燃气轮机排气管引射效能仿真及优化

Research on the optimization of the marine gas turbine exhaust pipe for improving ejector coefficient by numerical simulation method

针对实船环境下的燃气轮机排气引射效能问题,采用数值仿真方法,开展以提高引射系数为目的燃气轮机排气管路优化设计。通过构建包含燃气轮机本体、箱装体和排气管路的排气引射数值仿真模型,开展排气管多方案仿真,分析混合段与扩压段长度比、垂直管路长度、扩压段后排气管通径对引射效能的影响,综合考虑排气管路总体布局、阻力限制、重量控制等因素,提出排气管的优化设计方案。仿真结果表明该方案可明显提高引射系数,满足燃气轮机规定的引射空气量要求。该研究可为燃气轮机排气管路的设计和工程实践提供参考。

Aiming at the problem of gas turbine exhaust ejection efficiency in real ship environment, the optimization design of gas turbine exhaust pipe was carried out by using numerical simulation method to improve the ejection coefficient.Through building the numerical simulation model which contains gas turbine noumenon, the box body and exhaust of the exhaust ejector, the simulation for the exhaust pipe schemes were carried out. The simulation results were compared by analyzing the mixing section and the diffuser length ratio, vertical pipe length, diffuser exhaust pipe diameter road after the impact on the ejector performance. The optimization scheme of the exhaust pipe was put forward by generally considering the layout, the resistance restriction and the weight control of the exhaust pipe. The simulation results show that this scheme can obviously improve the ejection coefficient and meet the requirement of gas turbine ejection air volume. This study can provide reference for the design and engineering practice of marine gas turbine exhaust pipe.