Numerical Simulation And Experimental Analysis Of Flow Field In Centrifugal Nozzle

In this paper,a new type of tangential orifice centrifugal nozzle was selected as the research object.This type of nozzle is currently less studied and widely used in modern life(such as landscape spraying,atomizing dust removal,spray cooling).This paper studies the flow field inside the nozzle by setting different working pressure parameters and structural parameters and using a combination of experimental and simulation methods.It provides a useful reference for improving the performance of nozzle atomization parameters.In this experiment,the exit aperture of the nozzle has been set to three parameters(0.2mm,0.3mm,0.4mm),the tangential groove width has been set to three parameters(0.21 mm,0.26 mm,0.31mm).This paper sets a total of nine different parameters of the nozzle,and then uses the built-in centrifugal nozzle experimental system to measure the spray cone angle,atomizer particle size and other characteristics of the above-mentioned nine kinds of nozzles.At the same time,CFX solver was used to simulate the flow field inside the nozzle.The results show that although the numerical simulation results and experimental data have certain errors,but the general trend is all the same.As the pressure increases,the atomizer cone angle will slowly increase,even some cone angles will reduce.the atomizer cone angle maintains a steady state as a whole,while the atomized particle size will gradually reduce;As the groove width increases,the atomization cone angle firstly increases and then decreases,and the change trend of atomized particle size is not obvious;As the exit aperture increases,atomization cone angle and atomization particle size all increase,however,the changes of the exit aperture will also cause the changes of other parameters,it is difficult to quantitative analysis,it can only say that the exit aperture have some impacts for the atomization particle size and the atomizer cone angle;According to the experimental data and numerical simulation results,this paper chooses No.2026 nozzle as the best atomization nozzle performance.