低HSI噪声旋翼桨尖外形优化设计方法

doi:10.7527/S1000-6893.2014.0208

Abstract

Abstract:

Based on computational fluid dynamics (CFD)/FW-H_pds methods (Ffowcs Williams-Hawkings equations with penetrable data surface) and hybrid optimization technique, an optimization design procedure for rotor planform with low HSI noise characteristics is established. In this solver, based on the moving-embedded grid methodology, a CFD simulation method for the aerodynamic characteristics of rotor is developed by solving the compressible Reynolds-averaged Navier-Stokes (RANS) equations. During the optimization process, the high-qualified blade grids are generated by a high-efficient parameterized method. Additionally, the high-speed impulsive (HSI) noise characteristics generated by transonic helicopter rotor are analyzed through a robust prediction method based on FW-H_pds equations. Aimed at the minimization of the absolute sound pressure peak value, optimization analyses based on the rotor blade with double-swept and tapered tip have been accomplished with the aerodynamic performance in hover as constraints. The genetic algorithm and surrogated model based on Latin hypercube sampling (LHS) design and radial basis function (RBF) are combined as a hybrid optimization technique. Compared with rectangular blades, it shows that the minimum acoustics pressure of rotor with optimized blade-tip shape is decreased by 58.4% at the present calculating condition. For the rotor with optimized blade-tip, the HSI noise level can be reduced effectively due to its weaker transonic "delocalization" phenomenon in the region of blade-tip and the blade-tip vortex strength is decreased by 30% which results in the improvement of the FM about 2%-3%.

Key words: rotor, high-speed impulsive noise, blade-tip shape, surrogated model, genetic algorithm, computational fluid dynamics, FW-H equations

CLC Number:

V211.52

ZHU Zheng, ZHAO Qijun. Optimization design method for rotor blade-tip shape with low HSI noise characteristics[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(5): 1442-1452.

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Optimization design method for rotor blade-tip shape with low HSI noise characteristics

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