Simulation And Research Of Flow Field Of Hydraulic Impactor

First, the latest research and development trend with some basic ideas, applications about hydraulic hammer were presented in the paper, after which the type air-and-fluid hydraulic impactor was the research object, founded the two-dimensional and three-dimensional model of this hydraulic impactor, analyzed the working princes and introduced the main parameters. By establishing the mathematical model of the hydraulic impactor system, researched how the parameters affected the working performance of impactor. Used the simulation software of MATLAB/Simulink, did research into the simulation of two processes which includes the accelerated return stroke and travel stroke of a hydraulic impactor, and made an in-depth analysis that is nitrogen pre-charge chamber pressure on the percussion and performance level of in-depth analysis. The results showed that:if the pre-charge pressure of nitrogen chamber is too large, it will result in hydraulic fluid could not move the piston to return, hydraulic impactor can not start up; if the pressure is too small, it will easily induce to difficult rise the impacting pressure, and the impacting energy will be small.Based on reading and studying a great number of references about fluid dynamic technique, numerical computing methods of flow field, visualization technique in fluid field ect, respectively established the geometry model of the impactor’s pipe and the shuttle valve by using the software of AutoCAD and CATIA; then used the processing software GAMBIT to have a grid. By using the FLUENT software which was belonged to the CFD analysis software, simulated the flow field of complicated flow channel and throttle of shuttle valve by using the Finite-Element method. And the computing results are given in the form of visualized pictures, based on these results, analyzed the relations between the fluid velocity, streamline, vortex and fluid energy loss.In this paper, by numerical simulating the flow field of the right bend channel and eccentric intersected channel, obtained respectively the results which included the visualized pictures about pressure contour, velocity vector and streamline, and pointed out the location and extent of vortex which was produced by the fluid flowing. Had the curve about the flow and the pressure loss of the right channel through the numerical simulation of fluid flow.In this paper, expounded the working characteristics and working of the slide-shuttle valve, integrating its working characteristics selected the fluid control volume and defined the border conditions of research region. Simulated the change of flow field structure which was produced in the working processes of shuttle valve, qualitative analyzed the cause of the energy loss of shuttle valve.The study for the hydraulic impactor has offered the significant reference to the structure designing and performance optimization, and would be provide guidance for design and development of the hydraulic impactor.