燃气轮机离心式燃油雾化喷嘴仿真

Simulation of Centrifugal Spray Nozzle for Gas Turbine

开展离心式燃油喷嘴雾化仿真研究,为燃气轮机燃烧提供依据。利用Solidworks、ANSYS ICEM CFD软件进行离心式喷嘴外场建模和网格划分,基于FLUENT仿真完成不同压力工况下瞬态离心式喷嘴外流场数值模拟计算。对离心式喷嘴在无辅助空气作用下和有空气辅助作用下的外流场进行了数值模拟研究,分析其在13个压力点工况下(0.05 MPa、0.1 MPa、0.3 MPa、0.5 MPa、1.0 MPa、1.5 MPa、2.0 MPa、2.5 MPa、3.0 MPa、4.0 MPa、5.0 MPa、6.0 MPa、7.0 MPa)的雾化液滴分布以及性能参数的结果。研究表明:在无空气辅助下,喷嘴的雾化液滴分布都呈圆锥状分布,喷嘴在压力点工况下的整体索太尔平均直径(SMD)以及不均匀度的极大值(极小值)分别为414.54μm(40μm)、0.6709(0.4874);在3个不同空气压力下(10 kPa、14 kPa、20 kPa),喷嘴的雾化液滴分布都呈圆锥状分布,喷嘴在压力点工况下的整体SMD以及不均匀度的极大值(极小值)分别为35.93μm(15.67μm)、0.8387(0.7040)。本文的仿真研究为离心式燃油喷嘴应用到燃气轮机燃烧中提供了依据。

In this work,Solidworks,ANSYS ICEM CFD were used to model and mesh the external field of the centrifugal nozzle,the transient external flow fields of the centrifugal nozzle under different pressures were numerically simulated by using FLUENT.To study the effect of auxiliary air on the flow fields,the distribution of the spray droplet and performance parameters under 13 pressure conditions(0.05 MPa,0.1 MPa,0.3 MPa,0.5 MPa,1.0 MPa,1.5 MPa,2.0 MPa,2.5 MPa,3.0 MPa,4.0 MPa,5.0 MPa,6.0 MPa,7.0 MPa)were studied.It is found that the spray droplets showed a conic distribution under the non-air auxiliary condition where the Sauter mean diameter(SMD)and the maximum(minum)value of non-uniformity were 414.54μm(40μm)、0.6709(0.4874)respectively.With the effect of air auxiliary,the spray droplets exhibited cone like distribution where the Sauter mean diameter(SMD)and the maximum(minum)value of non-uniformity were 35.93μm(15.67μm)、0.8387(0.7040)respectively.This work provides a reference for the application of centrifugal fuel nozzle for gas turbine.