Calculation and test verification of gas-solid coupling pneumatic transport of hail continuous ejection
Considering the gas-solid two-phase flow problem of compressible pneumatic transport of large particles,the coupling calculation method of computational fluid dynamics(CFD)and discrete element method(DEM)was established.The flow field distribution in the hail ejection pipe was calculated by computational fluid dynamics,while the force and motion of hail were calculated by discrete element method according to aerodynamic parameters.When measuring hail velocity,a special measurement section was required to be installed at the outlet of the ejection tube.The difference between the measurement configuration and the open configuration was then compared and calculated.The results showed that the calculation results under the measured configuration were basically consistent with those under the open configuration,so the calculation and test under the measured configuration can support the design of continuous hail throwing device.Through the comparative calculation and test verification under three particle resistance models,the hail velocity calculated by Ergun model and di model was larger,and the hail velocity calculated by free flow resistance model was closest to the test measurement results.The calculated hail velocity differs by 8.9％from the test results,playing a guiding role in the design of hail continuous ejection device.
NETL
NSTL
万方数据
