1 / 16

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

long
Download Presentation

Radial Pump Impeller Design (Example)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related