Abstract
Computational Fluid Dynamics (CFD) has been extensively used in centrifugal compressor design. CFD provides further optimisation opportunities for the compressor design rather than designing the centrifugal compressor. The experience-based design process still plays an important role for new compressor developments. The wide variety of design subjects represents a very complex design world for centrifugal compressor designers. Therefore, some basic information for centrifugal design is still very important. The impeller is the key part of the centrifugal stage. Designing a highly efficiency impeller with a wide operation range can ensure overall stage design success. This paper provides some empirical information for designing industrial centrifugal compressors with a focus on the impeller. A ported shroud compressor basic design guideline is also discussed for improving the compressor range.
Highlights
New compressor designs always must meet the customers’ needs with the shortest time to market, low cost, and improved performance
Fundamental fluid dynamics theory [37, 38] shows that the flow inside a pipe for a different Reynolds number represents different flow patterns
The tip clearance impacts the overall compressor performance because it increases the magnitude of the secondary flow inside the impeller blades and produces strong tip vortices
Summary
New compressor designs always must meet the customers’ needs with the shortest time to market, low cost, and improved performance. Industrial compressor design expects a state-of-the-art performance compressor without making a second build for less cost and short development time. For achieving this goal, compressor design engineers need to have multidiscipline knowledge of centrifugal compressor design. The new development model requires the compressor designer to design for market, manufacturing, and end users. When the compressor inlet flow is reduced, the compressor experiences an unsteady flow phenomena surge and rotating stall These instabilities can cause noise nuisance and critical operating conditions with strong dynamical loading on the blades. Some design practices for a ported shroud impeller casing [33] are discussed for improving the compressor operational range
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