Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (3): 129-132.doi: 10.3969/j.issn.1000-565X.2010.03.023

• Mechanical Engineering • Previous Articles     Next Articles

CFD Investigation into Pressure Loss of Single-Cylinder Engine Muffler

Zhang De-man  Li Shun-ming  Men Xiu-hua   

  1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China
  • Received:2009-04-20 Revised:2009-07-09 Online:2010-03-25 Published:2010-03-25
  • Contact: 张德满（1983-），男，博士生，主要从事发动机排放控制及噪声控制研究． E-mail:linl985101@sina．com
  • About author:张德满（1983-），男，博士生，主要从事发动机排放控制及噪声控制研究．
  • Supported by:

    国家自然科学基金资助项目（50675099）;江苏省自然科学基金资助项目（BK2007197）;江苏省普通高校研究生科研创新计划资助项目（CX08B-044Z）

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Abstract:

In this paper, first, the pulse pressure signal at the entrance of a single-cylinder engine muffler was measured. Next, based on the physical structure of the muffler, a simulation model of the muffler was constructed. Then, by considering the exhaust characteristics of the single-cylinder engine, a method was proposed to determine the critical conditions according to the effective pulse pressure. Moreover, the distribution of pressure loss in the muffler was simulated based on the computational fluid dynamics （CFD） , and the simulated results were used to discover the parts with large pressure loss in the muffler, with some measures being taken to improve the internal structure of the muffler. Finally, in the same operation conditions, the entrance pressure signal of the improved muffler was measured and simulated. The results indicate that the pressure loss in the improved muffler falls remarkably and distributes more regularly.

Key words: single-cylinder engine, computational fluid dynamics, muffler, pressure loss