Question about Pump Inducer Nomenclature

[RezaFarrokhi]

Hi Everyone
I have a question about inducers. inducer is small axial flow pump that placed in front of suction side of centrifugal pumps for increasing the head and avoiding cavitation phenomena in centrifugal pumps.most of inducers have helical blades.my question consist of several parts that are as follows:
1-How are the angles and dimension defined in conventional turbine and compressor blades for these inducers?
2-What is the blade tip and blade hub angle on them geometry?
3- What is the lean angle?
4-What is the stagger angle on these blades?
5-How any can define sweap angle on these?
6- the thickness of this blades how is defined?
7- Where are the leading edge and trailing edge of this blades?
8-How is defined the solidity for this blades and what is difference between it and pitch of blade?can solidity be the variable form hub to tip?
9-(Very Important)-Chord of these blades how defined?
10-Chord length in these blades how defined?What is the length of the chord in the tip and the hub?
11-Number of blades in an inducer how are counted?
Finally, I've attached an example of the Inducer geometry.Please specify the answer on this geometry or any other geometry that you think it's better to understand me.
Thanks everyone who answers these questions.
Milad Asiyaban

 

[Artisi]

Ask your lecturer for the design / reference books you should be studying to answer these questions.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[LittleInch]

You seem to be confusing pumps ( liquid) with compressors and turbines in question 1.

You would need to ask the manufacturer, but in general they will determine these aspects based on a mixture of specific fluid information ( flow, viscosity etc) and decades of experience.

I've never seen anything quite like your inducer before which looks suitable for some really viscous material.

a simple google search on "centrifugal pump inducer design" opens up a vast array of technical information. The McNally institute have some good data.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Artisi]

LI:nothing fancy about the inducer picture shown, fairly standard design / configuration.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[LittleInch]

Artisi - I don't doubt it - most I've personally seen were much coarser pitch.

My point is that they are made specific to the fluid / flow / NPSH etc.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[EdStainless]

I agree with LI, All of the ones that I have worked with were much steeper than this.
But then I was always working in water/crude oil systems.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[RezaFarrokhi]

Thank you for all the answers you gave.

a simple google search on "centrifugal pump inducer design" opens up a vast array of technical information

There is not much information you can get from Google Search., and I've looked at this way before I put my question here.
But my problem is still alright.

Milad Asiyaban