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Turbine4_CL

 

 

The function Turbine4_CL(n_s) uses a curve fit to the Balje curve peak to provide the optimal value of specific diameter for a turbine given the specific speed.  These curves were developed in:

Sondelski, Becky, Mass Optimization of a Supercritical CO2 Brayton Cycle with a Direct Cooled Nuclear Reactor for Space Surface Power, M.S. Thesis, Dept. of Mechanical Engineering, UW-Madison, (2019).

and are based on the Balje curves presented in Balje, O.E., Turbomachinery, New York, Wiley & Sons, (1981). 

The calling protocol is:

 

Turbine4_CL(n_s)

 

Inputs:

n_s = specific speed (rad) = omega*sqrt(V_dot)/Dh_s^0.75

 

Output:

d_s = specific diameter (-) = D*Dh_s^0.25/sqrt(V_dot)

 

Note that the companion function Turbine3_CL provides the efficiency as a function of specific speed and specific diameter.

 

Example: 

$Load Component Library

n_s=1

d_s=Turbine4_CL(n_s)

eta_max=-999

eta = Turbine3_CL(n_s, d_s, eta_max)

{d_s = 2.34, eta = 0.6955}