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High Speed Turboprop Aeroacoustic Study Single Rotation Volume 1

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High Speed Turboprop Aeroacoustic Study Single Rotation Volume 1

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-18

High Speed Turboprop Aeroacoustic Study Single Rotation Volume 1 written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-18 with categories.

A frequency-domain noncompact-source theory for the steady loading and volume-displacement (thickness) noise of high speed propellers has been developed and programmed. Both near field and far field effects have been considered. The code utilizes blade surface pressure distributions obtained from three-dimensional nonlinear aerodynamic flow field analysis programs as input for evaluating the steady loading noise. Simplified mathematical models of the velocity fields induced at the propeller disk by nearby wing and fuselage surfaces and by angle-of-attack operation have been developed to provide estimates of the unsteady loading imposed on the propeller by these potential field type interactions. These unsteady blade loadings have been coupled to a chordwise compact propeller unsteady loading noise model to provide predictions of unsteady loading noise caused by these installation effects. Finally, an analysis to estimate the corrections to be applied to the free-field noise predictions in order to arrive at the measurable fuselage sound pressure levels has been formulated and programmed. This analysis considers the effects of fuselage surface reflection and diffraction together with surface boundary layer refraction. The steady loading and thickness model and the unsteady loading model have been verified using NASA-supplied data for the SR-2 and SR-3 model propfans. In addition, the steady loading and thickness model has been compared with data from the SR-6 model propfan. These theoretical models have been employed in the evaluation of the SR-7 powered Gulfstream aircraft in terms of noise characteristics at representative takeoff, cruise, and approach operating conditions. In all cases, agreement between theory and experiment is encouraging. Whitfield, C. E. and Gliebe, P. R. and Mani, R. and Mungur, P. Unspecified Center AERODYNAMIC LOADS; AERODYNAMIC NOISE; AIRCRAFT NOISE; FLOW DISTRIBUTION; INTERACTIONAL AERODYNAMICS; MATHEMATICAL MODELS; NOISE PREDICTION (AIRC...

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1989

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aeronautics categories.

Unified Aeroacoustics Analysis For High Speed Turboprop Aerodynamics And Noise Volume 1 Development Of Theory For Blade Loading Wakes And Noise

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Author : D. B. Hanson
language : en
Publisher:
Release Date : 1991

Unified Aeroacoustics Analysis For High Speed Turboprop Aerodynamics And Noise Volume 1 Development Of Theory For Blade Loading Wakes And Noise written by D. B. Hanson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.