多齿轮缘封严特性的实验

使用气体体积分数法得到了多齿轮缘封严的封严效率分布，获得封严效率随无量纲封严流量变化规律，最终拟合得出实验工况下的最小封严流量计算关联式（实验中主流雷诺数为1.42×105~3.20×105,旋转雷诺数为5.27×105~1.36×106）.通过对二氧化碳体积分数的测量结果表明:在盘腔内部高半径处封严效率较低，而低半径处封严效率一直处于较高的水平；封严效率随封严流量的变化与Owen封严效率方程有较好符合度，说明可以用封严效率方程对多齿轮缘封严进行预测，实验结果进一步扩展了其应用范围. 

Experiment on multi tooth rim sealing.

The gas volume fraction method was used to achieve the distribution of the sealing effectiveness of multi tooth rim sealing, and the sealing effectiveness varied with the non dimensional sealing flow rate，and finally the correlation of the minimum sealing flow rate was obtained（mainstream Reynold number from 1.42×105 to 3.20×105, rotating Reynold number from 5.27×105 to 1.36×106）. The measurement results of carbon dioxide volume fraction showed that the sealing effectiveness was low at high radius but high at low radius. The changes in the sealing effectiveness with the sealing flow rate agreed well with Owens sealing effectiveness equations, so the sealing characteristic could be predicted, and the experimental results expanded its application scope.