Suppression of supersonic block jets noise by water injection

Authors

  • Vladimir L. Bakulev St. Petersburg State University, Universitetskaya nab., 7-9, St. Petersburg, 199034, Russian Federation; JSC "Design bureau of special mechanical engineering", Lesnoy pr., 64, St.Petersburg, 194100, Russian Federation;
  • Alexey M. Vorobyov St. Petersburg State University, Universitetskaya nab., 7-9, St. Petersburg, 199034, Russian Federation; JSC "Design bureau of special mechanical engineering", Lesnoy pr., 64, St.Petersburg, 194100, Russian Federation;

Abstract

The present work experimentally investigates an acoustic field of a supersonic block jet and suppression of the sound level by water injection. The jet is produced by a solid rocket motor. Water jets are injected to the combined jet along its perimeter at an angle 0◦ and 60◦. It is established that process of afterburning of fuel is capable to create discrete tone (screech) of the big amplitude and water injection at an angle 60◦ completely deletes this discrete tone. Wavelet transform showed a relation of frequency of discrete tone to pressure in a combustion chamber. It was determined that injection angle of 60◦ has greater effectiveness to reduce sound levels. Refs 12. Figs 6.

Keywords:

supersonic jet noise, acoustic suppression, water injection, wavelet transform

Downloads

Download data is not yet available.

Downloads

Published

2015-08-01

How to Cite

Bakulev, V. L., & Vorobyov, A. M. (2015). Suppression of supersonic block jets noise by water injection. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2(3), 415–425. Retrieved from https://math-mech-astr-journal.spbu.ru/article/view/11176

Issue

Vol. 2 No. 3 (2015)

Section

Mechanics

License

Articles of "Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy" are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.