Study On Gas Intake System's Aerodynamic-Acoustic Performance And Analysis Of Complex Sound Field

In this paper,some investigation on the intake system and the complex sound field have been done respectively. The paper focuses on analyzing the intake system's acoustic properties and effects of aerodynamic performance by Engineering calculation,CFD and Acoustic-FEM, and further, using sound-vortex theory to analyze renewable noise in the intake system. Besides, based on measurements and calculation of Acoustic reverberation field, the ways to analyze space distribution of sound distinguish noise sources in the paper are been studied, furthermore, the program which is use to predict space distribution of sound is made.Main contents and conclusions of the research are described in the followings,1. This study has established numerical simulation program of intake system of ship's gas turbine's and muffler's flow field and simulated aerodynamic performance of intake system and muffler. According to the results of this study, intake system's and muffler's structure can be optimized in the future.2. In this study, three-dimensional model of muffler and intake system hve been established by UG, the model grids are created by commercial software ICEM 11.0,Then, using FLUENT to study intake system's and muffler'aerodynamic characteristics.3. This research established three-dimensional numerical simulation model by ANSYS11.0, using acoustic finite element analysis software SYSNOISE5.5 to study the intake system's and muffler's acoustic performance.4. After the intake system and muffler CFD analysis of flow field has been finished, the relationship between the vorticity distributions and aerodynamic noise source distribution is researched by sound-vortex theory in the intake system.5. In according to the noise measurement inside the power plant of 350MW gas-steam combined cycled generator, the main sources have been analyzed. Based on these measurements, the sound power levels of various sound sources and the space distribution of sound pressure level which have been calculated in the paper tallied with the results of measure very well. That, Lp Value Prediction Method, has been verified is suitable for prediction of plant's internal sound field distribution.In the paper, that, experimentation and numerical simulation have been used to investiage the intake system's acoustic properties and effects of aerodynamic performance and distinguish noise rources, have very important academic significance and values of engineering Applications.