旋转圆盘内不同转速的空化特性研究

Study on Cavitation Characteristics of Different Rotational Speeds on Rotating Discs

为了研究不同转速对旋转圆盘空化性能的影响,以卧式旋转圆盘试验装置为例,建立全流道几何模型,使用CFD数值模拟软件,模拟不同转速工况下的情况,对结果进行分析表明:随着转速的上升,在旋转圆盘空蚀源和试件之间的压力降低,同时低压面积增大,低压区越靠近空蚀源压力越低,其空化越严重;当转速为2000r/min时,旋转圆盘空蚀源外边缘开始出现空化,随着转速的上升,旋转圆盘上出现空泡的面积不断扩大,而且越靠近空蚀源边缘,空泡体积分数越大。定义了旋转圆盘空化系数并得到了旋转圆盘转速n与空化数σ关系曲线,随着转速的上升,空化数σ不断降低。

In order to study the effect of different rotational speeds on the cavitation performance of rotating discs,this paper took a type of horizontal rotating disk as an example,established the full-flow-path geometric model,used the CFD numerical simulation software to simulate the situation under different speed conditions and analyzed the results,and plotted the rotational speed n and cavitation number σ curve of the rotating disk.The results show that with the increase of rotational speed,the lower pressure on the left side of the rotating disk cavitation source is low,the area of the lower pressure is larger,and the lower the pressure is near the cavitation source in the low pressure zone, the more serious the cavitation is.When the rotational speed is 2 000 r/ min,or σ=0.232,cavitation begins at the outer edge of the rotating disc cavitation source.As the rotation speed increases,the area of the bubble appearing on the rotating disc is continuously expanding,and the closer to the edge of the cavitation source,the darker the color,and the larger the bubble volume fraction generated,the more serious the cavitation is draw rotation speed n and cavitation number σ curve.The cavitation number σ is decreasing,while the cavitation number is smaller,the cavitation is more serious.