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  1. jpblomberg

    What is optimum number of propeller blades

    Thanks for all of your responses, I guess I think thinking of the question more in terms of energy balance. For the case of a wind mill: The propeller disk sweeps out a certain circular area A. The air moving past it has density and speed. Given these, one can estimate the maximum potential...
  2. jpblomberg

    What is optimum number of propeller blades

    I have been thinking about how to optimize number of blades for a given propeller application. I realize there are many applications for them so let me narrow this down somewhat. Case 1: Most of the large electrical wind turbine generators have three blades. This number is arrived at...
  3. jpblomberg

    Do I use Enthalpy or Internal Energy (or flip a coin)?

    Hello all, When I am solving a thermodynamics (energy of compressed gas/liquid) problem, which cases should I use Enthalpy and which cases for Internal Energy? It has been 11 years since I took thermodynamics and I don't remember which one should be used. Things I do remember: The Internal...
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