Handbook of Turbomachinery Second Edition Revised - Ventech!

6
Fundamentals of Compressor Design
INTRODUCTION
Robert O. Bullock*
Allied Signal Company, Phoenix, Arizona, U.S.A.
Compressors raise the pressure of a gas by transferring mechanical energy
from a rotating shaft to the gas. Many ingenious methods have been devised
for this purpose, but the compressors discussed herein are limited to those
that are similar to the axial-flow and centrifugal units illustrated in Figures
1–4. Figure 1 is a cutaway photograph of a TFE 731 turbofan engine
manufactured by the Allied Signal Corporation. Figure 2is adrawing of the
projection of the engine on a plane through the axis of rotation. The fan is a
single-stage axial compressor. A four-stage axial compressor follows, and to
the right is acentrifugal compressor. Figures 3and 4illustrate atwo-stage
centrifugal compressor that is part of the Allied Signal TPE 331 turboprop
engine.
All of these compressors have rows of blades that are mounted on
rotating disks. The blades provide conservative forces that increase the
angular momentum of the gases flowing between them; Euler’s turbine
* Deceased
Copyright © 2003 Marcel Dekker, Inc.