Centrifugal Compressor Polytropic Performance—Improved Rapid Calculation Results—Cubic Polynomial Methods

This paper presents a new improved approach to calculation of polytropic performance of centrifugal compressors. This rapid solution technique is based upon a constant efficiency, temperature-entropy polytropic path represented by cubic polynomials. New thermodynamic path slope constraints have been...

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Bibliographic Details
Published in:International journal of turbomachinery, propulsion and power propulsion and power, 2021-06, Vol.6 (2), p.15
Main Authors: Taher, Matt, Evans, Fred
Format: Article
Language:English
Subjects:
Accuracy
Approximation
ASME PTC-10
Centrifugal compressors
compressor performance test
Efficiency
Mathematical functions
Methods
Model accuracy
Numerical analysis
Performance tests
piecewise cubic polynomial approximation
Polynomials
polytropic process
real gas
temperature-entropy
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Summary:This paper presents a new improved approach to calculation of polytropic performance of centrifugal compressors. This rapid solution technique is based upon a constant efficiency, temperature-entropy polytropic path represented by cubic polynomials. New thermodynamic path slope constraints have been developed that yield highly accurate results while requiring fewer computing resources and reducing computing elapsed time. Applying this thermodynamically sound cubic polynomial model would improve accuracy and shorten compressor performance test duration at a vendor’s shop. A broad range of example case results verify the accuracy and ease of use of the method. The example cases confirm the cubic polynomial methods result in lower calculation uncertainty than other methods.
ISSN:2504-186X
2504-186X
DOI:10.3390/ijtpp6020015