The calculating method of axial flow pump shaft

appearance structure and operation principle of axial flow pump manufacturer with centrifugal pump is not the same, its function also has a great difference. In practical operation, to severe and choose the use of different ways to counseling produce practice, fruit processing question. Parameters to indicate the function of axial flow water pump with homework. Parameters such as flow rate, head, power, power relationship are bound to each other, if the parameter associated with the curve to show that is water pump function curve, the curve's test method for water pump factory, supply technical information to users. Between the flow and head, flow and power of changing the rules are the same.

1。 Hydraulic model of planning to

( 1) Change of circulation, lift shaft surface speed lift planning foundation method is the result of cascade theory, for the blade axial flow planning, made the following assumptions:

1) Fluid through the blades, each cylinder flow layer between each other is not disturbed.

2) When accounting lift, blade assumed to be infinite wingspan, can use binary airfoil experiment and theory calculation, then the revision of the array cascade.

3) Axial flow pump's hydraulic power or hydraulic loss to power after the existing hydraulic model, able to budget.

( 2 axial flow pump circulation radial spreading rules become circulation planning method of primary focus is according to the condition of impeller mechanical activity, make the circulation distribution along the radial blade has changed, namely the root and leaf tip ( The outer peripheral) Small and middle load is bigger. So choose variable circulation plan, is used to dive in the axial flow water pump flow state in practice a useful technique. And this technique with the good or bad, the key is on the basis of detailed planning requirements, reasonable selection of circulation distribution rules.

in planning practice, contact with the theoretical analysis and model experiment, introduce the accounting regression of the accounting formula:

Γ ( r) = Κ r Γ 0

type Γ ( r) — — Circulation distribution function, r for impeller radius; Γ0 - — Spread evenly circulation; Κr— — Radial circulation spread coefficient, Κ r = - 2. 83 r2i + 4。 64ri- 0. 8, ri is the radius of the cylinder.

( 3) Axial flow pump shaft surface speed of spread rule in planning practice, contact with the theoretical analysis and model experiment, the axial circulation Κ spreading coefficient m introduce use calculation formula:

Κ m = - 1. 807r2i+3. 037ri- 0. 215

the domestic development of excellent hydraulic model, the integrated hydraulic performance can be comparable to similar foreign products, even more than the axial flow water pump products abroad.

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