两个模型螺桨声场性质的实验研究
ACOUSTIC EXPERIMENTS OF TWO SCALED-MODEL PROPELLERS ON THE GROUND
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摘要: 本文利用两个缩尺模型螺桨在地面上进行了一些声场性质对比实验,实验结果表明,ARA-D翼型4叶桨的气动与声学性能均优于NACA64翼型3叶桨,螺桨辐射声场具有指向性特征,在螺桨噪声中,离散噪声居主导地位,其中前几次谐波所占份额又最多,这对新型螺桨设计和螺桨飞机舱壁隔声具有一定的参考价值。Abstract: Propeller acoustic exper iments have been completed on the ground.The experimental results show that the aerodynamic and acoustic performances of 4 bla des ARA D propeller are better than that of the 3 blades NACA64 propeller.The sound field of propellers has directional properties,and i t is dominated by discrete tones,especially the 1～5×BPG tones.So,increase of the blade number and application of the advanced aerofoil w ill be very effective to improve aerodynamic and acoustic performances of the propeller.The best way for propeller noise reduction and aircraft fuselage noise suppression is a try to reduce the propeller discrete tones,especially the 1～5×BPF tones.
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