大型燃气涡轮叶片冷却技术

Blade Cooling Technology of Heavy-duty Gas Turbines

近年来,随着大型燃气轮机性能的不断提高,为进一步减少有效气体的消耗,提出了汽雾两相流冷却方案,即涡轮叶片由空气冷却逐渐转向空气和蒸汽双工质冷却,现已日益成为研究的热点。大量研究表明,汽雾冷却具有冷却快、冷效高、流阻小和结构简单等优点,将在下一代高性能燃气轮机的涡轮叶片冷却中发挥重要作用。通过对带冲击气膜结构冷却的数值模拟,平均冷却效率明显提高,且低温区明显延长。

In recent years heavy-duty gas turbine performance has undergone a continuous improvement.To further reduce the consumption of effective gases,the authors have proposed a steam-mist two-phase flow cooling scheme,under which turbine blades are cooled by mist-and-steam dual working media instead of air.The scheme in question has become the focus of study with each passing day.A great deal of research shows that the steam-mist cooling method enjoys a variety of merits,such as quick cooling,high cooling efficiency,small flow resistance and simple configuration etc.,which will play a major role in the cooling of turbine blades of next-generation high performance gas turbines.A numerical simulation of the cooling process in an impingement gas-film structure has identified a significantly higher average cooling efficiency with the low temperature zone being extended remarkably.