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Questions and Answers
What is the function of the combustion chamber in gas turbines?
What is the function of the combustion chamber in gas turbines?
- To regulate the speed of the gas turbine
- To cool down the high-pressure air before mixing it with fuel (correct)
- To supply air at sufficient pressure to the combustors
- To convert hot-gas flow into rotational mechanical energy
Which type of compressor is generally limited to two stages due to efficiency loss?
Which type of compressor is generally limited to two stages due to efficiency loss?
- Axial flow compressors
- None of the above
- Both types of compressors
- Centrifugal compressors (correct)
Which type of compressor is generally limited to two stages due to efficiency loss?
Which type of compressor is generally limited to two stages due to efficiency loss?
- Both types of compressors
- Centrifugal compressors (correct)
- Axial flow compressors
- None of the above
What percentage of air from the compressor is used for combustion?
What percentage of air from the compressor is used for combustion?
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What determines the speed of the gas turbine in a combustion chamber?
What determines the speed of the gas turbine in a combustion chamber?
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Study Notes
- Envelopes and sleeves form the cylinder of an engine.
- Sleeves are the walls of the combustion chamber and are subject to high wear.
- There are two main types of removable sleeves: wet and dry.
- Removable sleeves allow for easier maintenance and reduce costs.
- Sleeves must resist the pressure of the cooling water circuit and allow for laminar flow.
- Wet sleeves have difficulty cooling the upper part, but tangential boring has improved this.
- Cavitation erosion of the sleeve's external surface can be minimized with water treatment, special coatings, or a tighter piston-sleeve clearance.
- Sleeves must be made of appropriate materials to withstand wear and tear.
- Sleeves play a role in controlling lubrication and act as "intake and exhaust valves" in 2-stroke engines.
- Removable sleeves can reduce the size and complexity of cylinder blocks.
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