环境风对燃气轮机通风系统影响的数值模拟研究

Numerical Simulation Study on Effect of Ambient Wind on Gas Turbine Ventilation System

工业燃气轮机在全封闭的箱装体中运行时,需要设置通风系统。当外界环境风速较高时,会对通风系统的进口和出口条件造成影响,进而影响燃气轮机通风系统的整体性能。本文以某型燃气轮机通风系统为研究对象,采用数值模拟方法,研究不同风速(0.5~55.2 m/s)和风向(顺风、逆风、侧风)对通风性能的影响,并与现场实际测得的数据进行对比,验证数值模拟方法的准确性。通过分析不同风况下的结果发现,当机组侧向来风时对通风性能的影响较大。对此的解决方案为将迎风一侧的排风口封死,使通风系统单侧排风。计算结果表明:这种方案可保证通风系统在7级风以上情况下以额定工况的76%继续工作。

When industrial gas turbine is operating in totally-enclosed acoustic enclosure,a ventilation system set-up is needed.High-speed external wind will affect the inlet and outlet conditions of the ventilation system,and further influence the overall performance of the gas turbine ventilation system.Numerical simulation has been done for the gas turbine ventilation system to investigate the influences of different wind speeds of 0.5 m/s to 55.2 m/s and wind directions of downwind,upwind and sidewind on ventilation performance.The results are also compared with the actual measured data on site to verify the accuracy of numerical simulation.Through the analysis of the results under different wind conditions,it is found that the ventilation performance is greatly affected when the unit faces the wind laterally.The practical solution is to seal the ventilation outlet duct on the windward side,so that the ventilation air can be exhausted from the other side.It turns out that this scheme can guarantee that the ventilation system continues to work with 76%performance of rated working condition under level 7 wind or above situation.