Noise reduction and thrust enhancement in various modified chevron nozzle

International Journal of Development Research

Volume: 
8
Article ID: 
11973
5 pages
Research Article

Noise reduction and thrust enhancement in various modified chevron nozzle

Sasi kumar, M., Abirami, K., Sandhiya, K., Vijay, G. and Vishnu Varthan, S.

Abstract: 

The aircraft jet noise drop a crucial problem in aero-acoustics research. Acoustic studies tell that addition of chevrons to the nozzle reduces the sound pressure level reasonably with acceptable decrease in performance. In this paper complete numerical studies on acoustic characteristics of different types of chevron nozzles have been carried out with non-reacting flows for the shape optimization of chevrons in supersonic nozzles for aerospace applications. The numerical studies have been carried out using a validated steady 3D density based, k-ε turbulence model. In this paper chevron with sharp edge, flat edge, round edge and U-type edge are selected for the jet acoustic characterization of supersonic nozzles. We observed that compared to the base model a case with round-shaped chevron nozzle could reduce 4.23% acoustic level with 0.7% thrust loss. We accomplished that the prudent selection of the chevron shape will enable a visible reduction of the aircraft jet noise without compromising its overall performance. It is evident from the present numerical simulations that k-ε model can expect reasonably well the acoustic level of chevron supersonic nozzles for its shape optimization.

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