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Radial Pump Impeller Design (Example)

Radial Pump Impeller Design (Example). Design a rotor(impeller) of a radial water pump for the following given values Q = 300 m 3 /h (0.0833 m 3 /s) H = 50 m n = 1450 rpm. The Specific speed for the pump is calculated from the following formula for the given values

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Radial Pump Impeller Design (Example)

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  1. Radial Pump Impeller Design (Example)

  2. Design a rotor(impeller) of a radial water pump for the following given values Q = 300 m3/h (0.0833 m3/s) H = 50 m n = 1450 rpm

  3. The Specific speed for the pump is calculated from the following formula for the given values • After finding the specific speed the shape of the impeller can be decided using the following table. • The specific speed is in the radial type pump range

  4. The shaft Power is given as: • The overall efficiency, ηo, for a single stage, single entry, radial pump can be read from the figure below to be ηo = 0.85. • The pump power becomes,

  5. (Source: Centrifugal Pumps, Johann Friedrich Gülich, 2nded)

  6. Shaft diameter can be found using the following formula • The torque can be calculated as it follows: • The allowable shear stress for most of the shafts is in the range between 40 -60 N/mm2.Thus the shaft diameter becomes: • The hub diameter, dh = 1.1 to 1.3 ds

  7. The eye diameter (D1) can be calculated by assuming inlet number . The radial velocity at the inlet is given by: • The volume flow rate at the suction end is given by: • Calculating for the eye diameter, • The volumetric efficiency is given by:

  8. The inlet number can be found from the following table. Guidelines to choose ε

  9. From the table, • Thus, • Another option to estimate the value of inlet number is to use the formula by Pfleiderer, • Thus, D1 becomes,

  10. The outer diameter D2can be calculated using: • The head coefficient (ψ) The head coefficient for different type of pumps is given below.

  11. Choosing ψ = 1, • The specific diameter (δ) The specific diameter becomes,

  12. D2 becomes, • The specific diameter is plotted in the following diagram for various specific speeds, • From the table, δ = 6.5. • Thus the outer diameter can be taken to be D2 = 0.4m

  13. Cordier Diagram

  14. Blade width b1 • The Blade width at the outlet b2 • C2m can be found from figure below.

  15. Blade angle β0 • Blade angle β2can be estimated from the previous figure. • Number of blades

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