中文摘要：

针对廊道型气垫式调压室的罩式闭气结构比较复杂而且施工难度较大的特点,提出采用水平圆钢管型洞室代替常用的长廊道型洞室的新型气垫式调压室方案。以四川某水电站气垫式调压室为例,经大波动过渡过程计算和小波动稳定性分析,比较2种不同体型气垫式调压室的水力性能和运行稳定性。结果表明：在洞室横断面面积相等的情况下,圆管型气垫式调压室的小波动稳定性较好;调压室内水位波动幅值较小、最大气体压力和机组蜗壳进口最大压力较小,其大波动水力性能也相对较好。

英文摘要：

Considering the complexity and construction difficulty of the anti-leakage structure of a corridor-shaped air-cushioned surge tank,a new type of air-cushioned surge tank,here called the round pipe-shaped surge tank,is introduced as an alternative in this paper.Taking an air-cushioned surge tank at a hydropower station in Sichuan Province as an example,the differences in the hydraulic performance and operating stability between the two design schemes based on the transient process simulation and stability analysis were explored.The results show that as the cross-sectional area of the tanks was the same,the round pipe-shaped surge tank had better stability with small fluctuation.Meanwhile,the amplitude value of the water level in the tank was smaller,the maximum gas pressure and maximum water pressure in the spiral case inlet were relatively smaller,and,thus,the round pipe-shaped surge tank had a relatively better hydraulic performance.