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Zong J.-J.,Tongji University | Ni J.-M.,Tongji University | Qiu X.-J.,Shanghai Union Automobile and Tractor Industry Trade Co. | Li Y.-P.,Shanghai Union Automobile and Tractor Industry Trade Co. | Zhang H.-C.,Tongji University
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2010

Blow-by flow and oil content in it were experimentally studied for the crankcase ventilation system of an in-line four cylinder gasoline engine. On this basis, the flow characteristics of labyrinth air/oil separator integrated in the cylinder head cover were studied by using CFD software Fluent. The study focused on velocity field, pressure field and separation efficiency in the separation process under the operating conditions of the largest blow-by flow (15 L/min) and the max. torque (160N·m). The result shows that by means of the combined structure of porous plate and baffle plates, separation efficiency of the oil/air separator can reach more than 75% under the operating condition of the largest blow-by flow. When separation efficiency reaches 50%, particle diameter separated is less than 1.0μm, ensuring its reliable separation capability for oil particles of variable diameters. Source

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