船用燃气轮机进气部件结冰规律研究

Research on the influence of icing on intake components of marine gas turbine

结冰会改变船用燃气轮机进气部件的气动特性,影响压气机工作效率。本文对船用燃气轮机进口导叶及导流罩进行二维结冰计算,以BP神经网络为基础,对船用燃气轮机进口导流罩的结冰临界温度进行预测。结果表明:结冰参数会影响部件表面冰形和结冰种类,从而影响部件的气动特性;特定条件下,当环境温度高于冰点时,进气部件表面也会发生结冰现象;明冰不仅会影响进气部件的气动特性,还存在冰层脱落的危险;结合BP神经网络可以形成一套具有适用范围的船用燃气轮机进口导流罩结冰临界温度预测代码。

The aerodynamic characteristics of the intake components of marine gas turbine would be changed by icing,which will affect working efficiency of the compressor.In this paper,two-dimensional icing of inlet guide vane and center deflector of marine gas turbine is calculated,and then the icing critical temperature of the center deflector of marine gas turbine is predicted based on the BP neural network.The results show that the icing parameters will influence the icing shape and icing species on the surface of component,and thereby influence the aerodynamic characteristics of the component.Under certain conditions,when the ambient temperature is higher than the freezing temperature,icing will also occur on the surface of intake components.Glaze ice will not only affect the aerodynamic characteristics of intake components,but also cause the risk of ice falling off.Combined with BP neural network,a set of applicable prediction codes for critical icing temperature of the center deflector of marine gas turbine can be formed.