2011•Journal of Engineering for Thermal Energy and PowerRequires access
Analysis of the Efficiency Characteristics of the Brayton Reheat Cycle
Fengrui Sun
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Abstract
In a gas turbine cycle,the working medium temperatue varies in a wide range and its specific heat also changes.By utilizing a numerical analytic method,studied were the efficiency characteristics of the Brayton reheat cycle under the condition of the specific heat of the working medium being changed.It has been found that there exist an optimum total efficiency of the device and its corresponding optimum pressure ratio.The influence of the temperature ratio of the cycle and the efficiency of the compressor and turbine on the optimal pressure ratio of the cycle and the optimal total efficiency of the device was also investigated.On this basis,the influencing extents on the efficiency of the compressor and turbine were compared and the mistakes existing in the currently available literatures were pointed out.The foregoing can offer certain guide for optimized design and selection of operating parameters of a gas turbine.