الفهرس 
Chapter 1: IntroductionOnly 14 pages are availabe for public view
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Abstract
Flow study in centrifugal compressors is the most complicated one in
turbomachinery. The difficulty is mainly due to the unsymmetrical geometry of
blades and volute as well as the presence of secondary flow. The situation becomes
worse in the case of multi-stage centrifugal compressor. The investigation is so
complicated because of the presence of return bends between stages. So, it is a
large domain of study.
Recently, it is common to use a computational solution to simulate the flow
in the compressor. A sector-domain is used to simplify the case study. Few
researchers considered the full domain of a single-stage centrifugal compressor.
The present study concerns the full domain of a four-stage centrifugal compressor.
Both computational and experimental investigations were utilized to study
the flow behavior inside the compressor. Computational study was carried out by
the commercial code ”CFD-RC”. Experimental work was accomplished by the use
of a data acquisition system, advanced sensors and ”Lab View” interface software.
Comparisons between computational and experimental outputs were performed.
The computational code was validated experimentally and numerically.
Compressor map was drawn numerically and experimentally. Surge was unsteadily
simulated. Surge predicted at mass flow rate of 0.0093 kg/s (0.00719 m3/s nominal
flow rate) at 12,000 rpm. Uncertainty was studied for experimental results. Full-
domain solution is efficient. Using the parallel computational technology, ”HPC”
program, is recommended for future work.