3D打印燃气轮机天然气喷嘴的流场仿真分析

Flow Field Simulation of 3D Printed Natural Gas Nozzle for Gas Turbine

开展3D打印天然气喷嘴流场仿真研究,为小型化燃气轮机控制技术的提升奠定基础。利用Solidworks、ANSYS ICEM CFD软件进行3D打印天然气喷嘴模型建模和网格划分,基于FLUENT仿真完成不同压力工况下稳态天然气喷射流场的数值模拟计算。在天然气喷嘴外流场中形成的几何回流区会随着供气压强的增大而消失,中心回流区会随着工况压力的增大而逐渐向下游区域移动;天然气喷嘴的体积流量会先随着供气压强的增大而增大,供气压强大于0.15 MPa时体积流量逐渐饱和趋于平缓;质量流量随着压力工况的增大而呈线性增大;在距离喷嘴出口70mm处的不同压强工况下的不均匀度小于0.37。从仿真上研究天然气的分布以及气流的流动特性为3D打印喷嘴安全稳定运行及合理组织流场提供参考依据,为3D打印技术在燃气轮机制造中的应用提供了理论基础。

This paper investigated the flow field simulation of 3D printing natural gas nozzle,which laid a good foundation for the development of controlling technique for gas turbine.The Solidworks software was utilized for the modeling and grid mesh generation of gas nozzle,and the numerical simulation of steady flow field was done to study the ejection behaviors of natural gas nozzle under different conditions by using ANSYS ICEM CFD software.The geometric recirculation region formed in the external flow field of the natural gas nozzle disappeared with the increase of the gas pressure,and the central recirculation region gradually moved to the downstream zone with the increase of supply pressure.In addition,the results revealed that with the increase of the gas pressure,the volume flow of the natural gas nozzle would increase first,and gradually become gentle at 0.15MPa;the mass flow rate increases linearly with increasing pressure conditions;the non-uniformity of the mass flow rates at the point of 70mm from the nozzle outlet under each working condition is less than 0.37.The distribution of natural gas and the flow characteristics of the gas flow provide a reference by simulation research for the safe and stable operation of the 3D printing nozzle and the reasonable organization of the flow field,which provided a theoretical basis for the application of 3D printing technology in gas turbine manufacturing.