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为了研究云状空化阶段空穴发展和脱落的机理,采用实验的方法对绕三维水翼云状空化流动进行了研究。实验在高速水洞中进行,采用高速摄像技术研究了不同空化阶段的空穴形态,并测量了翼型所受的升阻力,并对上述数据进行了频谱分析。结果发现:在云状空化阶段,观测到空穴的产生-发展-脱落-溃灭的准周期性变化;并捕捉到空泡脱落时附着在翼型前端的U型空穴和翼型方向上不同强度的反向射流;空泡由翼型中前部开始呈漩涡状脱落。将升力通过FFT变换得到了对应的频谱图,得到空穴脱落的频率为24.3Hz。
In order to study the mechanism of cavity growth and shedding in the cloud-like cavitation phase, the cloud-like cavitation flow around the three-dimensional hydrofoil was studied by the experimental method. Experiments were carried out in high-speed water tunnels. The high-speed camera technology was used to study the cavity morphology in different cavitation stages. The lift resistance of the airfoil was measured and the spectrum was analyzed. The results show that during the cloud-like cavitation phase, the quasi-periodic changes of cavitation -development-exfoliation-collapse are observed and the U-shaped holes and airfoil attached to the front of the airfoil are captured On the different strength of the reverse jet; vacuoles from the front of the airfoil swirling shedding. The lift obtained by FFT transform the corresponding spectrum, the hole shedding frequency was 24.3Hz.