Numerical study of cavitating effects on posterior taper
angles of tandem cavitation chamber

DAI Yong, YE Jian-ling, GE Man, LOU Fei-yan

                                            (College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

Abstract: Aiming at the existing problems of cavitation strength and efficiency of tandem cavitation chamber, a numerical study of the posterior taper angle β with large influence was put forward, which provided the theoretical basis for the future design of cavitation chamber. Based on the Mixture multiphase flow model and the k-ε two-equation turbulence model, a series of cavitation chambers with continuous taper angle β values in the Fluent software were simulated. The concours of the pressure, velocity and vacuolar volume fraction in the calculated results were extracted to analyze and study the effect of the posterior taper angle β on the cavitation flow field. The results indicate that the cavitation phenomenon with relatively high strength can be obtained near the 15° of the posterior cone angle β, and the size of the vacuolar volume, the size of the negative pressure and the ability to maintain a constant velocity along the central axis are positively correlated relationship. The posterior taper angle β value directly affects the distribution of the cavitation flow field, which determines the range of the ultimate injection to the surface of the workpiece.
Key words: tandem cavitation chamber; cavitation phenomenon; vacuolar volume; posterior taper angle