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

转子中的流动对西洛克风扇性能的影响

基本信息

批准号：
09650211
负责人：
ADACHI Tsutomu
金额：
$ 1.34万
依托单位：
Osaka Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650211/
关键词：
Sirocco fan Flow angle and velocity Flow in the blade passage Measurement of flow velocity Performance of fan シロッコファン流れ計測

项目摘要

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.

在同一机匣中，采用9个不同叶片形状的转轮叶片，测试了叶片形状对西洛克通风机性能的影响。这9个不同的转轮叶片具有130 mm的内径、160 mm的外径和46 mm的宽度。从叶片入口处的速度三角形考虑，叶片入口角取10 °至15°。对于这些值的转轮叶片的效率是好的，但不能获得大流量。入口角必须在75 - 90°范围内。出口角宜为150〜160°。对于这些转轮叶片，虽然气流在前缘处分离并在后缘处重新附着，但气流沿着叶片表面流动。叶片宽度中心处的压力面流速较大，吸力面流速较小。偏角，即，叶片出口角与气流出口角之差，如果设计得当，取零值。叶片厚度越大，尾流宽度与桨距的比值越大。当叶片出口角大于160°时，出口气流循环。叶片进口处的气流突然转向会产生进口涡。叶片倾角对进口涡的大小有影响。倾斜比，即，叶片倾斜角θ与入口角β之比是重要的。压力和流量的最大值可在（θ/β ε D21 ε D2）=0.35时获得。考虑到上述情况，叶片设计的合适值为：（θ/β θ D21 θ D2）=75 ° × 90°，（θ/β θ D21 θ D2）=0.35，β θ D22 θ D2=150 ° × 160°。刀片厚度必须尽可能薄。