14 Replies Latest reply on Nov 27, 2018 3:01 AM by Олег Перлик

# how can calculate the torque produced by a cross flow turbune driven by water?

im designing a cross flow turbine for micro hydro using solidwork 2014 and i want to know the torque it will produce in the turbine shaft how would i do this in solidworks 2014?

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

Hi Haha Hoho:

Do you have SolidWorks Flow Simulation?

That is the correct tool for you to simulate your turbine.

SOLIDWORKS Flow Simulation | SOLIDWORKS

And before you post any question, please search within the SolidWorks Forum first. I guess there are people already asked similar questions as you.

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

yes sir i have a flow simulation sir.

i watched the video and search so many tutorials but its not what im looking for it cause im the one who specify the angular velocity which is not true in real situation for microhydros.

here is the situation a water flowing through a pipe from a high head in it will hit the turbine causing the turbine to rotate and i want the determine the rpm and the torque of the turbine being produce, from the of the flowing water.

thank you.

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

this cannot be done in flow

the closest you will get is rotate the turbine at a particular rpm, measure torque.

change rpm, measure torque again.

when torque = 0, you have found the RPM that the turbine will spin at.

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

Wow Interesting sir,

Im always searching to find the answer in my question sir, now i know that in can not be done in flow.

I thought it can be done to maximize the full potential of the hydro system sir.

so basically sir if the toque = 0 that the rpm to rotate the turbine sir.

And sir can you give some tutorials to do this, cause i cannot make the torque = 0 sir.

Thankyou sir!

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?
XFlow is a good code for this sort of unsteady problem. Or you could try to get your hands on one of the double multiple stream tube codes that were developed for cross flow wind machines back in the '70s & 80's. The NRC in Canada (Low Speed Aero - South, Rangi & Templin) and Sandia National Labs (Klimas, Sutherland, Berg I think) were notable hot spots for a lot of this type of work.
• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

where are you stuck exactly?

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

Sir, i dont know how to set up my solidworks flow simulation so that i will find out the rpm and torque of the turbine with respect to the head and flow of the water that will spin the turbine.

What i always do is that i design the turbine install it after that i will measure the rpm and torque of the turbine, then from that data i will decide what generator is to used and to design how the gear box is set up to meet the rpm of the generator to produce electricity.

so in order to reduce this works im thinking that solidworks flow simulation will could help. so that in the process off designing i could already estimate the rpm and torque of the turbine so i could determined the generator and gearbox and other accessories to be used sir.

sir you can view this video sir, thank you sir

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

It looks like a Pelton wheel in the video. They are the most efficient turbine, if I recall correctly, when heads approach something like +300m. For low heads you might want to consider a different style but I realize there maybe other constraints on your problem. A Frances of Kaplan style which as far as I am aware work quite efficiently at low heads and they can be analyzed with Flow Simulation as they are well suited to the rotating frame approximation. The impulse or Pelton wheel turbine is tricky however the XFlow program could handle this problem and it can be rented on a per use basis through a cloud offering I believe they have. This is not my area of expertise so you should check the above out if you give it serious consideration. You can probably do a pretty decent job of developing an equation (first principles approach) to estimating the performance of a pelton wheel or just do a search on the web  - I think they are pretty easy to figure out and are well understood as well. This Wikipedia entry has what you need: Pelton wheel - Wikipedia, the free encyclopedia as far as I looked which wasn't far.

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

Sir i used cross flow turbine for my micro hydros design because of ease of contruction.

But pelton also is interesting im planning to try this in my other design sir,

thank you sir!

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

you can figure out rpm using the method i described

but i don't see how you can measure torque without a resistance

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

sir do you have tutorials on how i would do the method you described sir?

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

unfortunately there are not tutorials for everything out there.

this is really a straight forward analysis

setup a rotating region problem

then change the flow rates and measure the torque

if this is something your company is interested in getting some training on, don't hesitate to contact us at www.hawkridgesys.com

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

thankyou sir!

• ###### Re: how can calculate the torque produced by a cross flow turbune driven by water?

Hello! I need to find RPM.

Torque must = 0.

What to look at? Figure below.

1 Current Value?

2 Criterion?

3 Averaged Value?

4 Minimum value?

5 Maximum Value?

6 Delta?