[shahryar]

Hello every body !

I am mechanical engineering student currently pursuing my BS in mechanical . I am doing project on Tesla turbine I have issues related to what are BC for Tesla turbine simulation . I want to know if anybody had done it successfully I want to use 6dof solver so can anybody guide me please . I am really tensed over it my time for project is slipping .

[sivakumar]

Hi,
The given info is not enough or I am not understanding it.

If possible try to give some more details.
So that I can try a bit.

Thx
Sivakumar

[shahryar]

hello sir !




First of all thanks for helping me out . I am very tensed about this project and that's the greatest favor you are doing to me. I have tried different ways to do it but I wasn't successful. May be you can do it and I can copy same conditions on my final optimized turbine.




Problem Description.:




Actually Tesla Turbine is blade less multi disc drag type turbine. That works on the principle of viscous shear of fluid. Fluid enters in turbine through the nozzle at outer periphery of the discs and passes through the disc gap between discs. As fluid passes through discs it applies shear force on the discs which cause discs to rotate. I am attaching working diagram and a working animation of turbine so it is more clear.




Problem Statement :




My project aims at analysis and optimizing turbine using ansys CFD . I have to see flow field base on gap between discs and nozzle angle and also on the velocity of fluid. I want to see how turbine reacts when fluid enters in the turbine and what are the rpms produced and the power produced. Outlet is pressure outlet and inlet is mass flow rate type with mass flow rate is 7.28 kg/s .




Casing contains 3 openings which is outlet and each disc contain holes from where fluid enters from one disc to other after completing its course in a single disc.







I hope this elaborate the problem if you want to ask anything please tell me.




here is the url of the video of turbine working




The Tesla Turbine & How it works














The Tesla Turbine & How it works

http://www.epicphysics.com/model-eng...a-turbine-kit/ The Tesla Turbine & How it works






Play











Thank You for your help

[Foxhunter]

Originally Posted by shahryar

hello sir !
each disc contain holes from where fluid enters from one disc to other after completing its course in a single disc.

This is wrong. The air moves over all discs at the same time. The air comes in from the outer side, and flows over all the discs. It is pushed outwards because of centrifugal force. The only way the air can go to the centre of the discs, and thus "escape", is to lose speed. Thus the air has to give speed to the discs. I can give you some drawings to explain it tomorrow, have to go now.

[Foxhunter]

A simple schematic to explain how it works.

In order to get to the exit, the resulting force(Red), has to be smaller then when it entered.
In order to do this, the speed(Speed force is green) has to go down. The Blue force will go down with the speed(Centrifugal force is linked to speed in this case).
Since energy cannot dissappear, the kinetic energy has to bleed off somewhere. It does this by transfering energy to the disks. The genius part of this turbine is the total surface of the disks. If, theoretically, the disks where infinitly thin, the surface would be infinite. This would result in a perfect turbine.

But realistically the disks have to be able to support the forces on them. The RPMs go into the thousands, the damage those things can do if they explode is immense. Look at grinder disks that broke off for example.

But I digress. Back to the first point, the air does not travel over each disk one at a time, the air flows over all of them at the same time.

I dont know how to simulate this in fluent, but if you have any more questions about the Tesla Turbine I will be happy to help!

[tufygo]

Originally Posted by shahryar

Hello every body !

I am mechanical engineering student currently pursuing my BS in mechanical . I am doing project on Tesla turbine I have issues related to what are BC for Tesla turbine simulation . I want to know if anybody had done it successfully I want to use 6dof solver so can anybody guide me please . I am really tensed over it my time for project is slipping .

Tesla Disc Turbine university last year project of mine and i have some diffuculties in disc project i am working on overset because of important of boundary layer did you finish your project ?