Study On Air Filtering And Intake Silencer Performance Of Gas Turbine

The induction noise is a major noise source of gas turbine. The research objectives are the aerodynamic performance and acoustic properties of the air intake system of the gas turbine. First the main structure of the intake system was introduced; second the filtration and purification methods of the intake system were studied; then mechanisms and methods of how to resist the intake system noise were analyzed; at last the research about how to control the noise of the gas turbine intake systems was discussed. Based on the characteristics of the noise sources of the gas turbine intake system, we design the intake air filter and intake silencer by using the Computational Fluid Dynamics (CFD) method and the Acoustical Finite Element Method (Acoustical FEM). Main contents and conclusions of the study are described as follows:Numerical simulation models of the intake filter and intake silencers were built by the Gambit software. The aerodynamic performance of the intake purification muffler was simulated with the help of the Fluent, which is the commercial CFD software. Moreover, after analyzing the simulation results, we obtained the distribution of the flow field resistance.Furthermore, various parameters of the muffler structure, such as the thickness of the filter,inlet velocity, the absorber, the width of the inlet, and the separator baffle body shape of the intake purification silencer, were studied as well. Since all these parameters can affect the aerodynamic performance, they can be exploited to optimize the structure of the intake system.The finite element model of the intake silencer and filter were built by the finite element software ANSYS. Then the model was meshed and imported into the Virtual Lab Acoustics,which is the acoustical finite element software. Also, the filter acoustical parameters measured by the experiments were used as the filter material properties. The transmission loss of the intake silencer was obtained with the help of the acoustical simulation calculation. Different parameters of the filter structure, such as the percentage of perforation and the packing density of the sound-absorbing materials, were studied in order to improve the design of the air intake silencer. Moreover,the internal structure and the composition of the filter and silencer can have an effect on the performance of the intake system as well.