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Research on Measurement Method of Aerodynamic Noise of Muffler

Wuhan University of Technology-Liping Xie, Zhien Liu, Zhu Yawei, Kai Liu, Chenhui Ye
  • Technical Paper
  • 2020-01-0423
To be published on 2020-04-14 by SAE International in United States
With the development of high-speed internal combustion engines, aerodynamic noise has become a major factor in reducing the performance of muffler. Based on the two-microphone transfer function method and static transmission loss of mufflers, this paper proposes a measuring method to detect the aerodynamic noise of the muffler. On the built-in muffler aerodynamic noise test bench, a special sampling tube was designed to measure the aerodynamic noise of the muffler at different flow velocity. For the sound absorption end with large reflection coefficient, the test and simulation data have a large error at low frequency. To cope with this problem, a correction formula is derived to eliminate the reflection of sound waves at the end of the test pipeline and form multiple reflections in the upstream and downstream. The test results of the muffler on the test bench show: The aerodynamic noise data obtained by the sampling pipe is basically consistent with the simulation results by means of leading out measurement, which realizes the measurement of high noise in the pipe by an ordinary sensor.…
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Thermo-Mechanical Fatigue Study of Gasoline Engine Exhaust Manifold Based on Weak Coupling of CFD and FE

Sheng-hao Xiao
Wuhan University of Technology-Zhien Liu, Jiangmi Chen
Published 2016-10-17 by SAE International in United States
This paper combines fluid software STAR-CCM+ and finite element software ABAQUS to solve the temperature field of this Gasoline engine exhaust manifold based on loose coupling method. Through the simulation of car parking cooling - full load condition at full speed, we estimate thermal fatigue life of the exhaust manifold with the plastic strain increment as the evaluation parameters. It can guide the direction of optimal design of the exhaust manifold. Here we also revealed how the bolt force affects the manifold elastic and plastic behavior.
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3-D Numerical Simulation of Transient Heat Transfer among Multi-Component Coupling System in Internal Combustion Chamber

Huazhong University of Science & Technology-Yankun Jiang, Zheling Dong, Bin Pi
Jingchu University of Technology-Yajun Liu
Published 2008-06-23 by SAE International in United States
A 3-D numerical analysis model of transient heat transfer among the multi-component coupling system in combustion chamber of internal combustion engine has been developed successfully in the paper. The model includes almost all solid components in combustion chamber, such as piston assembly, cylinder liner, cylinder head gasket, cylinder head, intake valves and exhaust valves, etc. With two different coupling heat transfer modes, one is the lubricant film heat conduction between two moving components, another is the contact heat conduction between two immovable solid components, and with the direct coupled-field analysis method of FEM, the heat transfer relation among the components is established. The simulation result dedicates the transient heat transfer process among the components such as moving piston assembly and cylinder liner, moving valves and cylinder head. The effect of cylinder head gasket on heat transfer among the components is also studied. The model and the software will be important analysis tools to study the whole engine heat transfer, heat balance and heat loads in internal combustion engine.
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