Effect of spool deflection on nozzle performance under large fitting clearance
The water nozzle,as the core component of the water distributor,is widely used in water injection oilfields.However,the water nozzle encounter jamming in practical applications,which cause the valve core to be unable to adjust properly,affecting the effectiveness of water injection.It is difficult to observe the details of valve core blockage and reproduce this phenomenon during the testing process.In order to reveal the mechanism jamming of water nozzle,the performance of the water nozzle was studied under different opening angles with large fitting clearance,eccentricity and inclination of the valve core.Firstly,a finite element model of the nozzle fluid domain was established using simulation calculations,theoretical flow characteristic and experimental flow characteristic were obtained to validate the accuracy of the finite element model.Then,an analysis was conducted on the flow characteristics and spool surface pressure features of the nozzle under various fit clearances,and the leakage during nozzle closure,axial and radial forces on the spool,and surface flow characteristics were obtainel.Finally,a genetic algorithm was employed to optimize the fit clearances.The research results indicate that large fit clearance cause the flow regulation rate curve to deviate significantly from the standard curve,significantly reducing the flow regulation rate.The radial and axial forces on the spool are maximized when the nozzle is fully closed.The leakage decreases by 84.56%when the fit clearance changes from 0.25 mm to 0.05 mm.Fit clearance has the most significant impact on leakage,followed by radial force and axial force.Optimizing fit clearances can reduce both leakage and radial force,while increasing eccentricity and inclination angles mitigates the risk of sticking,enhancing the operational reliability of the nozzle.
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