11-10-2012, 03:08 PM
AXIAL FLOW COMPRESSORS
axial flow compressor.ppt (Size: 6.81 MB / Downloads: 210)
The Progress D-18T ( Lotarev D-18T)
General characteristics
Type: Three-spool high bypass turbofan engine with a single-stage fan.
Fan diameter: 2.33 m (91.73 in)
Dry weight: 4,100 kg (9,039 lb)
Components
Compressor: Seven-stage IP compressor, seven-stage axial HP compressor
Combustors: Annular combustion system
Turbine: Single-stage HP turbine, single-stage IP turbine, four‑stage LP turbine
Performance
Maximum thrust: 229.77 kN
Overall pressure ratio: 27.5
Bypass ratio: 5.7
Turbine inlet temperature: 1,600°K
Thrust-to-weight ratio: Approx 5.7:1
Specifications of An Axial Compressor
There are several different parameters that can specify a particular compressor.
The first set of input parameters are based on the running conditions for the machine.
These involve mass flow, pressure ratio , rotational speed and the number of stages.
Stage degree of reaction : For controlling the distribution of the load between the rotor and the stator.
If this is not of importance, the outlet flow angle for the each stage must be set instead.
Compressible Flow Machines
Owing to compressibility of gas in a compressor
The degree of reaction for equal pressure rise in stator and rotor will be greater than 0.5.
The stage total pressure rise will be higher in order to get equal static pressure rise in stator and rotor.