B-21 Large Eddy Simulationを用いたジェット騒音低減デバイスの効果(ジェット騒音,一般講演)

概要

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The notched nozzle as a new concept has been investigated for simple nozzle design together with the Chevron nozzle and Micro-jets. One Concept of a conventional noise mitigation device involves mixing enhancements in the shear layer between high velocity jet and external flow, but this sometimes produces high frequency self noise. Moreover it will result in a penalty in terms of thrust loss, additional weight and extra manufacturing cost. It is also difficult to produce a nozzle design that will not affect high frequency self-noise. In this study, we are going to physically validate three kinds of nozzle concepts by numerical predictions using Large Eddy Simulation in order to estimate the noise mitigation by performing turbulence statistical analysis.
公益社団法人日本ガスタービン学会の論文
2010-10-20