Study On Flow Field Simulation And Experimental Test Of Inlet Filter For Heavy Gas Turbine

There are a large amount of air as the working medium to generate electricity in gas turbine,and there are pollutants such as solid dust and liquid droplets in the air introduced from the atmospheric environment during the working process,which will cause wear and corrosion to the combustion system and turbine blades of the gas turbine,etc.Therefore,it is necessary to remove the pollutants in the air through the air inlet filter,so that air with a high degree of cleanliness can enter the gas turbine to ensure the long-term safe and reliable operation of the combustion engine unit,the installation of the filter will generate pressure loss,which will lead to the reduction of the efficiency of the combustion engine,therefore,the optimization of the filter research has important theoretical value and practical significance.In this dissertation,the filter model is simplified based on the porous media model,and the three-dimensional simulation model of the filter is established.The model is verified by the experimental test results.The influence of the filter structural parameters and operating conditions on the filter pressure loss and air distribution uniformity is studied.Finally,the filter is optimized.The main conclusions of this dissertation are as follows:(1)The air volume.the number of V-shaped structures n and the height of the V-shaped structures h affected the resistance performance of the filter.The filter pressure loss increased with the increase of air volume,in a quadratic polynomial relationship.The filter pressure loss decreased first and then increased with the increase of n,and there was an optimal number of V-shaped structures.The filter pressure loss decreased gradually with the increase of h,and the decreasing rate became slower and slower.(2)The degree of flow field inhomogeneity varies with n and h.The larger the n and h,the more inhomogeneous the flow field.The larger the air volume,the more inhomogeneous the flow field.The height of the V-shaped structure has little effect on the flow field distribution.Meanwhile,The results shown that the velocity distribution in the V-shaped structure are more inhomogeneous when n and h increased.(3)In order to consider the filter pressure loss and flow field distribution comprehensively,a parameter W was defined to evaluate the filter performance.It was found that the smaller the n and h,the better the filter performance,but h had little effect on performance.In order to keep the filter area unchanged and maintain the optimal performance of the filter,n was kept constant by changing the size of h to adjust the filter area.Finally,the filter structure with unchanged filter area and optimal performance was obtained:n=3,h=542mm.