径向圆柱型气体螺旋槽密封的理论与实验研究

 采用坐标变换的方法对圆柱型气体螺旋槽密封的控制方程进行理论计算.对复杂形状求解域构筑了非矩形网格,再通过坐标变换形成规则的矩形网格.这种数值计算方法可在改变结构参数时,避免重新划分网格.分析了影响密封性能的主要设计参数如螺旋角α,槽数n等对密封压力的影响规律,得出了优化结果.设计了实验台,进行了大量实验验证.实验值与理论计算值吻合较好.最后,给出了该种密封型式的主要设计参数选取范围.

Study on Seal of Gas Along Cylindrical Spiral Groove

The governing equation of gas cylindrical spiral groove is solved theoretically by the coordinate transformation from non rectangle grid in computational area with complex shape to rectangle grid. The purpose of the transformation is to avoid re forming grid while the structural parameters being changed. The design parameters that affect the seal performance are proposed. The relationship of these major parameters such as groove numbers and spiral angle to seal pressure is revealed and the optimized result is obtained. Mass experiments are conducted in designed test rig. Experimental results have a good agreement with the calculated ones. In the end, the selecting domain of structural parameters to design gas cylindrical spiral groove seal is concluded for engineering application.