Exam 3

Question 1

Pulse Jet

Answer 1

uses shutters and springs to pack air into combustion chamber and ignite the engine.

Question 2

Ram Jet

Answer 2

Simplest of Jet Engines, No moving parts

Question 3

Rocket Engine

Answer 3

In their simplest forms are a tube with gun powder, thrust is made from the reaction

Question 4

Reaction Turbine

Answer 4

1. Changes speed and direction of gases
2. As gas passes between turbine blades cross-sectional area gets smaller
3. Increased velocity = decrease pressure
4. Turbine absorbs the energy to change gas velocity
5. Since engine efficiency goes up w/ higher combustion temps special cooling must be provided to the turbine.

Question 5

Impulse Turbine

Answer 5

1. Pressure and speed of gases remain the same
2. Only change is in direction of flow
3. Turbine absorbs the energy required to change the direction of the high speed gas

Question 6

Compressor Stall

Answer 6

• Inlet velocity and rotational velocity imbalance

- AoA exceeds critical AoA

Question 7

Convergent Duct

Answer 7

Velocity- Increasing
Pressure - decreasing
Temp- decreasing

Question 8

Divergent Duct

Answer 8

Velo- decreasing
Pressure- increasing
Temp- Increasing

Question 9

Gas Turbine Engine Construction

Answer 9

1. Inlets
2. Fans and compressors
3. Combustion Section
4. Exhaust and nozzles
5. Thrust reversers

Question 10

ADVANTAGES OF GAS TURBINE ENGINES OVER RECIPROCATING ENGINES

Answer 10

1. Development time is reduced
2. Production is simpler and quicker
3. An existing turbine engine can be scaled up or down in size
4. Power is produced continuously rather than intermittently therefor the working pressures are low and engine is lighter
5. Engine vibration is eliminated
6. Higher operating speeds can be attained and frontal area is reduced
7. Power to weight ratio is increased.
8. Operates more efficiently at a higher altitude (needs no supercharging)
9. The higher the RPM, the more efficient the turbine engine functions.

Question 11

Brayton Cycle

Answer 11

Constant pressure cycle, used to define the events that take place in a gas turbine engine

Question 12

Turboshaft Engine

Answer 12

A gas turbine engine that delivers power through a shaft to drive something other than a propeller
Used for helicopters and apu’s

Question 13

Turboprop Engine

Answer 13

Drives a conventional propeller through reduction gears

-prop and engine accelerate air

Question 14

Turbofan Engine

Answer 14

Essentially a ducted multi bladed propeller driven by a gas turbine
-cross between turbojet and turboprop

Question 15

Turbojet Engine

Answer 15

Produces thrust through the hot gases exiting the exhaust section of the engine

Question 16

Major sections of a Turbojet Engine

Answer 16

1. Compressor
2. Combustion
3. Turbine Section
4. Nozzle Section

Question 17

Principles of Gas Turbine Engines

Answer 17

1. Air is brought to front and compressed
2. Fuel is mixed w/ the compressed air
3. The compressed fuel air mix is burned
4. Heated exhaust gases rush out of the engine

Question 18

1791

Answer 18

John Barber first patent of a gas turbine engine

Question 19

1808

Answer 19

John Bumble gas turbine w/ rotating blades

Question 20

1850

Answer 20

W.F. Fernihough developed steam and gas turbine engine

Question 21

1930

Answer 21

Frank Whittlle patented first turbojet a/c

Question 22

1936

Answer 22

Power Jets Founded and first German patented engine for jet propulsion

Question 23

1939

Answer 23

First jet propulsion flight

Question 24

1937

Answer 24

First successful test stand of pure reaction turbojet

Question 25

1941

Answer 25

first test flight with a turbojet

Question 26

1948

Answer 26

Commercial airline industry began

Question 27

1958

Answer 27

Boeing 707

Question 28

1976

Answer 28

British and French Concorde

Question 29

1629

Answer 29

Branca’s Stamping Mill