WorksheetsGAS TURBINE
Total questions: 13
Worksheet time: 4hrs 20mins
Analyze the impact of regeneration on the performance and design of an open cycle gas turbine.
Reduces compressor work, improves net output
More power output via second combustion stage
Saves fuel by reclaiming exhaust heat
What thermodynamic cycle does a gas turbine operate on?
Otto Cycle
Diesel Cycle
Brayton Cycle
Rankine Cycle
What is the main purpose of the compressor in a gas turbine?
Burn fuel
Increase pressure of incoming air
Exhaust hot gases
Generate electricity
Which of the following is an advantage of gas turbines in marine application?
Low maintenance cost
High power-to-weight ratio
Operates efficiently at low loads
Low fuel consumption
What component follows immediately after the combustion chamber in a gas turbine?
Air intake
Exhaust
Turbine
Intercooler
In a two-shaft gas turbine, the power turbine is:
Mechanically coupled to the gas generator
Directly connected to the starter motor
Independent from the gas generator shaft
Only used during startup
Gas turbines are more efficient at partial loads compared to diesel engines.
TRUE
FALSE
The exhaust in a gas turbine is responsible for discharging hot gases after energy extraction.
TRUE
FALSE
Describe engineering methods (Intercooling) used to improve the thermal efficiency of an open cycle gas turbine
Reduces the work required by the compressor by cooling the air between compression stages, resulting in improved net work output.
Involves heating the working fluid again between turbine stages to extract more energy, increasing thermal efficiency.
Recovers waste heat from exhaust gases to preheat the compressed air before combustion, thus reducing fuel consumption.
Describe engineering methods ( Regeneration) used to improve the thermal efficiency of an open cycle gas turbine. Support your answer with a brief explanation for each method.
Recovers waste heat from exhaust gases to preheat the compressed air before combustion, thus reducing fuel consumption.
Involves heating the working fluid again between turbine stages to extract more energy, increasing thermal efficiency.
Compare and analyze the operational advantages of using gas turbines versus diesel engines in ship propulsion.
High power-to-weight ratio
Faster start-up and shut-down
Fewer moving parts = less mechanical wear
High, especially at low load
Less efficient at partial loads
Refer to method of improving thermal efficiency of open cycle gas turbine (Reheating), explain the process at stage,1-2
Expansion in HP Turbine
Compression in compressor
Expansion in LP turbine
Heat addition in reheater
THREE equipment using in open Cycle Gas Turbine
Compressor
Turbine
Combustion Chamber
Heat Exchanger
