| The jet pipe servo valve is a component that sprays oil from the jet nozzle,and distributes the flow of the two receiving holes through the receiver to obtain the pressure difference to drive the movement of the valve core.Because of its strong anti-pollution ability and high reliability,it is widely used in aviation,steam turbine,nuclear power and other fields.The jet tube amplifier is used as the pre-stage of the jet tube servo valve,and its flow field characteristics directly affect the performance of the entire servo valve.With the continuous advancement of research methods,more and more efficient methods are provided for the design and performance analysis of jet tube servo valves,which greatly reduces research costs and improves research efficiency.This paper uses theoretical analysis,numerical simulation,PIV particle imaging velocimetry technology and pressure measurement system to investigate the flow and pressure field of the servo valve in the state of tilting(relative to the swing of the fixed reference plane(vertical))of the jet tube.Taking the CSDY jet tube servo valve as an example,the distribution relationship of the receiving hole area of the servo valve under the slanting state of the jet tube is analyzed theoretically.By changing the spacing distance of the left and right receiving holes,the diameter of the receiving hole and the Nozzle diameter,the influence of each structural parameter on the change of coverage area under the state of jet tube oblique swing is obtained.The influence of the change of the receiving area of the left and right receiving holes on the pressure characteristics is explored.The simulation model of the servo valve pre-stage in the slanting state of jet pipe is established,and performed mesh division,boundary condition setting and mesh quality inspection,and studied the changes in the flow field and pressure field of the servo valve pre-stage under different oblique angles According to the results,the influence of the oblique swing of the jet tube on the performance of the servo valve pre-stage is analyzed.Using the Reynolds similar principle to design the servo valve pre-stage experimental model under the jet tube oblique swing state,use the pressure probe technique and PIV technology to measure the pressure and flow field of the jet impact gap flow field,and analyze the servo valve under different tilt angles with flow field characteristics.Through vorticity analysis and POD(Intrinsic Orthogonal Decomposition)analysis of experimental results,the evolution of the flow vortex system and the relationship between fluid energy distribution and tilt angle are discussed.Through the research in this paper,the influence of the jet tube on the flow field and pressure characteristics of the servo valve’s pre-stage under the slanting state is clarified,which provides theoretical guidance for the design,processing and assembly process of the jet pipe servo valve. |
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