Q03 Gas turbines Combustion

Question 1

Drag the names into the correct places.

Question 2

The addition of heat in a combustion chamber allows a:
Select one:

a.Large expansion at a constant volume

b.Large expansion at a decreasing static pressure

c.Large expansion at a substantially constant pressure

d.Minimum expansion at a constant volume

Answer 2

c.Large expansion at a substantially constant pressure

Question 3

One advantage of an annular combustion chamber system is that
Select one:

a.The air casing area is greater.

b.There is unrestricted airflow at maximum rpm.

c.There are no flame propagation problems during engine start.

d.The diameter of the Fan-Casing is reduced.

Answer 3

c.There are no flame propagation problems during engine start.

Question 4

In a gas turbine combustion chamber;
Select one:

a.the gas pressure increases in an axial (downstream) direction

b.secondary air is required for cooling of the flame tube

c.the axial velocity of the gas stream is greatest behind the swirl vanes

d.the gas temperature is highest at the chamber outlet

Answer 4

b.secondary air is required for cooling of the flame tube

Question 5

Why does the airflow axial velocity drop so much in the combustion chamber?
Select one:

a.Due to the action of the Swirl vanes, Perforated flare and airflow from the sides.

b.Because combustion will slow down the gases.

c.Due to the action of the NGVs

d.Because the pressure drops so must the velocity because it is a divergent duct.

Answer 5

a.Due to the action of the Swirl vanes, Perforated flare and airflow from the sides.

Question 6

Which of the following combustion chamber types does not need a flame tube?
Select one:

a.Multi Can

b.Cannular

c.They all have flame tubes.

d.Annular

Answer 6

c.They all have flame tubes.