Aerodynamic And Acoustic Performance Research Of Engine Intake Muffler

With the development of design technology on naval vessel and ship craft, requirements about compaction and low noise of thermal power plant become more and more strict, as well as the main way to control and reduce noise of engine intake system is installed muffler at present, but design and research of engine intake muffler in our country is not so developed compared to developed countries, especially in flow field analysis and theory research about dynamic performance of muffler. Moreover, acoustical performance of muffler has been studied separately by traditional low noise research on engine intake system and it is difficult to find a good design of muffler with good performance. So finding a way of optimum design to do the low noise research of engine intake system including muffler is an import ways to improve the design efficiency of muffler, shorten the development cycle of muffler and optimize the low noise design of engine system.Two parts of research work are included in present study mainly: aerodynamic and acoustic performance prediction of muffler and optimum design way to do the low noise research of engine intake system including muffler. The main achievements include as bellowed,1. Simulation models of aerodynamic and acoustic performance for intake muffler have been set up and acoustical performance of muffler has been analyzed at both static and steady flow conditions, as well as aerodynamic performance has also been analyzed;2. Aerodynamic & acoustic experiment test rig of muffler and four different kinds of mufflers - expansion chamber muffler, micro-perforated pipe muffler, interpolation perforated muffler and dissipative muffler have been set up and designed, as well as both simulations and experiments for these mufflers and influencing factors of their performance have been carried out;3. Aerodynamic & acoustic experiment test rig of pipe system has been set up as well as both simulations and experiments have been carried out at pipe system with dissipative muffler conditions to investigate its aerodynamic and acoustic performance.4. Regenerated noise analysis has been carried out to complex pipe system based on Powell vortex theory and it is the theory support on optimum design and distribution of complex pipe system at low noise condition.