Efficient Prediction of Helicopter BVI Noise under Different Conditions of Wake and Blade Deformation

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概要

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• Predictions of helicopter BVI noise using three-dimensional Euler code with a single blade grid are conducted under three different conditions: BVI noise caused by (1) interaction between rotating blades and vortex shed from fixed wing vortex generator, (2) interaction between rotating blades and tip vortices shed from preceding blades, and (3) interaction between rotating blades with elastic deformation and shed tip vortices. In the CFD calculation, the Field Velocity Approach (FVA) and Scully’s vortex model are used to import the wake information into the calculation grid and to determine the induced velocity made by tip vortices, respectively (cases 1–3). Beddoes generalized wake model is used to prescribe the tip vortices position in the wake (cases 2 and 3). Information about blade elastic deformation is imported from HART II project experimental data into the calculation (case 3). Acoustic analyses based on Ffowcs-Williams and Hawkings (FW-H) equation are conducted subsequently in each case. The results from the calculations show good agreement with experiments in all three cases, indicating that application of FVA, Scully’s model, and Beddoes generalized wake model is effective for BVI noise prediction in this study, which is intended for low calculation cost using a single blade grid. Also, use of blade elastic deformation data in the calculation shows marked improvement in calculation precision. Consequently, the method used in this study can predict BVI noise under various conditions of wake or blade deformation with acceptable precision and low calculation cost.

• 社団法人 日本航空宇宙学会の論文
• 2008-11-04

著者

• Aoyama Takeshi

  Japan Aerospace Exploration Agency (jaxa)

• INADA Yoshinobu

  Japan Aerospace Exploration Agency (JAXA)

• YANG Choongmo

  Japan Aerospace Exploration Agency (JAXA)

• IWANAGA Noriki

  Research Center of Computational Mechanics, Inc. (RCCM)

• Yang Choongmo

  Japan Aerospace Exploration Agency

• Iwanaga Noriki

  Research Center Of Computational Mechanics Inc. (rccm)

関連論文

• Efficient Prediction of Helicopter BVI Noise under Different Conditions of Wake and Blade Deformation
• Aerodynamic/Acoustic Analysis for Main Rotor and Tail Rotor of Helicopter
• Numerical Analysis of Sound Generation and Transmission from Flapping Wings
• Numerical Analysis of Maneuvering Rotorcraft Using Moving Overlapped Grid Method

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