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Research Papers: Energy Systems Analysis

Extending “Assessment of Tesla Turbine Performance” Model for Sensitivity-Focused Experimental Design

[+] Author and Article Information
Matthew J. Traum

Mem. ASME
Engineer Inc,
4832 NW 76th Rd,
Gainesville, FL 32653
e-mail: mtraum@alum.mit.edu

Fatemeh Hadi

Mem. ASME
Mechanical and Manufacturing
Engineering Department,
Tennessee State University,
3500 John A. Merritt Blvd,
Nashville, TN 37209-1561
e-mail: fhadi@tnstate.edu

Muhammad K. Akbar

Mem. ASME
Mechanical and Manufacturing
Engineering Department,
Tennessee State University,
3500 John A. Merritt Blvd,
Nashville, TN 37209-1561
e-mail: makbar@tnstate.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 11, 2017; final manuscript received September 18, 2017; published online October 17, 2017. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 140(3), 032005 (Oct 17, 2017) (7 pages) Paper No: JERT-17-1488; doi: 10.1115/1.4037967 History: Received September 11, 2017; Revised September 18, 2017

The analytical model of Carey is extended and clarified for modeling Tesla turbine performance. The extended model retains differentiability, making it useful for rapid evaluation of engineering design decisions. Several clarifications are provided including a quantitative limitation on the model’s Reynolds number range; a derivation for output shaft torque and power that shows a match to the axial Euler Turbine Equation; eliminating the possibility of tangential disk velocity exceeding inlet working fluid velocity; and introducing a geometric nozzle height parameter. While nozzle geometry is limited to a slot providing identical flow velocity to each channel, variable nozzle height enables this velocity to be controlled by the turbine designer as the flow need not be choked. To illustrate the utility of this improvement, a numerical study of turbine performance with respect to variable nozzle height is provided. Since the extended model is differentiable, power sensitivity to design parameters can be quickly evaluated—a feature important when the main design goal is maximizing measurement sensitivity. The derivatives indicate two important results. First, the derivative of power with respect to Reynolds number for a turbine in the practical design range remains nearly constant over the whole laminar operating range. So, for a given working fluid mass flow rate, Tesla turbine power output is equally sensitive to variation in working fluid physical properties. Second, turbine power sensitivity increases as wetted disk area decreases; there is a design trade-off here between maximizing power output and maximizing power sensitivity.

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Figures

Grahic Jump Location
Fig. 1

Velocity vectors at the inlet and outlet of the Tesla turbine

Grahic Jump Location
Fig. 2

Nozzle orifice schematic

Grahic Jump Location
Fig. 3

Tesla turbine efficiency dependence on the ratio of rotor disk radii and Reynolds number. This result is consistent with plots in Carey [1].

Grahic Jump Location
Fig. 4

Tesla turbine efficiency dependence on nozzle height, h, and mass flow rate, m˙, differs due to the way these parameters impact v-θ,o and v-k,r

Grahic Jump Location
Fig. 5

The derivative of turbine efficiency (dimensionless power) with respect to ξ plotted for laminar Reynolds numbers

Grahic Jump Location
Fig. 6

The derivative of turbine efficiency (dimensionless power) with respect to Rem plotted for 0.1 = ξ and 0.1 < ξ < 0.9 at 0.1 increments

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