreading angle of jet control area changing with NPR. When is approximately 100 deg, increases at first and then decreases with increasing NPR, reaching up to 90 deg at high NPRs. When is about 50 deg, remains roughly constant and equal to . Internal flow measurements reveal that flow attachment caused by the Coanda effect plays a significant role in the mechanism that leads to a change in . Proper orthogonal decomposition is applied to analyze the spatial and temporal patterns. Far-field measurements show multiple sound waves propagating upstream and downstream, which generated by the supersonic SWJs.
Characteristics of Supersonic Sweeping Jet with Geometry Variation of Actuator Exits
AIAA Journal ; 1-14
2024-08-22
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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