×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Question about Pump Inducer Nomenclature

## Question about Pump Inducer Nomenclature

(OP)
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.

### RE: Question about Pump Inducer Nomenclature

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.)

### RE: Question about Pump Inducer Nomenclature

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.

### RE: Question about Pump Inducer Nomenclature

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.)

### RE: Question about Pump Inducer Nomenclature

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.

### RE: Question about Pump Inducer Nomenclature

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

### RE: Question about Pump Inducer Nomenclature

(OP)
Thank you for all the answers you gave.

#### Quote (LittleInch)

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.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

#### Resources

White Paper – Choosing the Right Spring Loaded Connector
In today’s cost-sensitive world, designers are often driven to specify the lowest cost solution for every aspect of their designs to ensure that their solution is competitively priced and their company remains profitable. However, specifying a low-cost, low-quality connector solution can result in premature failure, considerable re-work costs and damage to reputations. Download Now
eBook – Own the Lifecycle: Sustainable Business Transformation
Increasingly, product and services companies are seeking more information and control in the operational lifecycle of their products, including service and use. Better information about the operational lifecycle, and the ability to use that information, requires more than just unstructured data flowing back from products in the field. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!