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在早期研究的结果上,提出了一种齿间浅槽结构的直通齿衬套,即在与篦齿齿腔正对的衬套上加工制成浅槽.这种齿间浅槽破坏了壁面射流附面层的轴向连续性,导致射流流经浅槽后向篦齿齿腔发生小角度偏转,这样能有效地降低直通篦齿的透气效应,进而降低泄漏量.实验结果表明,相比于传统的光滑衬套,浅槽泄漏系数显著降低,其中矩形浅槽下降15%,平行四边形浅槽下降30%,封严性能大大提高,这进一步说明迎来流方向,较小的迎风角有利于射流偏转,而当射流离开浅槽时,较大的开槽角度增加了射流的流动阻力,更利于射流的偏转.
As a result of earlier studies, a through-the-tooth bushing with a shallow interdental groove structure was proposed, which was machined to be a shallow groove on a bushing facing the grate teeth cavity, and this shallow groove broke the wall The axial continuity of the jet laminar layer causes the jet to flow through the shallow groove and then deflects to a small angle to the cavity of the grate teeth so as to effectively reduce the air permeation effect of the straight labyrinth and further reduce the amount of leakage.The experimental results show that, In the traditional smooth bushing, the leakage coefficient of the shallow groove is significantly reduced, of which the rectangular shallow groove drops 15% and the parallelogram shallow groove drops 30%, the sealing performance is greatly improved, which further shows that the flow direction is facing, and the smaller windward angle Which is conducive to the jet deflection, and when the jet leaves the shallow groove, a larger slot angle increases the jet flow resistance, more conducive to the jet deflection.