Abstract
In this paper, the optimization of single stage axial flow ammonia turbine for OTEC (Ocean Thermal Energy Conversion) is carried out by the Hooke & Jeeves' Pattern Search Method and the Powell Method (the method of steepest descent). The parameters in the objective function (turbine efficiency) consist of specific speed, specific diameter, nozzle outlet angle, ratio of blade to diameter, number of nozzle blades and rotor blades. The results of maximum efficiency of turbine, optimum rotational speed, optimum mass flow rate of working fluid, etc are shown for a turbine of gross power output between 1 MW and 25 MW.
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