This paper discusses recent developments and enhancements which are implemented into the TIN2 program. TIN2 is the second generation Turbulence Ingestion Noise prediction model. The program modules developed for rotor aerodynamic performance, atmospheric turbulence ingestion, and acoustic analysis are combined into a unified program architecture. Number of new features are added to the program in order to further extend its capability for tiltrotor acoustic analysis due to fountain flow effects. Among many, one of the most important improvements is the rotor azimuthal variations of inflow turbulence ingestion and their induced flow distortion matrix computation. In order to enable accurate analysis of the fountain flow effects and its noise reduction assessments, an arbitrary partial rotor inflow turbulence ingestion is added. The azimuthal variation of the rotor mean downwash values is computed by coupling the TIN2 program with a rotor-body CFD solver ROTTILT. By incorporating an experimentally based turbulence spectrum due to fountain flow effects, TIN2 predictive capabilities are further enhanced. Control input parameter perturbations are employed to assess the accuracy of its predictive capability. Both noise and flow field validations are performed with two sets of experimental data; 1) Bell's 15% semi-span model tiltrotor, and 2) Cornell's 1/12.5 full-span model XV-15. The aero/acoustic correlation results with the experimental data demonstrate that the TIN2 program can be employed effectively for tiltrotor inflow turbulence ingestion noise prediction and reduction analysis.
TIN2 model developments & enhancements - a turbulence ingestion noise prediction for tiltrotor with fountain flow effects
1999
19 Seiten, 29 Quellen
Aufsatz (Konferenz)
Englisch
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