Abstract
Numerical studies of a marine diesel engine intake silencer are conducted to evaluate its performance, and effects of the silencer on the turbocharger compressor performance are also discussed. The results show that the duct acoustic mode method can be used in the silencer transmission loss prediction, and the predicted noise reduction and main frequency range agree with the measurements fairly well. However, it is found that the silencer compromises the compressor performance by shortening its operating range. It is found that the static pressure on the compressor blade surface is decreased, thus the compressor total-to-total pressure ratio and isentropic efficiency are reduced. Pressure fluctuations at compressor rotor and stator inlets enhanced when a silencer is installed, which means the trend of pressure spectrum in the rotor and stator passage is changed. Compared with the results of a compressor in natural aspiration, it is found that the silencer can significantly reduce high-frequency noise. In particular, it is quite effective in tonal noise reduction. In addition, the compressor inlet noise spectrum indicates that noise radiation characteristics are different with a silencer installed.
Highlights
Turbochargers are widely used in marine low-speed diesel engines, and it can improve the in-cylinder combustion, increase the engine output power, and reduce the fuel consumption and exhaust emission.[1]
The dipole source is attached to the noise source surface, the acoustic outlet is defined as automatically matching layer (AML) boundary, the air material property is defined in noise calculation domain, and all solid walls are set as rigid wall
Numerical and experimental studies are conducted to investigate the performance of turbocharger intake silencer
Summary
Turbochargers are widely used in marine low-speed diesel engines, and it can improve the in-cylinder combustion, increase the engine output power, and reduce the fuel consumption and exhaust emission.[1]. The effects of the silencer structure on the compressor global performance, unsteady flow characteristics, and intake noise were numerically analyzed.
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