Investigation on hydraulic characteristics of the regenerative flow pump in on-orbit filling based on energy exchange
Owing to the large volume and poor reliability,the traditional positive displacement pump in on-orbit filling is hard to satisfy the requirement of light weight and strong reliability for circulating filling pump.Therefore,the regenerative flow pump(RFP)structure,which possesses the character-istics of low flow rate and high head,was proposed to explore the variation rules of RFP's hydraulic performance under the on-orbit filling environment,further to reveal the energy exchange mechanism in combination with the internal flow field.The results illustrate that,the longitudinal vortex guides the circulation flow inside RFP to complete energy exchange process,making the RFP's performance present different variation tendency under different factors.With the rotating speed increasing,the density of the conveying medium decreasing,the dynamic viscosity of the conveying medium increas-ing,and the air content decreasing,the pressure growth rate of RFP was accelerated.The exchange flow between the pump channel and impeller is more intense,the intensity of the longitudinal vortex is stronger,the work capacity of the pump is enhanced,and the RFP's head is increased.However,due to the existence of the dissipation loss,the changing trend of hydraulic efficiency is opposite.
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