1. Air ratio
2. Pressure ration
3. Work Ratio
4. Compressor efficiency
5. Engine efficiency
6. Machine efficiency
7. Combustion efficiency
8. Thermal efficiency

**Gas Turbine **

**1.
****Air
ratio **

**2.
****Pressure
ration **

**3.
****Work
Ratio **

**4.
****Compressor
efficiency **

**5.
****Engine
efficiency **

**6.
****Machine
efficiency **

**7.
****Combustion
efficiency **

**8.
****Thermal
efficiency **

Some of
the important terms used to measure performance of a gas turbine are defined as
follows:

**1.
****Pressure
ratio. **It is the
ratio of cycle’shighest to its lowest pressure, usually highest** **pressure-compressor
discharges to the lowest-pressure-compressor inlet pressures.

**2.
****Work
ratio. **It is the
ratio of network output to the total work developed in the turbine** **or
turbines.

**3.
****Air
ratio. **Kg of air
entering the compressor inlet per unit of cycle net output, for** **example,
kg/kWh.

**4.
****Compression
efficiency **It
is the ratio of work needed for ideal air compression through** **a given
pressure range to work actually used by the compressor.

**5.
****Engine
efficiency. **It
is the ratio of work actually developed by the turbine expanding** **hot
power gas through a given pressure range to that would be yielded for ideal expansion
conditions.

**6.
****Machine
efficiency. **It
is the collective term meaning both engine efficiency and** **compressor
efficiency of turbine and compressor efficiency of turbine and compressor,
respectively.

**7.
****Combustion
efficiency. **It
is the ratio of heat actually released by 1 kg of fuel to heat that** **would
be released by complete perfect combustion.

**8.
****Thermal
efficiency. **It
is the percentage of total energy input appearing as net work** **output of
the cycle.

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