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本文对汽油机缸内滚流强度的预测模型进行了讨论。根据对滚流进气系统的稳流试验和拖动工况下缸内流场的ＬＤＡ测量结果，提出如下观点：在进气过程的早期，由于活塞位置太靠上，其顶面与燃烧室其它壁面所形成的空间形状不适应滚流的运动路线而不能有效地生成滚流——尽管在稳流试验台上可测到相应的滚流转速或角动量流率。活塞的这一临界位置与压缩过程后期滚流开始畸变、破碎时的活塞位置相当。据此作者建立了缸内滚流比预测模型，并在稳流试验和拖动工况下缸内流动的ＬＤＡ测量的试验中得到验证。
In this paper, the prediction model of cylinder tumble strength in gasoline engine is discussed. According to the steady flow test of the tundish inlet system and the LDA measurement results of the flow field under the dragging condition, the following opinion is put forward: In the early stage of the intake process, because the piston position is too close to the upper surface of the combustion chamber The shape of the space created by the other walls is not adapted to the tumble flow path and does not effectively produce tumble flow - although the corresponding tumble flow rate or angular momentum flow rate can be measured on a steady flow test rig. This critical position of the piston begins to distort from the tumble at the later stage of the compression process, and the position of the piston at the time of crushing is comparable. Based on this, the author established a prediction model of the in-cylinder tumble ratio and verified it in the experiments of steady flow test and LDA measurement of the in-cylinder flow under the dragging condition.