Performance simulation of jet in deep-sea environment

The fluid dynamics simulation model of high-pressure jet nozzle which is adequate for deep-sea work is established.The performance of jet nozzle's internal and external flow field is numerically simulated and analyzed in deep-sea environment,the changes of jet's pressure and velocity which are in and after leaving from the nozzle in three typical confining pressure environments as 5MPa,10MPa and 15MPa are obtained,and then,it is comparatively studied with the performance of jet in non-submerged condition.The simulation result shows that:the performance of jet in deep-sea environment can be obtained by the numerical simulation and the simulation value is coincide with the theoretical value.The largest export velocity of nozzle declines correspondingly with the confining pressure increasing.The isokinetic core shape and the distance to the target which are formed by the jet nozzle under different confining pressure are almost the same,and the optimal spray distance is 3～5 times of the nozzle export diameter.Compared with the non-submerged condition,the axial velocity of jet nozzle attenuate rapidly in submerged condition,and the length of the isokinetic core is shorten by about 40%.