海洋盐雾环境下燃气轮机性能退化规律研究

Gas Turbine Performance Degradation in Marine Environment

舰船燃机的工作环境中含有大量盐雾颗粒,会对压气机部件造成盐雾腐蚀,导致压气机内部部件表面粗糙度增加,压气机性能衰退。以NASA Stage 35单级轴流压气机为研究对象,分析盐雾颗粒在压气机部件表面的分布情况,根据盐雾颗粒在不同位置的分布情况对压气机叶片表面的网格进行分区,给定叶片不同区域位置不同的粗糙度值,并进行数值模拟计算,计算结果显示,粗糙度对压气机性能衰退的影响主要体现在等熵效率上,对压气机压比的影响较小,叶片表面粗糙度的增加还会减小压气机的稳定工作裕度。

The working environment of the ship's gas turbine contains a large amount of salt spray particles.Compressors working in a salt spray environment for a long time will cause salt spray corrosion of the compressor components.Corrosion causes the surface roughness of the internal components of the compressor to increase,resulting in the compressor Performance decline.The article selects NASA Stage 35 single-stage axial compressor as the research object,analyzes the distribution of salt mist particles on the surface of its key components during compressor operation,and according to the distribution of salt mist particles at different positions of the components The grid is partitioned,the roughness values of different positions of the blade are given,and the numerical simulation of the compressor is calculated.The calculation results show that the effect of roughness on the performance degradation of the compressor is mainly reflected in the isentropic efficiency.The effect of the ratio is small;the increase of the surface roughness of the compressor blade will also reduce the stable working margin of the compressor.