燃气轮机双燃料喷嘴燃油内流场特性仿真分析

作为燃气轮机中的重要部件，喷嘴内部结构直接决定了燃油燃烧和动力输出效率，设计喷嘴结构并开展喷嘴中内流场特性仿真分析成为新型燃气轮机开发的研究重点。使用Solidworks软件对双燃料喷嘴结构进行设计，并对其燃油流道进行数值模拟。利用Fluent软件先对喷嘴燃油的整体内流场进行数值k-epsilon模拟，再使用流体容积法（VOF）方法对喷嘴燃油的核心流道进行数值模拟，研究喷嘴燃油流道的特性。结果显示燃油流道的质量流量、进口流速和核心流道进口流速随着进口压力的增大而增大；雾化锥角会随着进口压力的增加而增大，且当进口压力超过0.5 MPa时，雾化锥角最终会稳定在110°左右；同时结合相关实验数据与仿真数据进行对比。本文的仿真研究为燃气轮机喷嘴的结构改进提供了依据。

Inner Flow Field Characteristics Simulation of the Dual Fuel Nozzle of Gas Turbine

As an important part of the gas turbine, the internal structure of the nozzle directly determines the fuel combustion and power output efficiency. The design nozzle structure and simulation analysis of the fuel flow field characteristics in the nozzle has become the research hotspot for the development of new gas turbine. The Solidworks software were utilized to design of dual fuel nozzle structure, and numerical simulation of the fuel flow path. Then, the flow characteristics of fuel nozzle were investigated. The Fluent software was used to do the numerical k-epsilon simulation of internal flow field for the fuel nozzle, and the numerical Volume of Fluid (VOF) method was used to simulate the core flow path of the nozzle. The results show that the mass flow rate, inlet flow rate and core flow inlet flow rate of the nozzle model increase with the increase of the inlet pressure. And the atomization cone angle will increase with the increase of the inlet pressure, the atomization cone angle will eventually stabilize at about 110° when the inlet pressure exceeds 0.5 MPa. Combine relevant experimental data with simulation data. The simulation study in this paper provides a basis for structural improvement of gas turbine nozzles.