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Axial Turbine Studies: • Efficiency determined from basic “meanline” design procedure. • Inputs: Max. AN2, Rh/Rt, Cpdif, mass flow,TIT, map ηtt vs ∆H/U2,Va/U • Outputs: ηts, Speed => Comp Ns. Turbine “drives” study via speed. • At low TIT, Rc Etat(rad) ~ Etat(ax). At high TIT, Rc Etat(rad) << Etat(ax). • Optimum axial turbine speed much less than optimum compressor speed. Compressor Efficiency suffers with axial turbine. • Rc too high for 1stage axial Radial 2-Axial kW 200 200 TET 1500 1500 Rc 5.1 5.1 Eff. Turb. 81.8 83.6 Eff. Comp. 81.0 77.5 System Eff. 36.4 36.3 N 81152 51448 Radial 2-Axial kW 150 150 TET 1185 1185 Rc 5.0 5.0 Eff. Turb. 84.6 84.5 Eff. Comp. 81.0 78.1 System Eff. 32.9 31.4 N 80398 51449 Cycle Selection + Approach: • Primary constraints 30” Recuperator OD Maximum TET = 1185F Maximum TIT = 1750F Low risk • High Efficiency Approach Increase TET at same speed (significantly increased power) • Improved generator, power electronics Increase TET, decrease speed, maintain power level Increase TET, trim turbine and compressor, maintain power level • Modified compressor, turbine, diffuser, nozzle • De-rate approach Reduce TET Reduce speed Reduce speed and TET 8PDF Image | Final Technical Report Advanced MicroTurbine System (AMTS) -C200 MicroTurbine -Ultra-Low Emissions MicroTurbine
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