Session: 40-04 Centrifugal Compressors 2
Paper Number: 82108
82108 - Impact of Operating Conditions on Rotor/Stator Interaction of a High-Pressure Ratio Centrifugal Compressor
The current design trend of centrifugal compressors is aimed at obtaining compact machines with high pressure ratios and performance. This leads to high circumferential speeds and lighter components, thus increasing static stresses and dynamic forcing due to rotor/stator interactions. Therefore, the aeromechanical characterization of these machines is a fundamental step of the design chain. This paper presents an in-depth aeromechanical study of a high-pressure ratio centrifugal compressor using CFD. Firstly, the computational setup is validated against the experimental data; then, the same numerical setup is used to characterize the aeromechanical interactions between the impeller and the up-\downstream static components. The URANS simulations are carried out at three different operating points (near stall, design, near choke), and the unsteady flow field is time and space decomposed showing higher forcing functions at near stall and near choke conditions with respect to the design point, as confirmed by the experimental acquisitions. The presented results highlight the importance of extending the aeromechanical evaluations to different operating points in order to avoid unexpected vibration responses when operating at off-design conditions. Finally, by virtue of an acoustic post-processing techniques, the unsteady pressure coupling in the inter-row region is analyzed to discern the main sources of the overall unsteady interaction.
Presenting Author: Fabrizio Lottini University of Florence
Presenting Author Biography: Fabrizio Lottini is a Ph.D student at the University of Florence
Authors:
Fabrizio Lottini University of FlorenceAndrea Agnolucci University of Florence
Lorenzo Pinelli University of Florence
Lorenzo Toni Baker Hughes
Alberto Guglielmo Baker Hughes
Angelo Grimaldi Baker Hughes
Roberto Pacciani University of Florence
Impact of Operating Conditions on Rotor/Stator Interaction of a High-Pressure Ratio Centrifugal Compressor
Paper Type
Technical Paper Publication