15.5 Combustion

Question 1

What components make up a combustion chamber

Answer 1

Casing
Flame tube

Question 2

What is the ideal fuel mixture with air

Answer 2

15 parts air to 1 part fuel, 15:1

Question 3

What two parts is airflow split into and what are the percentages

Answer 3

Primary for combustion, 20-30%
Secondary for cooling, 70-80%

Question 4

What is the different between can-type and can-annular combustion chambers

Answer 4

Can type have individual casings and flame tubes
Can annular have one outer and inner casing and have individual flame tubes

Question 5

What characteristic does an annular type have

Answer 5

One annular outer and inner casing and one flame tube

Question 6

Two types of cooling and how it works

Answer 6

Film cooling - creates film on inner surface of liner
Transpiration - airflow enters the flame tube through radial holes in the liner. This air then flows through the gap between the liner segments and the liner.

Question 7

What are the main pollutants

Answer 7

Hydrocarbons, carbon monoxide, nitrogen oxide