Numerical Simulation And Experimental Study Of Internal Flow Field In Impact Food Crusher

Impact food crusher has been being the focus on the chamber research for its simple construction, easy maintenance and repair, and environmental protection .So it has an extremely wide application prospect. Since its introduction time is short, domestic researchers have taken research on broken mechanism from the aspect of machinery mainly, but few research on flow filed has been reported, particularly the effect of the characteristic parameter of the crush room on turbulent kinetic energy and energy consumption etc.This paper is researched on the Working principle from the wet grinding method .In order to make foundations of the study on the theory of liquid-solid two-phase flow in the crush room and optimizing design aiming at domestic diet habit. The author retrofitted impact crusher on the basis of other scholars' study ,and do numerical simulation and experimental research to the internal liquid-solid two-phase flow fields .The main works and conclusions are showed as following:1. Present research states of Impact food crusher and liquid-solid two-phase flow were introduced simply. A model crusher, which met the measurement needs was designed and manufactured based on the methods.2. Pro/E was applied to sculpt the model crusher. The unstructured grids were generated in the area of flow passage in the crusher.3. Euler multiphase flow model and modified k-εturbulent model were adopted to simulate internal liquid-solid two-phase flow field at different rotate speed of crusher. Axial cross-sections and regions were plotted to locate every measure point and display the results for comparing with the measurement results. Conclusions were obtained such as that "broken effect has improved with the increasing rotation rate".4. Measuring means on internal flow of rotating machines with Phase Doppler Particle Analyzer (PDPA) were introduced.5. Experimental set were designed. The internal liquid flow field in model crusher was measured by PDPA made by Dantec in Danmark.6. Circumferential, axial velocities and relative fluctuate velocities were analyzed. Conclusions were proposed such as "outside 0.6R, which is the main crush area" .