Engineering Technology

CLC number: V231.2

Research on the Fuel Flow Distribution of Nozzles of the Fuel Injection Rings in Micro-Turbojet Engines

微型涡喷发动机喷油环喷嘴燃油流量分布研究

¹ School of Automotive and Transportation, Shenzhen Polytechnic University, Shenzhen 518055, Guangdong, China (深圳职业技术大学　汽车与交通学院，广东　深圳　518055)
² School of Aircraft Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, China (南昌航空大学　飞行器工程学院，江西　南昌　330063)
³ School of Electrical Engineering, Nanchang Institute of Technology, Nanchang 330099, Jiangxi, China (江西水利电力大学　电气工程学院，江西　南昌　330099)

Received: 21 October 2024

Abstract

The injection ring is a critical component for supplying fuel to the combustion chamber of an engine. The performance of the engine is directly affected by the uniformity of the outlet fuel flow distribution of the nozzle. To address the issue of the uneven outlet fuel flow distribution of nozzles of the injection ring, this paper uses the ANSYS Fluent for numerical simulations. The fuel flow values at each nozzle outlet of the injection ring and the pressure drop between the inlet and outlet were calculated, and the influence of inlet flow and nozzle inner diameter on the fuel flow distribution and the pressure drop between the inlet and outlet were analyzed. The research results indicate that reducing the nozzle inner diameter and increasing the inlet flow lead to a more uniform fuel flow distribution at the nozzle outlets. Additionally, decreasing the nozzle inner diameter increases the pressure drop between the inlet and outlet. The Leiting LT70 micro-turbojet engine discussed in this paper is compatible with an injection ring with a nozzle inner diameter of 600 μm.

摘要

喷油环是为发动机燃烧室供给燃油的关键部件，喷嘴出口燃油流量分布的均匀性直接影响发动机性能。针对喷油环喷嘴出口燃油流量分布不均匀的问题，本文采用ANSYS Fluent软件进行数值模拟，计算得到喷油环各喷嘴出口的燃油流量值及进出口压降，并分析了进口流量和喷嘴内径对燃油流量分布及进出口压降的影响。研究结果表明：减小喷嘴内径、增大进口流量，可使喷嘴出口的燃油流量分布更加均匀；此外，喷嘴内径减小会导致进出口压降增大。本文所研究的雷霆LT70微型涡喷发动机适配喷嘴内径为600μm的喷油环。