Dear groupmembers,
Please the message by Samuel below.
Answers to him directly at [EMAIL PROTECTED], cc to the group when
relevant.
Kind regards,
Wim Klunne
group moderator
----- Forwarded message from samboy_01_04 <[EMAIL PROTECTED]> -----
Date: Thu, 09 Sep 2004 14:34:14 -0000
From: samboy_01_04 <[EMAIL PROTECTED]>
Reply-To: samboy_01_04 <[EMAIL PROTECTED]>
Subject: Help in designing Propeller turbine
To: [EMAIL PROTECTED]
Hi
I am a student from Papua New Guinea, and am currently working on a
small scale model of a propeller turbine.
So far, after much reading and surfing the net, I have not been able
to accumulate enough data for my design. The following is data I
have been able to obtain so far:
Head: 2.5m; Flow rate: 5L/s ; theoretical power output: 123
W;Specific speed:168
Runner diameter: 6cm Speed of Rotation: N=1300rpm.
Pitch angle; 12�, this was from a formula used for fans.
The following are my own assumptions: hub to tip ratio: 0.2
Number of blades: 4
At the moment I am thinking of just making a jig to twist the baldes
at an angle of 45�. However I have read that the angle of twist can
be calculated, as there is no guide vane, the flow is axial, and
hence I would specifically like some information regarding the
construction of velocity triangles and also some of the losses which
will be incurred. I am particularly interested in the turbine design
(propeller turbine). The turbine only needs to produce
approximately 6W, this will be generaeted by a dynamo attached to it.
The model is to demonstrate the principles of hydropower to students
in high school.
Your cooperation in this matter is very highly appreciated.
Samuel SAM
----- End forwarded message -----
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