Numerical Simulation For Law Of Flow Field Nearby Muzzle Of Abrasive Water-jet

The main contents of this article is concerned with the applying of water jet and general researching situation of numerical simulation of two phase flow of solid–liquid , introducing the methods of numerical simulation researching and that of theory researching, elaborating continual medium theories of two phase flow of the solid-liquid. On the basis of two phase flow of the solid-liquid, we establish the mechanical model of abrasive jet, and adopt standard k ?εturbulent model to solve pressure velocity couple. After particular analysis over the rules of flowing at the neighborhood of muzzle, several conclusions as follows are on horizon: At contract section of the muzzle, the acceleration of water flow is very large, and velocity of water flow nearly reaches the maximum value, then the procession of accelerating will continue until coming to the outlet. While at the neighborhood of the mouth, the velocity is equivalent, and this zone is called core area; the granule velocity is far below that of water, and the abrasive material is still on acceleration at initial section after dashing away the mouth; in order to get a good implying effect, the range of target should not be too large, and within the zone of 5~8D away muzzle; Generally it is considered right that the larger granule volume fraction is, the better engineering application will be. Through the numerical simulation of the flow field, a few results can be given as follows: within a certain degree, the larger supplying of abrasive is, the greater speed of jet will be; when the supplying quantity reach a optimum value, the velocity will reduce if succeeding in raising the quantity of the granules; compared with dynamic pressure of single-water jet, that of abrasive jet win a big rise evidently, and effect of engineering application will get enforced greatly.