在稳流气道试验台上研究了 376四气门汽油机一进气门开、另一进气门全闭条件下的斜轴涡流特性 ,发现斜轴涡流倾角在进气过程初期很快跃升到近 90°,之后渐渐回落 ;在进气过程中期之后 ,其倾角稳定于 4 1°左右。这为解决四气门汽油机低转速时燃烧恶化问题提供了重要的理论依据 In the steady-flow airway test rig, the eddy-axis vortex characteristics of 376-valve four-valve gasoline engine with one intake valve open and the other intake valve fully closed were investigated. It was found that the inclination angle of the inclined axis jumped rapidly to nearly 90 °, and then gradually receded. After the middle of the intake process, its dip angle stabilized at around 41 °. This provides an important theoretical basis for solving the problem of deteriorating combustion when a four-valve gasoline engine is running at a low speed