Therefore a new design method with varying spiral angles of volute was proposed by means of focus on improving the uniformity of pressure field near the tongue of the volute.
因此，提出了一种通过改善蜗舌附近压力区的均匀性的、新的变螺旋角蜗壳设计方法。
2
In addition, the Twilight Zone theme is carried on to the tongue where the same spiral pattern is placed as well as on the insole.