Experimental research on noise reduction of bionic axial fan blade and mechanism analysis
Experimental research on noise reduction of bionic axial fan blade and mechanism analysis
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发表时间：
2009
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通讯作者：
Zhang Yong-zhi
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作者：
Zhang Yong-zhi
针对长耳猫头鹰非光滑前缘翼对降低飞行噪声效果显著的特点，设计了一种非光滑前缘的仿生轴流风扇叶片。中试实验表明，在50~2000 Hz频率范围内，仿生非光滑叶片的噪声水平明显低于原型叶片，最大降噪率为2.52%。影响仿生非光滑叶片降噪的因素依次为：非光滑元件的间距、高度和数量。计算机仿真分析表明，非光滑前缘形态的降噪机理在于减小翼型表面湍流边界层压力脉动，延缓后翼型脱落涡分离，减少翼型间的混沌气流，从而对后续翼型周围的气流进行整流，控制湍流分离，从而达到降低湍流噪声的目的。
According to the fact that the long-eared owl wing with non-smooth leading edge demonstrates a remarkable reduction of the flight noise a kind of bionic axial fan blade with non-smooth leading edge was designed.The pilot experiments show that the noise level of the bionic non-smooth blade in the 50~2000 Hz frequency range is remarkable lower than that of the prototype blade,the maximal noise reduction rate is 2.52%.The factors affecting the noise reduction of the bionic non-smooth blade are in the order of importance as follows:the interval,the height and the number of the non-smooth element.The computer simulation analysis shows that the noise reduction mechanism of the non-smooth leading morphology consists in the reducing the airfoil surface turbulent boundary layer pressure pulsation,retarding the rear airfoil shedding vortex separation,reducing the chaos airflow among the airfoils,thus rectifying the flow around the subsequent airfoil to control the turbulence breakaway,all these results in reduction of the turbulent flow noise.