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AXIAL FLOW FAN WITH BLADES TWISTED ACCORDING TO A BLADE PITCH RATIO THAT DECREASES (QUASI) LINEARLY WITH THE RADIAL POSITION
AXIAL FLOW FAN WITH BLADES TWISTED ACCORDING TO A BLADE PITCH RATIO THAT DECREASES (QUASI) LINEARLY WITH THE RADIAL POSITION
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机译:叶片斜率与叶片螺距成比例的轴向流动风扇,叶片的径向倾角(准)减小
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摘要
An axial flow fan (1) is disclosed comprising a hub (3),an annular shroud (6) extending concentric with the axis (4) of the hub (3), and a plurality of fan blades (2) connected at a root end (11) to said hub (3) and having a free tip end (7) extending radially towards said shroud (6), wherein the blades (2) are designed so that the fan (1) when in operation at nominal operating conditions generates a fluid flow in the immediate vicinity after the blades (2) which comprises a core flow that substantially is a forced vortex flow where the tangential flow speed component (c2, u) is proportional with the radial distance (r) from the axis (4). Equations to define the chord angle θ of the blades (2) are provided.
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机译:公开了一种轴流风扇(1),其包括毂(3),与毂(3)的轴线(4)同心延伸的环形护罩(6)以及在根部连接的多个风扇叶片(2)。端(11)通向所述轮毂(3),并具有径向朝所述护罩(6)延伸的自由末端(7),其中叶片(2)设计成使得风扇(1)在正常工作条件下工作时在叶片(2)之后的紧邻区域中产生一个流体流,该流体流包含一个核心流,该核心流基本上是一个强制涡流,其中切向流速分量(c 2 Sub>, u Sub >)与距轴(4)的径向距离(r)成比例。提供定义叶片(2)的弦角θ的方程式。
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