| Because of its simple structure and good characteristics of atomization,pressure swirl nozzles are widely used in industrial production.The nozzles studied in this paper are used in horizontal pipe falling film evaporator,the critical equipment of desalination technology.The atomization effect of the nozzle directly determines the working efficiency of the evaporator.The internal flow field characteristics of the pressure swirl nozzle are studied experimentally and numerically.In this paper,a three-dimensional model was drawn according to the nozzle with a round diversion structure.A structured tetrahedral mesh was drawn using ICEM software.The VOF method and the realizable k-epsilon model were used in the FLUENT software.The calculation of the pressure and the nozzle cone angle with the inlet flow rate of the corresponding relationship.The experimental results were compared with the simulation results,and the accuracy of the selected model was verified.The experimental results show that the experimental results are in good agreement with each other.The internal flow field of the nozzle was analyzed by numerical simulation.The influence of the geometrical parameters of different structures on the spray characteristics was studied by changing the swirl chamber height,the inlet diameter.The diameter of the round diversion structure and the height of the round diversion structure.This paper verifies that the VOF method and the realizable k-epsilon model are suitable for this kind of flow,and the influence of the geometric parameters on the flow field characteristics of the pressure swirl nozzle was analyzed.Several dimensionless values of the maximum height of the swirl chamber,the inlet diameter and the height of the round diversion structure were obtained.Provides the direction to improve the nozzle geometry,get better atomization effects and improve production efficiency. |
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