Axial flow compressors figure

Figure 3-10 shows a similar performance map for an axial-flow compressor. Note the smaller operational flow range for the axial-flow compressor as compared to the centrifugal compressor. Figure 3-11 shows a typical compressor map presented from a slightly different viewpoint. On this map. 

Figure 3-10. Typical flow map for an axial-flow compressor.

The turboprop engine has a power turbine instead of the nozzle as seen in Figure 4-2. The power turbine drives the propeller. The unit shown schematically is a two-shaft unit, this enables the speed of the propeller to be better controlled, as the gasifier turbine can then operate at a nearly constant speed. Similar engines are used in helicopter drive applications and many have axial flow compressors with a last stage as a centrifugal compressor as shown in Figure 1-14. 

As with other types of rotating machinery, an axial compressor can be described by a cylindrical coordinate system. The Z axis is taken as running the length of the compressor shaft, the radius r is measured outward from the shaft, and the angle of rotation 6 is the angle turned by the blades in Figure 7-2. This coordinate system will be used throughout this discussion of axial-flow compressors. 

Figure 7-3. Variation of enthalpy, velocity, and pressure through an axial-flow compressor.

Figure 1. Approximate ranges of application for reciprocating, centrifugal, and axial-flow compressors.

Figure 1-12. Axial-flow compressor. Courtesy ofDemag Delaval Turbamachinety Corp.)...

Figure 6-3. Velocity diagrams for an axial-flow compressor stage.

Figure 6-5. Velocity diagrans for various degrees of reaction in an axial-flow compressor stage. (Reprintad with permission of MaemHIan PublisMng Company from Principles ofTuttomachinery by D. G. Shepherd, Macmiiian Publishing Company, 1956)...

Figure 6-7. Pressure-volume chart for an axial-flow compressor with partial stator vane control. (Courtesy ofA-C Compressor Corporatiori ...

Figures 12-46 illustrates the key styles of wheels for use on the rotating shafts of multistage centrifugal, single-stage compressors and fans, and axial flow compressors (to he discussed later in this chapter). The flow-handling capability of a specific impeller geometry is descrihed hy the flow coefficient, ...

Figure 12-93. Typical geared turbine-driven axial flow compressor unit. (Used by permission Dresser-Rand Company.)...

Figure 3.6. Approximate polytropic efficiencies centrifugal and axial-flow compressors...

Figure 1.1. Schematic of spray combustion process (a) annular combustion chamber in a single spool turbojet with an axial flow compressor (b) fuel injection and droplet formation in combustion chamber.

Figure 10-92 shows a typical axial-flow compressor. The rotating element consists of a single drum to which are attached several rows... 

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