components-combustor

Question 1

what are the technical requirements of the combustor

Answer 1

• even temperature profile at end to maintain turbine
• maintain compressor via low stress
• emissions within ICAO standards
• dimensions: small volume, lightweight,
• keep hot gases inside
• ignite on ground and in air again
• small consumption (low total pressure loss)
• be fxn in all conditions (large thrust range)

Question 2

what is the design requirement of the combustor

Answer 2

average reaction time is less than the average residual time

Question 3

what are the three types of combustors?

Answer 3

pipe, ring, pipe-ring

Question 4

what are the disadvantages (and advantages)of pipe and ring that lead to mixed

Answer 4

pipe: -homogeneous exit temps
+cheap

ring: -expensive
- must replace all
- lighter
- homogenous temps

mixed: best o both

Question 5

what are the types of cooling, describe the developments (2 with one broken into 4)

Answer 5

film cooling:

• wiggle strips
• stacked rings
• machined rings
• zrings

transpiration cooling: channels in multiple layers for air to go through

Question 6

what are the two means of atomization

Answer 6

pressure atomization: veyr high pressure (1.5 times pressure of compressed air)

airblast atomization

Question 7

what are the two types of pressure atomizers

Answer 7

simplex and duplex

duplex can switch off second ring for lower feul usage