Effect of Flow in the Rotor on the Performance of a Sirocco Fan

叶片形状对一个Sirocco风扇性能的影响已经在相同的情况下使用了9个运行的叶片，不同的叶片形状。这9个不同的运行叶片具有130毫米的内直径、160毫米的外直径和46毫米的宽直径。考虑到刀片进口处的速度三角形，刀片进口角度将达到10 - 15度。因为那些价值观的跑步者的血的效率是好的，但大的电荷可能不会出现。入口处必须在75 - 90度的范围内移动。出口角度是150 - 160度的。因为这些跑步者的刀片沿着刀片表面流动，所以它一次在领先的边缘和重新附着在拖车边缘。在center of the blade width的center of the blade width上的流量流量要求较大的值。Deviation angle，I. E刀片出口角度和流动出口角度的差异，需要零值，如果正确的设计是可以做到的。如果刀片音高的唤醒宽度与较大的比率，那么刀片厚度就较大。如果刀片出口角度大于160度，则出口流动循环。入口涡流是因为突然的流量在刀片式入口处旋转的。“入口漩涡的范围被刀片的形成角度所影响。”增加比率，即，the ratio of blade inclination angle（the ratio of blade inclination angle）和the inlet angle（the inlet angle）。The maximum values of pressure and discharge can be obtained at （\/\D21\D2） = 0. 35。Considering the above affairs， the values βイD21エD2）=75 ~ 90°， （β/βイD21エD2） =0.35 and βイD22エD2=150 ~ 160°are suitable for the blade design.“刀锋的厚度必须是可能的，”

Effects of blade shape on the performance of a Sirocco fan was measured using 9 runner blades with different blade shape in the same casing. These 9 different runner blades have inner diameter of 130 mm, outer diameter of 160 mm, and 46 mm in width. Considering from the velocity triangles at the blade inlet, the blade inlet angles are to be taken 10〜15°. For the runner blades with these values the efficiency was good, but large discharge couldn't be obtained. Inlet angle must be taken in the range of 75〜90°. The outlet angle is desired to be 150〜160°. For these runner blades flow flows along the blade surface, though it once separates at the leading edge and reattaches at the trailing edge. The flow velocity takes large value at the pressure surface and smaller values at the suction surface at the center of the blade width. Deviation angle, i.e., the difference of blade outlet angle and flow outlet angle, takes zero value, if proper design is conducted. The ratio of wake width to the blade pitch becomes larger, if the blade thickness is larger. If the blade outlet angle is larger than 160°, the outlet flow circulate. Inlet vortex arise because of the sudden flow turning at the blade inlet. The extent of inlet vortex is influenced by the inclination angle of blade. The inclination ratio,i.e., the ratio of blade inclination angle θand the inlet angle βィイD21ィエD2 is important. The maximum values of pressure and discharge can be obtained at (θ/βィイD21ィエD2) =0.35. Considering the above affairs, the values βィイD21ィエD2)=75〜90°, (θ/βィイD21ィエD2) =0.35 and βィイD22ィエD2=150〜160°are suitable for the blade design. The blade thickness must be thinner as possible.