The diesel engine's noise is measured by using the acoustic pressure method. It separates successfully the engine's combustion noise, mechanical noise and inletnoise in test.
Vortexs are observed after the beams, which greatly influence the inlet air-flow of fan, reduces the air-flux, causes noise and wastes energy.
支承结构造成的流体绕流现象在风机进口处形成涡流，造成风机风量减少，噪声增加，浪费能源。
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A gasket (21) which had better be plastic extends from the chopping ring (20) to the inlet (16) and lowers the noise produced when the processor is used.