Abstract: To study the effects of the high and low inlet on the ingestion，an experimental and unsteady numerical investigation was conducted to study the effects of high-low air inlet on the characteristics of rim seal，and the mixing flow of high and low air inlet was analyzed. The results show that different air inlet types had influence on the axial distribution of sealing effectiveness. The axial distribution of sealing effectiveness of high gas inlet was upward，but low gas inlet was the opposite. However，for two kinds of gas inlet，the sealing effectiveness was almost the same near the rim seal. High gas inlet can more effectively stop the diffusion process than low gas inlet，but two kinds of gas inlet do not change the diffusion process at the rim seal.

Key words: High-low gas inlet；Gas ingestion；Unsteady simulation； Sealing characteristics；Mixing flow

摘要： 为了分析高低位进气方式对燃气入侵现象的影响，采用实验和非稳态的数值模拟方法研究了高低位进气方式对盘腔封严特性的影响，对比分析得到高低位进气方式的掺混流动过程。研究结果表明，高低位进气方式对封严效率的轴向分布有影响，高位进气封严效率沿轴向分布呈上升趋势，低位进气反之；在轮缘封严附近，两种进气方式的封严效率几乎不变；高位进气较低位进气有效阻止了入侵燃气向盘腔内部扩散过程，但没有改变封严环附近的扩散过程。

关键词: 高低位进气；燃气入侵；非稳态模拟；封严特性；掺混流动