Structural Response of a Single-Stage Centrifugal Compressor to Fluid-Induced Excitations at Low-Flow Operating Condition: Experimental and Numerical Study

Kirill Kabalyk, Andrzej Jaeschke, Grzegorz Liśkiewicz, Michał Kulak, Tomasz Szydłowski and Robert Pietruszewski
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Kirill Kabalyk: Institute of Turbomachinery, Lodz University of Technology, Wólczańska 217/221, 93-005 Łódź, Poland
Andrzej Jaeschke: Institute of Turbomachinery, Lodz University of Technology, Wólczańska 217/221, 93-005 Łódź, Poland
Grzegorz Liśkiewicz: Institute of Turbomachinery, Lodz University of Technology, Wólczańska 217/221, 93-005 Łódź, Poland
Michał Kulak: Institute of Turbomachinery, Lodz University of Technology, Wólczańska 217/221, 93-005 Łódź, Poland
Tomasz Szydłowski: Department of Vehicles and Fundamentals of Machine Design, Lodz University of Technology, Stefanowskiego 1/15, 90-537 Łódź, Poland
Robert Pietruszewski: Department of Vehicles and Fundamentals of Machine Design, Lodz University of Technology, Stefanowskiego 1/15, 90-537 Łódź, Poland

Energies, 2021, vol. 14, issue 14, 1-21

Abstract: The article describes an assessment of possible changes in constant fatigue life of a medium flow-coefficient centrifugal compressor impeller subject to operation at close-to-surge point. Some aspects of duct acoustics are additionally analyzed. The experimental measurements at partial load are presented and are primarily used for validation of unidirectionally coupled fluid-structural numerical model. The model is based on unsteady finite-volume fluid-flow simulations and on finite-element transient structural analysis. The validation is followed by the model implementation to replicate the industry-scale loads with reasonably higher rotational speed and suction pressure. The approach demonstrates satisfactory accuracy in prediction of stage performance and unsteady flow field in vaneless diffuser. The latter is deduced from signal analysis relying on continuous wavelet transformations. On the other hand, it is found that the aerodynamic incidence losses at close-to-surge point are underpredicted. The structural simulation generates considerable amounts of numerical noise, which has to be separated prior to evaluation of fluid-induced dynamic strain. The main source of disturbance is defined as a stationary region of static pressure drop caused by flow contraction at volute tongue and leading to first engine-order excitation in rotating frame of reference. Eventually, it is concluded that the amplitude of excitation is too low to lead to any additional fatigue.

Keywords: centrifugal compressor; fluid-structure interaction; off-design operation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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