Exercise 21. Answer the questions

1. What does the gas turbine use to provide thrust?

2. What does the gas turbine consist of?

3. What basic types of rotary air compressors are there?

4. What are they driven by?

5. What is the function of the compressor?

6. What compressor gives more thrust?

7. What is the function of the combustion chamber?

8. What is the function of the turbine?

9. What does each stage of the turbine employ?

10. What systempasses the turbine discharge gases турбины to atmosphere?

11. What permits a higher gas temperature and a higher thermal efficiency?

Exercise 22. True or false?

1. The gas turbine engine is not a heat engine.

2. A gas turbine engine consists of a rotary air compressor with an air intake, one or more combustion chambers, a turbine, and an exhaust system.

3. There are four basic types of rotary air compressors.

4. Both types of compressors are driven by the combustion chambers.

5. The function of the compressor is to burn the air.

6. The centrifugal flow compressor consumes far more air than the axial compressor of the same frontal area.

7. The axial flow compressor can be designed to attain much higher pres­sure ratios.

8. The combustion chamberhas the diffi­cult task of burning large quantities of fuel with extensive volumes of air supplied by the compressor.

9. The turbine has the task of providing power to drive exhaust system.

10. The turbine consists of one stage.

11. The exhaust systempasses the turbine discharge gases to the aircraft at a velocity and in the required direction to provide thrust.

12. The use of liquid-cooled blades in the turbine assembly permits a higher gas temperature and a higher thermal efficiency.

Exercise 23. Do the power plant crossword.K

Across:

1. Rate of motion of a body.

2. A machine for compressing air.

3. Rate of doing work.

4. A strong stream of air issuing from an orifice.

5. The pushing or pulling force developed by an aircraft engine.

6. A device for propelling an aircraft that has blades on an engine-driven shaft.

7. A rotating vane in a rotary air compressor.

8. A cylindrical bar to transmit power to the compressor.

9. A stationary blade used to guide the flow of air.

10. The process of burning the air-fuel mixture.

Down:

13. The complete installation of engines with accessories that generates the motive power for an aircraft.

Exercise 24. Make the following sentences complete.

1. The function of the gas turbine engine is to …

2. The function of the turbine is to …

3. The function of the compressor is to …

4. The function of the combustion chamber is to …

5. The function of the exhaust system is to …

6. The function of the air-cooled blades is to …

ñ