Axial flow profile

On the foot blade axial poach one, its blade unit into a series of wing pharynx, Wei round wheels constitute a circular blade. Mountain to flow through the impeller fluid close trace theory now: located in turn with the axis of a cylinder, after vanes despun think out along the axial flow, so this kind of pump is called the axial flow pump, also known as Ling might water pump. Axial flow pump flow is relatively large, can reach 60 ^ / 8; '. Low level head, usually 1, therefore, high specific speed axial flow pump, the commonly used range between 500 ~ 1600. The advantages of axial flow pump are: (1) simple structure, under the condition of given parameters, the cross-sectional area ( Perpendicular to the plane of the rotating shaft > and weight than other types of vane pump is small; (2) whether in stop condition or running state, can be easily by changing the blade Angle was laid and change the flow quantity; (3) axial flow pump is usually a vertical structure, so the cover an area of an area small, also can be installed outdoor. The disadvantage of axial flow pump are: (1) self-priming ability is limited; (2) single stage head low; (3) efficiency curve steeper and high efficient area relatively narrow, if there is no impeller blade settling Angle adjusting device, poor economic when deviating from the design operation. Axial flow pump is widely used in irrigation, water supply and drainage, inland waterway dredging, power engineering and other liquid head need to transport a large number of request is not high, also has in the field of nuclear engineering, ship propulsion applications. Unlike brand pump centrifugal pump design theory, now a variety of axial flow pump design theory, have their own characteristics. In this chapter are usually adopted in design of axial flow pump lift method based on a single airfoil, the circular arc method based on the theory of the cascade without thickness and developed on the basis of theory of one yuan streamline method introduced. 5. 2 flow components structure parameters and axial flow pump design theory are almost all of the single stage. Mostly vertical installation with small area reduction, moreover also has the form of horizontal and inclined shaft installation, to flow, particularly large head is very low. Whatever the installation form of axial flow pump flow components of basic it is by the population, the leaf wheel, guide vane and guide vane of bend etc

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