Compressor Performance: Aerodynamics for the User by Theodore Gresh

By Theodore Gresh

This booklet could be favored as a convenient reference booklet by means of compressor layout engineers and compressor upkeep engineers in addition to engineering scholars. As its name indicates, this booklet covers the entire spectrum of data wanted for anyone to choose, function, attempt and preserve axial or centrifugal compressors. It contains a few simple aerodynamic concept to supply the person with the "how's" and "why's" of compressor layout. upkeep Engineers specially will delight in the troubleshooting guidance provided. the various instance difficulties and the reference information equivalent to gasoline homes and circulate meter calculations will let effortless research of compressor functionality in perform. a working laptop or computer application is additionally provided for you to improve the price of the publication and the years of workmanship and event therein.M. Theodore Gresh has been with the Elliot corporation in Jeannette, Pennsylvania, in view that 1975, at first engaged on the mechanical and aerodynamic layout and alertness of centrifugal compressors.

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Effects on rotor dynamics and impeller stress? PRESSURE CAPACITY The primary factor in considering the capacity limit is whether the nozzles will pass the required flow at a reasonable pressure drop. A good rule of thumb for inlet nozzles for air or light gas is 140 fps. 01 (See Figure 6 . 1 7 ) where PI VI2 2 gZI RTI This should be calculated using the area schedule at the inlet flange. For discharge nozzles, velocities can be about 35% higher. The discharge volute can also be the limiting factor.

In a 50% reaction stage, an equal amount of diffusion---or pressure rise--takes place across the rotating and stationary blades. 23). 20 it can be seen that a low angle of attack (low flow) results in high drag (low efficiency) and a low coefficient of lift (low head). As with the centrifugal compressor, the positive-sloped portion of the curve is unusable since this area of operation gives an unstable system and reverse flow occurs. Surge is especially damaging to an axial compressor because of the relatively large mass flow rate of gas and relatively thin blades.

14. On'ta0'ei surge 9 '" HORSEPOWER/DISCHARGE PRESSURE This curve is the most directly usable curve. As long as inlet conditions are matched to the curve, the curve can be read directly without any calculations. 3). Overload . . . range ,n -! ,. 11111%~~~~ es Pressure ratio and efficiency plotted vs. inlet flow is probably the most useful curve for quickly "ballparking" compressor performance, since inlet pressure is a variable. 4). 4b). i 110o/o NOMOGRAPH PLOTS Design Nomographs have been a long-time favorite tool of the engineer to save time making tedious calculations.

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