关键词: 冲击射流, 颗粒物料, 喷距, 喷嘴直径, 滞点压强

Abstract: Aiming at the problem of using high-speed air jet to impact granular material layer, the parameter simulation model of high speed air jet is built by using realizable κ-ε turbulence model. The influence of nozzle diameter, jet distance on center axial velocity of jet is discussed on the basic of verifying the presented model feasibility, and the relations between jet distances, nozzle diameter and stagnation point pressure are obtained. The truck scale test platform of single-hole is established, and the experimental tests have been finished to obtain the relation curve between impacting mass and spray distance under different jet pressure. The process of using air jet to impact the iron granular layer is simulated by using the best spray distance length, which is obtained by experimental test. The mass distribution around the hole formed by jet impact is achieved by simulating method, and the variation of depth and diameter of hole with jet pressure is given. The results obtained by simulating are agreement with the test ones. It can provide guidance to use high-speed air jet to penetrate the granular material layer in the practical application.

Key words: granular materials, impinging jet, jet distance, nozzle diameter, stagnation point pressure