Volume 3, 2012Progress in Flight Physics
|Page(s)||405 - 420|
|Section||Chapter Five. Aeroacoustics|
|Published online||29 January 2013|
Acoustic environment resulting in interaction of launch vehicle main engines jets with a launch pad having closed long ducts like a tunnel
Central Research Institute of Machine Building (TSNIIMASH) Pionerskaya Str. 4, Korolev 141070, Moscow region, Russia
Paper deals with elaboration of semiempirical technique for prediction of broadband acoustic field generated at interaction of launch vehicle main engines jets with a launch pad having closed long ducts like a tunnel. Approach to a problem is based on analysis of jet interaction with typical deflectors, extraction of characteristic noise generation regions, and substitution of each region of noise generation by a system of independent acoustic sources with prescribed acoustic power and spectrum of acoustic radiation. Comparisons of calculated results with experimental data indicate that the technique allows to make reliable estimations of acoustical field characteristics as a function of geometrical and gasdynamic parameters and to analyze different means for reduction of acoustic loading at lift-off. Use of elaborated technique for multibody launch vehicles with clustered engines and multiduct launch pads is considered.
© Owned by the authors, published by EDP Sciences, 2012