Numerical simulation study on the internal flow field of aviation fuel jet pump

Numerical simulation methods are used to analyze the internal flow field of an aviation fuel transfer jet pump, studying the impact of varying inlet operating pressures of motive flow on its performance and revealing the flow characteristics of its internal three-dimensional field. Results show that increasing inlet operating pressure extends the core jet range, optimizes the mixing of two fluid streams in the throat and diffuser, and improves overall flow field quality. The increase in pressure enhances the suction capacity of the jet pump, resulting in nearly a 53% increase in the flow rate of case 5 compared to case 1. Two intense vortex flows form in the suction chamber, with one portion of the vortex flow passing directly through the throat inlet, accelerating the fluid velocity along the upper wall and creating an asymmetric flow. Another portion strikes the lower wall beneath the nozzle and before the throat, generating secondary vortex flows and squeezing the ejected fluid.