摘要
DDZ 型墙装式轴流风机具有两面角几何扭曲叶片,可以明显改善风机的进口流动条件,使风机具有流量大、压力低、效率高、噪声小和气流分布均匀等特点。计算分析了这种风机进口附近的流动情况,建立了风机进口处的空气动力学模型。根据此模型计算了附着涡切向环量在子午面内的诱导速度。结果表明,诱导速度使叶轮进口处,尤其是叶轮外缘处的流动条件明显改善。这从理论上阐明了这种风机性能优良的根本原因。
The performance of DDZ type ventilating fan fixed in the wall is investigated.An aerodynamic model of ventilating fan with peculiar twist blade is developed.The induced ve- locity of tangent circulation of vortex line in perpendicular plane is calculated based on the model.The enter flowing is obviously improved by induced velocity.
关键词
进气道
风机
轴流式
流场
DDZ type ventilating fan fixed in the wall
blade with peculiar twist angle
enter flowing field
tangent circulation of vortex line
induced velocity
