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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (5): 126848.doi: 10.7527/S1000-6893.2022.26848

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Suppression of exhaust plume infrared and jet noise of large aspect ratio curved mixing duct

Zongyao YANG, Jingzhou ZHANG(), Yong SHAN   

  1. College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
  • Received:2021-12-23 Revised:2022-01-13 Accepted:2022-03-02 Online:2023-03-15 Published:2022-03-04
  • Contact: Jingzhou ZHANG E-mail:zhangjz@nuaa.edu.cn
  • Supported by:
    National Science and Technology Major Project(J2019-III-0009-0053)

Abstract:

To suppress exhaust plume infrared and jet noise of the curved mixing duct with a large aspect ratio, the structure of the mixing duct nozzle is redesigned on the basis of the narrow rectangular nozzle, including lobed nozzles with different structural parameters and coronal sawtooth nozzles with different intrusion degrees. The numerical simulation method is used to obtain the jet flow field of the above nozzles. The forward-reverse ray-tracing method and FW-H acoustic module of Fluent software are used to calculate the infrared radiation intensity of the exhaust plume and the overall sound pressure level of the jet, respectively. Analysis of the results reveals the mechanism of influence of the narrow rectangular nozzle, lobe nozzle and coronal sawtooth nozzle on the pumping performance, pressure loss and exhaust plume infrared and jet noise characteristics of the mixing duct. The strengthening leading role of the flow vortex excited by the lobe nozzle and sawtooth nozzle in the mixing process of jet and ambient air flow and the abilities of the flow vortex to suppress both exhaust plume infrared radiation and jet noise are also explained.

Key words: mixing duct, large aspect ratio, lobed nozzle, coronal sawtooth nozzle, exhaust plume infrared, jet noise

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