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# Utilizing Flow Simulation To Calculate RPM in a Impeller, Torque maybe? Not typical to other examples..

Question asked by Mike Tkachuk on Jun 22, 2017
Latest reply on Jun 27, 2017 by Bill McEachern

Hi to all the members of the SolidWorks community!

I'll try to make this as short and simple as possible, as it has been taking me for a loop the past bit.

Background: I am currently finishing off my last year as a Mechanical Engineer. I have an Internship and have been challenged with the task to find the RPM of an Impeller which has been designed. I have done LOTS of research on this matter, I have seen multiple propellers utilizing "External"  analysis with both "Excluded cavities without flow conditions" and "Exclude internal space" checked as well as Rotation checked and ran multiple times with different combinations of Local regions averaging/ sliding and Global Regions ran as simulations. I have also researched and tried multiple ways of Rotating Regions and Flow Trajectories when comparing to other impellers, Turbines/windmills, props, blowers, heat-exchangers, tutorials etc.... and have come up empty handed.

The Problem:   When comparing to other examples such as props and Turbines. The RPM is always known, which allows you to utilize the Rotating Regions features. However I do not know the RPM as that is what I am trying to figure out. I do know fluid properties which can allow me to use the Boundary Conditions and set Goals from there. I am thinking one possibility would be to find Torque generated by the fluid acting on the impeller, and through formulas and an excel spread sheets, & further utilizing the Newtonian method, to cross reference with Solid works data and hopefully come up with a realistic numbers. I am not 100% sure of what analysis type I should be using as well ( Internal or External) or possibly motion/ fans. as I have yet to find an example that uses the fluid properties and goals to accurately depict the RPM of the object being rotated by the fluid.

I do have a target RPM of 200 and an inlet and outlet pressure as well as volume flow, fluid rotating will be water.

I look forward to hearing back from everyone whom maybe able to help or make any suggestions, maybe I am just over thinking/ analyzing this but I am at a standstill and thought i'd try to get some feed back!

Regards

Mike Tkachuk