不同转速工况下喷水推进泵的空化流动试验研究OA

In order to study the cavitation flow phenomenon and interference mechanism of vortex structure of water-jet pumps at different rotational speeds,this paper obtained the cavitation performance curves of water-jet pumps at different speeds based on the cavitation performance test of water-jet pump closed test bench at different speeds,and obtained the visualization pictures of cavitation vortex structure of water-jet pumps at different rota-tional speed conditions and different cavitation development degrees by high-speed photography technology.The evolution law of cavitation vortex structure of water-jet pumps with cavitation development at various rotational speeds was analyzed,and the influence of speed on the evolution of cavitation morphology of water-jet pumps was discussed.The results show that the reduction of speed increases the NPSHa value range of water-jet pump cavita-tion development and delays the cavitation development process of water jet pumps.At the same time,the reduc-tion of speed weakens the effect of mainstream on vortex structure,changes the cutting frequency of blades on cavi-tation vortex structure,and forms differences in motion displacement and collapse point position of cavitation flow structure at different rotational speed conditions.