How To Understand The Power Cycle Of A Gas Turbine
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1 Gas Turbine cycles and Propulsion system Sarika Goel 3 rd year,chemical Engineering, IIT Delhi Guide : Prof. Gautam Biswas & Prof. S. Sarkar
2 Outline Introduction- Gas turbine cycles Applications of gas turbines Brayton cycle and its analysis Improvements in brayton cycle Irreversibilities involved in analysis Types of Jet engine and thrust calculations Conclusions
3 Introduction Gas turbine cycles
4 Schematic diagram of Gas turbine
5 Components of gas turbines Inlet : Determine the amount of air flow into an engine Suck in as much of the air coming towards it as possible Compressor : Used to squeeze the air, or to increase the pressure of the air flow
6 Combustor: Air is mixed with a highly flammable fuel and ignited hot, high pressure air exiting the burner becomes the primary source of the exhaust gases Turbine: High pressure gases drop in pressure The velocity of the flow increases
7 Nozzle : The exhaust gases continue to increase their velocity
8 Pressure variation intake compressor condensor turbine nozzle
9 Temperature variation intake compressor condenser turbine nozzle
10 Uses of Gas Turbine cycles Electric power generation Aircraft propulsion and Jet Engine applications
11 Electric power generation Closed cycle Some work is used to drive the compressor and rest is used for power generation
12 Jet engine Operate on Newton's third law Jet sucks air into the front, squeezes it, ignites it with fuel and finally after exit comes out as exhaust The same opposite force pushes the jet forward as that of the exhaust
13 Brayton cycle (closed) Reversible processes Isentropic compression Constant P heat addition Constant P heat rejection Isentropic expansion
14 Air standard cycle Brayton cycle
15 Why go for Brayton cycle? To find the upper limit of performance of individual components
16 Brayton cycle
17 Brayton cycle analysis Efficiency: η = w q net in Net work: w net = w turb w comp
18 Efficiency: in net q w η = ) h (h ) h (h ) h (h = ) h (h ) h (h η = Assumption of cold air conditions : ) T (T c T ) (T c p 1 4 p η = ( ) ( ) 1 T T 1 T T T T η = Isentropic relationships: T T p p k k = ; T T p p p p k k k k = =
19 P 2 r p = pressure ratio = = P1 P P 3 4 Relation of temperature ratios to the pressure ratio: T T 2 1 = r ( k 1) p k = T T 3 4 So, efficiency : η = 1 1 r p ( k 1) k
20 Efficiency with pressure ratio As the pressure ratio rises, the efficiency also rises.
21 Specific work output : w net = w turb w comp w net = (h3 h 4) (h 2 h1) W W
22 Net work with pressure ratio For fixed values of Tmin and Tmax, the net work of the Brayton cycle first increases with the pressure ratio,reaches a maximum and finally decreases.
23 Improvements in Brayton cycle Exhaust heat exchanger Inter-cooling Reheating
24 Cycle with Exhaust Heat Exchange
25
26 Efficiency is more The specific output does not change
27 Gas Turbine Cycle with Reheat
28 The specific work output The heat supplied to the cycle Thus, the cycle efficiency Increase in work output
29 Specific work output increases Efficiency decreases
30 Gas Turbine Cycle with Inter-cooling
31 Specific work output = Heat supplied = Thus,
32 Specific output of the plant increases Efficiency decreases
33 Multiple inter-cooling and reheating Compression and expansion processes tend to be isothermal Efficiency approaches to Carnot cycle
34 Actual Gas Turbine Cycle Efficiency of the compression and expansion processes Pressure losses Incomplete heat exchange in the regenerator Mechanical losses due to bearings auxiliary etc Variation of Specific heat of the working fluid with temperature Variable mass flow throughout the cycle
35 Effect of irreversibilities on cycle
36 Types of jet engines Turbojet Turboprop Turbofan Ramjet
37 Turboprop engine Most gas is expanded in turbine to drive the compressor and propeller Used only for low speed aircraft like cargo planes because propellers become less efficient as the speed of the aircraft increases.
38 Turbofan Engine Turbofan gets some of its thrust from the core and some from the fan They produce high thrust and are good fuel efficient
39 Thrust calculations
40 Turbojet thrust
41 Turboprop thrust
42 Turbofan thrust
43 Conclusions Brayton cycle is an important tool to analyze the aircraft propulsion and power generation in a plant. Heat exchanger increases the efficiency. Intercooling and reheating increases the work output. Turboprop is used for low velocity applications and turbofan is used for high velocity applications.
44 Thank you
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