...Hideaki Tamaki; Satoshi Yamaguchi Centrifugal compressors require a wide operating range as well as high efficiency. Typical active control forms to enhance the operating range are suction throttling with a valve in a suction line, discharge throttling with a ring installed in a vaneless diffuser...

...Yingjie Zhang; Xingen Lu; Yanfeng Zhang; Ziqing Zhang; Xu Dong; Ge Han This paper describes the stall mechanism in an ultrahigh-pressure-ratio centrifugal compressor, composed of a double-splitter impeller, radial diffuser, and axial diffuser. A model comprising all impeller and diffuser blade...

.... The method has been applied to both subsonic and transonic centrifugal compressors, where internal flow is complex due to the Coriolis acceleration and the curvature effect. An evaluation of loss decomposition is obtained at various operational conditions. The impact of design modification is also assessed...

...Ruihong Qin; Yaping Ju; Stephen Spence; Chuhua Zhang The advanced design of a centrifugal compressor with high efficiency and wide operating range is a challenging task due to the complex flow field arising from the three-dimensional geometry, especially for the high-speed, highly loaded...

...Rick Dehner; Pranav Sriganesh; Ahmet Selamet; Keith Miazgowicz The present study focuses on the acoustics of a turbocharger centrifugal compressor from a spark-ignition internal combustion engine. Whoosh noise is typically the primary concern for this type of compressor, which is loosely...

...Armin Faßbender; Martin Enneking; Peter Jeschke This article investigates the generation of rotor-alone tones and their contribution to the outflow noise of a transonic centrifugal compressor stage with vaneless diffuser and volute by means of unsteady full-annulus computational fluid dynamics (CFD...

... models use a cubic compressor characteristic that needs to be fitted to experimental data. Therefore, each time a compressor is studied using these models, costly experimental testing is required. In this paper, a new technique for obtaining an axisymmetric centrifugal compressor characteristic...

... the compressor and the turbine are designed via validated (within ±2% pts against experiments) mean-line tools, and the subsequent impact on cycle performance estimates is quantitatively and qualitatively assessed. A significant effort is devoted to the analysis of centrifugal compressors that operate close...

... for the design sensitivity study. Manuscript received November 7, 2017; final manuscript received November 22, 2017; published online April 6, 2018. Editor: Kenneth Hall. 07 11 2017 22 11 2017 Centrifugal compressors Centrifugal pumps Due to attractive characteristics...

...Alexander Hehn; Moritz Mosdzien; Daniel Grates; Peter Jeschke A transonic centrifugal compressor was aerodynamically optimized by means of a numerical optimization process. The objectives were to increase the isentropic efficiency and to reduce the acoustic signature by decreasing the amplitude...

...Jonna Tiainen; Ahti Jaatinen-Värri; Aki Grönman; Teemu Turunen-Saaresti; Jari Backman The estimation of boundary layer losses requires the accurate specification of the freestream velocity, which is not straightforward in centrifugal compressor blade passages. This challenge stems from the jet-wake...

... on a single-stage centrifugal compressor (SSCC). By including slip, which is appropriate considering it is an inviscid effect that should be included in the determination of maximum available diffusion in the impeller, a linear correlation between impeller efficiency and relative diffusion effectiveness...

...Xinqian Zheng; Zhenzhong Sun; Tomoki Kawakubo; Hideaki Tamaki The nonuniformity of the flow field induced by a nonaxisymmetric volute significantly degrades the stability of a turbocharger centrifugal compressor. In this paper, a nonaxisymmetric vaned diffuser is investigated as a nonaxisymmetric...

...Lee Galloway; Stephen Spence; Sung In Kim; Daniel Rusch; Klemens Vogel; René Hunziker The stable operating range of a centrifugal compressor stage of an engine turbocharger is limited at low mass flow rates by aerodynamic instabilities which can lead to the onset of rotating stall or surge...

... in the J OURNAL OF T URBOMACHINERY . Manuscript received September 21, 2017; final manuscript received September 28, 2017; published online October 31, 2017. Editor: Kenneth Hall. 21 09 2017 28 09 2017 Centrifugal compressors Design Centrifugal pumps Turbomachinery blading...

... centrifugal compressors. The factors influencing the presence and extent of this recirculation are numerous, requiring detailed investigations to successfully understand its sources and to characterize its extent. A combination of validated three-dimensional computational fluid dynamics (CFD) data and gas...

... URBOMACHINERY . Manuscript received January 24, 2017; final manuscript received February 22, 2017; published online May 9, 2017. Editor: Kenneth Hall. 24 01 2017 22 02 2017 Centrifugal compressors Fan Turbomachinery blading Compressor Turbine aerodynamic design Centrifugal pumps...

...George A. Christou; Choon S. Tan; Borislav T. Sirakov; Vai-Man Lei; Giuseppe Alescio This paper presents an investigation of the effects of ported shroud (PS) self-recirculating casing treatment used in turbocharger centrifugal compressors for increasing the operable range. The investigation...

... for publication in the J OURNAL OF T URBOMACHINERY . Manuscript received September 7, 2016; final manuscript received December 24, 2016; published online March 15, 2017. Editor: Kenneth Hall. 07 09 2016 24 12 2016 Centrifugal compressors Computational fluid dynamics Fan Impact on cavity...

...Peter Kaluza; Christian Landgraf; Philipp Schwarz; Peter Jeschke; Caitlin Smythe In aero-engine applications, centrifugal compressors are often close-coupled with their respective diffusers to increase efficiency at the expense of a reduced operating range. The aim of this paper is to show...