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"Tesla turbomachines have found wide ranging applications...
This paper attempts to present the outcomes of research carried out by various researchers during the last four decades...
A summary of the modeling, simulation, and experimental procedures used to understand Tesla machines is presented...
Embodiments of the invention exploit the natural physical properties of fluids to create a more efficient means of driving fluids as well as transferring power from propelled fluids. In 2003 Scott D. O’Hearen took a patent on Radial turbine blade system. This invention utilizes a combination of the concepts of a smooth runner surface for working fluid frictional contact and that of blades projecting axially from plural transverse runner faces."

Author, Harikishan Gupta E., & Author, Shyam P. Kodali (2013). Design and Operation of Tesla Turbo machine - A state of the art review. International Journal of Advanced Transport Phenomena, 2(1), 2-3.

"In U.S. patent 0053909 from 2003, there are airfoils between discs. Airfoils are placed in such manner, that they guide fluid flow toward a central opening that acts as exhaust. Fluid flows through nozzles, that direct fluid between discs and on leading edges of airfoils. Momentum is exchanged through mechanisms: fluid flow strikes the leading surface of airfoils, fluid flow around airfoils produces lift on them and viscous interaction between disc surface and fluid. They all contribute to rotational output, for lift on an airfoil is perpendicular to freestream velocity. Only some airfoils extend from outer edge of the disc to the outer edge of exhaust outlet, because we have to have enough opening area for exhaust gasses. Shaft can be connected to one of the outer discs, that does not have a central opening, and exhaust gasses leave the turbine from space between this and adjacent disc. Such turbines can be made of composite materials. It has only few moving parts (cheaper manufacture) and lubrication is required only for shaft bearings (environmentally friendly). Because discs are connected through airfoil shaped parts, they are more resistant to deformations at higher angular speeds. It is intended for use in turbine engines."

Author, Matej Podergajs, & Advisor, Dr. Rudolf Podgornik (2011). The Tesla Turbine. University of Ljubljana Faculty of Mathematics and Physics, 11-12, 14.

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