On the Scaling Laws and Similarity Spectra for Jet Noise in Subsonic and Supersonic Flow

Kandula, Max

PID  :  NTRS Document ID: 20130012213
RP-ID  :  KSC-2008-053

学科分类：声学和超声波

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

The scaling laws for the simulation of noise from subsonic and ideally expanded supersonic jets are reviewed with regard to their applicability to deduce full-scale conditions from small-scale model testing. Important parameters of scale model testing for the simulation of jet noise are identified, and the methods of estimating full- scale noise levels from simulated scale model data are addressed. The limitations of cold-jet data in estimating high-temperature supersonic jet noise levels are discussed. New results are presented showing the dependence of overall sound power level on the jet temperature ratio at various jet Mach numbers. A generalized similarity spectrum is also proposed, which accounts for convective Mach number and angle to the jet axis.