Finite Element Analysis On Fluid Parameters Disturbance In The ESP Impeller With A Convex Defect Inside The Flow Channels

In this paper, in order to figure out the influence of hydraulic structure change on flow channel to the fluid field inside the passage, Single-staged enclosed cylindrical type of submersible electricity pump impeller was modeled using Gambit, and Impeller passage flow field was simulated using fluid simulation software Fluent. Standard k ?? turbulence model was used to simulate the flow field inside the impeller passage with a convex defect in. The influences factors of the channel’s velocity magnitude, such as the flow rate of the impeller, the size and location of the convex defect, the shape of the defect, etc, were researched. The simulation result was compared to the theoretical analysis results According to the boundary layer theory and fluid principle of parallel lines. The limitations and deficiencies of the original theoretical analysis results was completed and perfected, and also verifies the correctness of the theory of the original model.When the convex defect front to greet fluid, the length of the wake zone formed after the defect is concerned to the size of the windward area and the velocity of the fluid. The length of the wake zone is shortened when there is a high velocity rate, the length of the wake zone is lengthen when the windward area is enlarged. The drag coefficient is bigger while the length of wake zone is lengthened. The drag coefficient and the local velocity of the defect location reveal the fluid dynamic pressure loss, which determines the distribution of the flow channel flow of the impeller. Beneficial results were get through simulations and analysis on the relationship between the flow rate changes with defect’s windward area, position and shape. The results show that the influence of flow distribution is essentially the same during the changes in the radial position of the defect when the convex defect located in the low-speed zone, have a greater change when the defect is in the center of the channel and located in the high-speed zone; Under the condition of the same flow channel occupancy, the influence of flow distribution is not so different during the offset angle changed when the defect are not so big, and when the defect are getting bigger, the influence will be greater; The influence of flow distribution is related to channel occupancy, into a quadratic relationship; The influence of flow distribution caused by the quadrangular prism defect is greater than one caused by a cylinder defect when both of them have same channel occupancy; The change of impeller inlet flow rate does not alter the distribution of the velocity field in the flow field, but should have changed the relative velocity on each point.Use the flow measurement base on the connection of hydrodynamic pressure and fluid velocity. fluid impact pressure sensor, the sensor reading greater when the flow have a high momentum. In order to obtain high measurement sensitivity, pressure sensors should not be too far away from the discharge outlet, overflow outlet should be as small as possible to increase the resistance of the flow that more kinetic energy may be consumed by the impact to the face of the pressure sensor.