1. The results show that the unsteady characteristic is obvious, especially at laryngeal of the volute. 计算表明：部分流泵内流的非定常特性明显，蜗壳喉部尤为剧烈；
2. A particle image velocimetry system was used to measure the secondary flow in the volute cross-section and the blade wake flow. 用粒子图像速度场仪技术对叶片尾迹区及蜗壳出口横截面上的二次流做了详细的变工况测量与分析。
3. Start with increasing the clearance of impeller outer diameter &volute tongue and radius of curvature, the specific denoising measures on structural design of centrifugal fan are set forth. 从增加叶轮外径与蜗舌的间隙和增加蜗舌曲率半径入手，阐述了离心通风机在结构设计上降噪的具体措施。
英英解释
n.
1. ornament consisting of a curve on a plane that winds around a center with an increasing distance fro
2. a structure consisting of something wound in a continuous series of loops adj.
1. in the shape of a coil
