Author : Aishwarya Singh Rathore 1
Date of Publication :22nd March 2018
Abstract: Noise emission control from the jet engine is one of the biggest emerging concerns for the aviation industry as well as for the defence organization. Every year, the aviation industry is facing the 1-billion-dollar loss because of the tremendous emission of noise from the aircraft engines. In future, for certification process of an aircraft, noise emission level will be set as one of the norms in the inspection. Taking into consideration this global concern, in the present investigation, a computational study was carried out to reduce the jet noise for subsonic aircraft by achieving the enhanced jet mixing rate. Computational analysis was done to study the effect of vane orientation angle and its shape on a coaxial jet. The vanes were positioned in the annular passage of the coaxial jet in the coaxial duct. The analysis was done to study the effect of vane orientation angle (0°, 10° and 30°) and vane shapes namely rectangle and a rectangle with positive fillet on a jet mixing of a subsonic coaxial jet using ANSYS16. For computational analysis, the inlet boundary condition was given as 92.1m/s along with the free slip wall condition. Results indicate that the jet mixing rate was enhanced for the vane with the positive filleted rectangular cross-section of vane angle 30°.
- E. G. Broadbent, “Noise shielding for aircraft”, Royal Aircraft Establishment, Farnborough, Prog. Aerospace Sci, Vol. 17, pp, 231-268. Pergamon Press. Printed in Great Britain, 1977.
- M.R. Ahmed and S.D. Sharma, “Effect of velocity ratio on the turbulent mixing of confined, co-axial jets”, Experimental Thermal and Fluid Science, 22, 19-33, 2000.
- Ronald D. Joslin, Russell H. Thomas and Meelan M. Choudhari, “Synergism of flow and noise control technologies”, Progress in Aerospace Sciences, 41,363–417, 2005.
- Nicholas J. Georgiadis and James R. DeBonis, “Navierstokes analysis methods for turbulent jet flows with application to aircraft exhaust ducts”, Progress in Aerospace Sciences, 42 377–418, 2006
- NevinCelik and HaydarEren, “Heat transfer due to impinging co-axial jets and the jets‟ fluid flow characteristics”, Experimental Thermal and Fluid Science, 33, 715–727, 2009
- V. Vlasenko, S. Bosniakov, S. Mikhailov, A. Morozov and A. Troshin, “Computational approach for investigation of thrust and acoustic performances of present-day ducts”, Progress in Aerospace Sciences, 46,141–197, 2010.
- H. Xia, P. G. Tucker, S. Eastwood and M. Mahak, “The influence of geometry on jet plume development”, Progress in Aerospace Sciences, 52, 56–66, 2012
- Antonio Filippone, “Aircraft noise prediction”, Progress in Aerospace Sciences, 68, 27-63, 2014.