Modern aircraft gas turbine engines have pressure ratios of 30 or higher. Take that value with...

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Modern aircraft gas turbine engines have pressure ratios of 30 or higher. Take that value with compressor inlet conditions of 1 bar and 300 K and a turbine inlet temperature of 1700 K and calculate the cycle efficiency. Then calculate the back work ratio. Assume the compressor and turbine are ideal. What is the entropy generation for the compressor and for the turbine? 2.
	
Document Preview: ME 200 Summer 2012 
Homework 27 
Assigned Thursday 26 Jul 2012 
Due Monday 30 Jul 2012 @730 am in Room 1130 ME 
 
1. Modern aircraft gas turbine engines have pressure ratios of 30 or higher.  Take that value 
with compressor inlet conditions of 1 bar and 300 K and a turbine inlet temperature of 
1700 K and calculate the cycle efficiency.  Then calculate the back work ratio.  Assume 
the compressor and turbine are ideal.  What is the entropy generation for the compressor 
and for the turbine? 
 
2. Compressor technology has progressed further than turbine technology so compressor 
isentropic efficiencies approach 98% while those for turbines are nearer 92%.  Repeat all 
calculations for problem 1 above using these values for ? ? ? ? and ? ? ? ? . 
turb comp

Robert · Accepted Answer

ANSWER 1:-
HERE r p = 30 ; k = 1.4  
Placing the values in equation we get  
 cycle efficiency = 62.15 %
Wc is depending on the parameters 300 K and pressure of 1 bar  
While W T depending on the parameters 1700 K and 30  bar  
Solving we get back work ratio = 0.743
ANSWER 2:

Modern aircraft gas turbine engines have pressure ratios of 30 or higher. Take that value with compressor inlet conditions of 1 bar and 300 K and a turbine inlet temperature of 1700 K and calculate...

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