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利用数值方法研究了轴向封严结构内的燃气入侵与封严流动.研究表明:由于封严间隙处流场参数梯度较大,封严面非匹配网格影响了数值传递从而造成封严效率数值结果偏高.定常数值模拟结果低估了导叶下游静压的周向不均匀性,同时没有考虑转静干涉,所得到的封严效率较非定常结果要高.非定常计算得到的导叶下游静压周向分布与试验结果符合较好,在盘腔子午面内形成3个涡核结构,引导静盘壁面流体流向动盘以补充动盘泵效应所需流量.封严间隙内存在旋转的燃气入侵与出流结构,燃气入侵伴随较大的切向速度,封严间隙内的封严间隙涡对封严效率有积极影响,封严面上径向速度的瞬时值为时均值的3倍以上.燃气入侵受到导叶尾缘周向静压分布和转子旋转的共同影响.
The gas invasion and seal flow in the axial seal structure are studied numerically.The results show that the sealing efficiency is affected by the large gradient of the flow field parameters in the seal gap and the unqualified grid of the seal surface, The numerical results are high.The results of constant numerical simulation underestimate the circumferential inhomogeneity of the static pressure downstream of the guide vane without considering the static interference and the obtained sealing efficiency is higher than the unsteady results.The unsteady calculated guide vane The circumferential distribution of the downstream static pressure is in good agreement with the experimental results, and three vortex core structures are formed in the meridional plane of the disk to guide the flow of the fluid on the stationary disk wall to the moving disk to supplement the flow required by the dynamic disk pump effect. Gas intrusion and outflow structure. Gas intrusion is accompanied by a large tangential velocity, and the seal gap vortex in the seal gap has a positive effect on the seal efficiency. The instantaneous value of the radial velocity on the seal surface is 3 Times above.The gas invasion is affected by the circumferential static pressure distribution at the trailing edge of the guide vane and the rotation of the rotor.