Numerical Simulation of the Influence of the Structural Parameters of a High Pressure Water Sector-shaped Nozzle on Its Internal Flow Field

By using a computational fluid dynamics software,established was a three-dimensional mathematical model for the internal flow field of a sector-shaped nozzle and a numerical simulation was performed of the nozzle under discussion by employing the standard k-e turbulent flow model.The influence of the main structural parameters of the nozzle on the velocity and pressure distribution as well as the jet flow speed was analyzed.It has been found that the convergence angle has a relatively large influence on the internal flow field of the nozzle,especially,the jet flow speed.The optimum convergence angle falls in a range from 13 to 15 degrees.The ratio of length to diameter at the outlet has a certain influence on both jet flow pattern and speed.When the blade height to diameter ratio is within a range from 2 to 4,it will be more favorable to the jet flow of the nozzle.The inclusive angle of the V-shaped groove has a relatively conspicuous influence on the jet flow speed at the outlet.When the inclusive angle is between 15 and 30 degrees,the nozzle displays a relatively good convergence nature but the jet flow speed is not high.When the angle is between 30 and 45 degrees,the nozzle can achieve a relatively good jet flow speed.When the angle is between 45 and 60 degrees,the nozzle can result in a high jet flow speed but a relatively poor convergence nature.