Research on resistance characteristics and internal backflow of submerged waterjet propeller duct
In order to analyze the resistance characteristics of a typical submerged waterjet propeller duct under the structure of individual duct and integrated structure of hull and duct,and examine the effect of vortex generators on improving internal flow separation,the analysis was focused on the effects of installation direction and angle of the vortex generator on flow control.The results show that the pressure loss coefficient of the duct increases from 3.42 to 3.73 under an incoming flow condition of 15 m/s due to the significant influence of the hull bottom structure on resistance characteristics after the duct and hull are integrated.Divergently arranged vortex generators effectively suppress the flow separation in the top part inside the duct and reduce the pressure loss resistance on the duct's external wall by 58.4%,thereby significantly improving the duct's resistance performance.An appropriate installation angle of 15° for the vortex generators not only can control internal flow separation,but also enhance the duct's resistance performance while maintaining uniformity of flow field at the inlet.These findings provide a theoretical basis for the design of submerged waterjet propulsion systems.
submerged waterjet propulsiondrag characteristics of ductflow separation inside the ductvortex generator
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