Noise reduction and thrust enhancement in various modified chevron nozzle
International Journal of Development Research
Noise reduction and thrust enhancement in various modified chevron nozzle
Received 11th October, 2017; Received in revised form 26th November, 2017; Accepted 20th December, 2017; Published online 31st January, 2018
Copyright © 2018, Sasi kumar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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.
