【摘要】 对稳流试验中螺旋进气道－气门－气缸内３维流场进行了数值模拟，分析了气道形状、气门偏置对流场特征和涡流比的影响。计算表明：螺旋气道斜坡段产生的气流角动量是气流在气缸内形成旋流的主要原因。气流在螺旋进气道内产生的角动量与气缸内进气射流碰撞气门盘、气门座和气缸壁产生的角动量相结合，在气缸内形成复杂的旋流运动，而气流运动到气缸出口平面时，小旋涡与主旋流融合，形成了单一方向的旋流，因而气道涡流比随着气缸轴向距离的增大而增大。这些结果表明，采用流动数值模拟可以获得稳流试验中难以得到的内部流动信息，从而为气道设计提供更有力的依据。更多还原

【Abstract】 The three dimensional flow field of helical intake port valve cylinder during the steady flow rig experiment was simulated.The influences of the shape of intake port and offset of valve on the characteristics of flow field and swirl ratio were analyzed.Angular momentum of airflow produced in the front of helical flow passage of inlet port is principal share of forming spin flow in cylinder.Angular momentum of airflow produced in helical inlet port is combined with which produced by collision against valve,valve seat and cylinder wall,which forms complicated rotation flow in cylinder.At the cylinder exit,small vortex and major spin flow mix together.Swirl ratio of the port incrceases with the increasement of the axial distance in cylinder.It was found that the method of flow modeling could get more information on flow field and provide strong basis for the design of inlet port.更多还原