GAS-LIQUID SEPARATOR

To provide a gas-liquid separator capable of collecting a liquid at a downstream position from a swirling flow generating member regardless of the flow rate of a gas-liquid two-phase fluid.SOLUTION: In a gas-liquid separator 16 having a pipe member 21 in which a gas-liquid two-phase fluid flows and a swirling flow generating member 22 disposed at the inside of the pipe member 21 and swirling the gas-liquid two-phase fluid by the swirling flow generating member 22 to separate a gas and a liquid from each other, the swirling flow generating member 22 spirally extends around a center axis O1 of the pipe member 21 and has a vane part 32 where a tip part 32a in a pipe diameter direction is continued over the whole periphery of the pipe member 21 when the pipe member 21 is viewed from an axial direction; and a communication part 34 communicating between a first space X upstream of the swirling flow generating member 22 and a second space Y downstream of the swirling flow generating member 22 by forming a swollen part 25d extending in an axial direction in an inner peripheral surface 25a of the pipe member 21 between the pipe member 21 and the swirling flow generating member 22.SELECTED DRAWING: Figure 2 【課題】気液二相流体の流速に拘らず、旋回流発生部材よりも下流の位置で液体を捕集することができる気液分離装置を提供すること。【解決手段】気液二相流体が流れる管部材２１と、管部材２１の内部に配置された旋回流発生部材２２と、を備え、旋回流発生部材２２によって気液二相流体を旋回させて気体と液体とを分離する気液分離装置１６において、旋回流発生部材２２は、管部材２１の中心軸Ｏ１を中心にして螺旋状延び、管部材２１を軸方向から見たときに、管径方向の先端３２ａが管部材２１の全周にわたって連続する翼部３２を有している。そして、管部材２１と旋回流発生手段２２との間には、管部材２１の内周面２５ａに軸方向に延びる膨出部２５ｄを形成することで、旋回流発生部材２２よりも上流の第１空間Ｘと、旋回流発生部材２２よりも下流の第２空間Ｙとを連通する連通部３４が設けられる。【選択図】図２