what are the technical requirements of the combustor
- 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)
what is the design requirement of the combustor
average reaction time is less than the average residual time
what are the three types of combustors?
pipe, ring, pipe-ring
what are the disadvantages (and advantages)of pipe and ring that lead to mixed
pipe: -homogeneous exit temps
+cheap
ring: -expensive
- must replace all
- lighter
- homogenous temps
mixed: best o both
what are the types of cooling, describe the developments (2 with one broken into 4)
film cooling:
- wiggle strips
- stacked rings
- machined rings
- zrings
transpiration cooling: channels in multiple layers for air to go through
what are the two means of atomization
pressure atomization: veyr high pressure (1.5 times pressure of compressed air)
airblast atomization
what are the two types of pressure atomizers
simplex and duplex
duplex can switch off second ring for lower feul usage
