进口流量对水力旋流器分离性能及内部流场和浓度场的影响OA

[Objective]With the rapid development of society and population growth,the volume of process wastewater requiring treatment in water treatment plants(WTPs)has increased sharply.Meanwhile,existing treatment technologies and methods for this process wastewater present certain challenges.Therefore,there is an urgent need to conduct research on hydrocyclone separation technology for treating process waste water from WTPs.[Methods]Through pilot-scale experiments,this paper utilized a particle image velocimetry(PIV)system to systematically investigate the influence of inflow rate on the separation performance,internal flow field,and concentration field of the hydrocyclone.[Results]As the inflow rate increased,the underflow concentration ratio initially rose and then declined.With the experimental setup used in this paper,the underflow concentration ratio reached a maximum value of 2.57 at an inflow rate of 2.3 m3/h.Meanwhile,the maximum tangential velocities at section Ⅰ and section Ⅱ attained peak values of 2.589 m/s and 1.337 m/s,respectively,when the inflow rate was 2.6 m3/h.[Conclusion]An increase in inflow rate adversely affects the separation of fine particles,whereas appropriately increasing the inflow rate enhances the separation of larger particles.The tangential velocity of the fluid within the hydrocyclone increases with the inflow rate,while the radial velocity shows no clear correlation with changes in the inflow rate.Regarding axial velocity and particle concentration,as the inflow rate increases,the axial velocity tends to rise near the central axis,whereas the particle concentration decreases.