TECHNICAL TERMS OF GAS TURBINES EXPLAINED !!

1.)AIRFOIL DRAG FORCE – Force acting on the airfoil in the direction of motion, represents frictional forces.

2.)AIRFOIL LIFT FORCE – Force acting on the airfoil in the direction perpendicular to the direction of motion. Basic force causing the aeroplane to maintain its lift.

3.)AIR RATE – Kilograms per second of airflow required per net horse powerdeveloped. Also called FLOWRATE.

4.)CLOSED CYCLE TURBINE – Turbine in which the working fluid does not come in contact with the atmospheric air and the heat to theworking fluid is provided in the heater by burning the fuel externally.

5.)COMPRESSOR MECHANICAL EFFICIENCY – Ratio of rotor horse power to shaft horse power supplied to the compressor.

6.)CONSTANT PRESSURE TURBINE – Turbine in which the fuel is burnt at constant pressure. Combustion is a continuous process.

7.)CONSTANT VOLUME TURBINE – Turbine in which the combustion takes place at constant volume. Also called EXPLOSION TYPE TURBINE.

8.)ISENTROPIC EFFICIENCY – Ratio of work to compress isentropically to the actual work to compress. Also the ratio of isentropic temperature rise to the actual temperature rise.

9.)POWER RATIO – Ratio of useful or net horse power of the cycle comparedwith the power developed by the turbine of the system. Also called WORK RATIO.

10.)RAM EFFECT – The effect which causes an increase of temperature and pressure of the air that enters the compressor of an aircraft gas turbine unit due to aircraft speed. Sometimes called RAM.