GAS-LIQUID SEPARATOR

A gas-liquid separator is capable of collecting liquid at a position downstream of a swirling flow generator regardless of a flow rate of the gas-liquid two-phase fluid. A gas-liquid separator (16) comprises a pipe member (21) through which a gas-liquid two-phase fluid flows, the gas-liquid two-phase fluid comprising gas and liquid, and a swirling flow generator (22) within the pipe member (21), the swirling flow generator being configured to swirl the gas-liquid two-phase fluid to separate the gas and the liquid therefrom. The swirling flow generator (22) comprises blades (32) that extend spirally about a central axis (O) of the pipe member (21). Each of the blades (32) comprises a distal end (32a) in a pipe radial direction of the pipe member (21). The distal ends (32a) are continuous over an entire circumference of the pipe member (21) when the pipe member (21) is viewed from an axial direction thereof. A communication portion (34) is provided between the pipe member (21) and the swirling flow generator (22). The communication portion (34) is configured to communicate a first space (X) upstream of the swirling flow generator (22) with a second space (Y) downstream of the swirling flow generator (22).