Combustion

Question 1

The diffuser has the

Answer 1

Highest pressure in the engine

Question 2

When air combusted it reaches a temp of

Answer 2

2100 degrees Celsius which is too hot for the turbines so secondary air is added twice

Question 3

At what temperature do gases leave the combustor

Answer 3

1000-1500 degrees Celsius

Question 4

What percentage of air is used for the primary combustion from the diffuser

Answer 4

20%

Question 5

80% of the air from the diffuser

Answer 5

Acts as the secondary air and flows around the tubes

Question 6

Tubo annular combustion chamber is

Answer 6

Individual flame tubes inside a single air casing
Means it’s lighter and more compact

Question 7

Reverse flow annular combustor

Answer 7

Shorter engine
Reverse flow leads to loss of efficiency

Question 8

Simplex nozzle

Answer 8

Inefficient at low rpm and operate at low pressures so not useful for CAT

Question 9

A spring loaded drain valve

Answer 9

Drains unburned fuel in the combustion section to prevent a hot start

Question 10

Spring loaded drain valves

Answer 10

Held shut by the pressure of combustion

Question 11

High energy ignition system is operated

Answer 11

During engine starting and when using contaminated runways

Question 12

HEUI - ignition system

Answer 12

Short periods - 12 joules
Continuous ignition periods - 3-6 joules

Question 13

Addition of heat in a combustion chamber allows

Answer 13

Large expansion at a substantially constant pressure

Question 14

Annular combustion system

Answer 14

There are no flame propagation problems during engine start