Experimental Study and Numerical Simulation on Spray Characteristics of New-Type Air-Assist Nozzle  

作　　者：Kun Liu Yonggang Yu Na Zhao 

机构地区：[1]School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China [2]Northwest Institute of Mechanical & Electrical Engineering, X ianyang 712099, Shanxi , China

出　　处：《Journal of Harbin Institute of Technology(New Series)》2016年第1期34-40,共7页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20113219110024)

摘　　要：To investigate the spray characteristics of a new-type air-assist nozzle,three-dimensional laser phase Dopper analyzer( PDA) was used to measure the spray parameters. The external flow fields of the nozzle were simulated by means of computational fluid dynamics( CFD). The distributions of the diameter and the axial velocity for the droplets were analyzed respectively. The results indicate that,the mean diameter of the droplets fluctuates along the center axis. The distance between the measurement point and the nozzle increases,the axial velocity of the droplets decreases. The further the measurement point from the center axis is,the smaller the axial velocity of the droplets is. With the increase of the nozzle pressure drop,the axial velocity of the droplets improves while the mean diameter of the droplets is reduced,and the distribution uniformity of the droplets is better for the diameter. The simulation result agrees well with the experimental data. The average deviation ranges from 3.9% to 7.7%.To investigate the spray characteristics of a new-type air-assist nozzle,three-dimensional laser phase Dopper analyzer（ PDA） was used to measure the spray parameters. The external flow fields of the nozzle were simulated by means of computational fluid dynamics（ CFD）. The distributions of the diameter and the axial velocity for the droplets were analyzed respectively. The results indicate that,the mean diameter of the droplets fluctuates along the center axis. The distance between the measurement point and the nozzle increases,the axial velocity of the droplets decreases. The further the measurement point from the center axis is,the smaller the axial velocity of the droplets is. With the increase of the nozzle pressure drop,the axial velocity of the droplets improves while the mean diameter of the droplets is reduced,and the distribution uniformity of the droplets is better for the diameter. The simulation result agrees well with the experimental data. The average deviation ranges from 3.9% to 7.7%.

关 键 词：air-assist nozzle SPRAY DROPLET numerical simulation 

分 类 号：V434.3[航空宇航科学与技术—航空宇航推进理论与工程]