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sdfAIM: To perform performance tests over a range of loads for the Rover gas turbine, and evaluate its performance, comparing both theoretical and actual results. ...
Density of the air is found from the static temperature guess, using the perfect gas law;
The volume flow rate is then found according to manufacturers specifications;
The inlet velocity is;
Using a rearranged form of the total temperature formula;
Brake Power
Power at the brake is found from the load, output shaft speed and a brake constant to convert to SI units.
Compressor
The theoretical compressor outlet temperature can be found from the isentropic relationship;
Having obtained both the theoretical and actual temperatures across the compressor, efficiency can be calculated;
Work absorbed by the compressor is;
Maximum Temperature T3’
This temperature cannot be measured directly from the turbine due to the design of the combustion chamber and the combustion process. ...
Method 2
The temperature can also be determined by obtaining the thermal equivalent of the total turbine work, and adding the result to the gas outlet temperature;
For the following calculations the temperature calculated using method 2 will be used as T3’ as it is an approximation of the actual temperature based on the power produced (however still ignoring some real world effects such as heat lost; does not account for all heat generated during combustion). ...
Turbine
The theoretical temperature at the turbine outlet is found using the isentropic relationship;
Having calculated both ideal and actual temperatures across the turbine, the efficiency is defined as;
For the maximum load, using the theoretical maximum temperature, the efficiency is;
The turbine work output is then;
Unit’s Efficiencies
The actual thermal efficiency is;
The Brayton Air Standard Cycle efficiency is;
The unit’s work ratio;
Specific fuel consumption;
DISCUSSION: The four graphs can be found at the end of the discussion. ... As lines of constant pressure are divergent, increasing the maximum temperature will greatly increase the cycle efficiency, as the turbine work will increase, with compressor work constant.
Approximate Word count = 1582
Approximate Pages = 6.3
(250 words per page double spaced)
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