Numerical simulation of flow inside voluteand leakage loss show that the flow field with the rings are more uniform and theleakage loss are reduced compared with that without rings.

• 对风机蜗壳内部流动特征和间隙泄漏情况的研究表明,加装防涡圈后的风机蜗壳内部流场得以改善,泄漏损失大大减少。