Determination of near and far field acoustics for advanced propeller configurationsA method has been studied for predicting the acoustic field of the SR-3 transonic propfan using flow data generated by two versions of the NASPROP-E computer code. Since the flow fields calculated by the solvers include the shock-wave system of the propeller, the nonlinear quadrupole noise source term is included along with the monopole and dipole noise sources in the calculation of the acoustic near field. Acoustic time histories in the near field are determined by transforming the azimuthal coordinate in the rotating, blade-fixed coordinate system to the time coordinate in a nonrotating coordinate system. Fourier analysis of the pressure time histories is used to obtain the frequency spectra of the near-field noise.
Document ID
19890053098
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Korkan, K. D. (Texas A&M Univ. College Station, TX, United States)
Jaeger, S. M. (Texas A&M Univ. College Station, TX, United States)
Kim, J. H. (Texas A & M University College Station, United States)