Internal Flow Field Analysis Of Hydraulic-spring Buffer

Lack of research on the internal flow field of spring-hydraulic buffers and inaccurate in the selection of hydraulic resistance coefficient,which restricts the development of the spring hydraulic buffer to some extent.For the internal fluid flow of the hydraulic-spring buffer when the artillery is recoiling,based on the theory of fluid dynamics and the rules of actual recoil,use profile driven mechanism?Spring-base smoothing and Re-meshing technology to form dynamic mesh technique.Using fluent to establish a three-dimensional simulation model that simplifies and evaluates the quality of the mesh,and the numerical simulation of the internal fluid flow of the hydraulic-spring buffer is carried out.The results show the distribution of liquid flow rate,pressure and velocity vector in the buffer,revealing the law and characteristics of the liquid flow in the hydraulic-spring buffer,providing support for the design and fault analysis of the hydraulic-spring buffer.At the same time,based on the simulation results,the overall hydraulic resistance coefficient of the hydraulic-spring buffer is calculated and fitted,which provides a reference for the hydraulic resistance coefficient of the hydraulic-spring buffer.Finally,the simulation compares with the maximum hydraulic resistance obtained after the test.,the error is 10%,and the simulation results basically meet the requirements.Considering the influence of temperature on the internal flow field of the hydraulic-spring buffer,establish and solve the simulation model of the internal flow field of the spring hydraulic buffer at-30 °C,20 °C and 50 °C.The analysis results show that the difference of temperature has a significant effect on the internal flow field and its distribution of the buffer.The increase of the working temperature of the oil causes the flow velocity at the sag flow hole and the throttle hole to slow down,and leads to the decrease of the pressure of the hydraulic oil in the I chamber and the hydraulic resistance coefficient K.Considering the influence of the recoil hole on the internal flow field of the spring hydraulic buffer,build the simulation model of 2,3,4 recoil holes,4mm,5mm,6mm diameter recoil fluids into the internal hydraulic basin of the spring hydraulic buffer and solve it.The analysis results show that the number of recoil holes has little effect on the hydraulic resistance coefficient K.The decrease of the diameter of the recoil hole directly leads to the increase of the hydraulic resistance coefficient K,and the smaller the diameter of the recoil hole decreases,the more obvious the effect of increasing of the coefficient K.