Comparison of modelling approaches and layouts for solar chimney turbines

Summary

Turbine configurations for solar updraft power stations are evaluated through analytical modelling and optimisation: one rotor or two contra-rotating rotors, each optionally preceded by stators. Analysing multiple blade spans and limiting hub reaction alters predicted efficiency considerably. A lone rotor lacking stators performs badly, while contra-rotating machines achieve the best efficiency but spin slowly, demanding higher torque.

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