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Keywords: and operability
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Journal Articles
Article Type: Research Papers
J. Turbomach. May 2023, 145(5): 051010.
Paper No: TURBO-22-1284
Published Online: November 25, 2022
... a centrifugal type with high rational speed, is required to achieve a high-pressure ratio over a wide operating range. To meet this requirement, it is important to secure the compressor stability margin against the surge in the high-speed operating condition. The surge in compressors is a system instability...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2023, 145(5): 051003.
Paper No: TURBO-22-1146
Published Online: November 8, 2022
... is observed as the tip relative Mach number nears unity. Long length-scale modal oscillations can be detected only at the transonic operating condition while spike disturbances are identified as the precursor to instability at subsonic and supersonic tips relative Mach numbers. Finally, the impeller...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2023, 145(5): 051004.
Paper No: TURBO-22-1147
Published Online: November 8, 2022
... by the change in shape and slope of the impeller, inducer, and exducer characteristics. Static pressure characteristics coupled with knowledge of the impeller inlet conditions may be used to explore effective surge suppression techniques, circumvent impeller instability at transonic operating speeds, and extend...
Journal Articles
Article Type: Research Papers
J. Turbomach. March 2023, 145(3): 031015.
Paper No: TURBO-22-1248
Published Online: November 3, 2022
... 09 2022 22 09 2022 03 11 2022 Email: skoley1@jhu.edu Email: asarasw3@jhu.edu 1 Corresponding author. Email: katz@jhu.edu boundary layer development compressor stall surge and operability computational fluid dynamics (CFD) measurement techniques...
Journal Articles
Article Type: Research Papers
J. Turbomach. February 2023, 145(2): 021012.
Paper No: TURBO-20-1233
Published Online: October 20, 2022
...Krishan S. Chana; Robert J. Miller Reaction is the fundamental parameter by which the asymmetry of the velocity triangle of a stage is set. Little is understood about the effect that a reaction has on either the efficiency or the operating range of a compressor. A particular difficulty...
Journal Articles
Article Type: Research Papers
J. Turbomach. September 2022, 144(9): 091015.
Paper No: TURBO-22-1072
Published Online: August 1, 2022
...-annulus, unsteady CFD simulations are used to explain the stall inception mechanisms for the fan at low- and high-speed operating points. A combination of steady and unsteady simulations shows that the fan is predicted to be sensitive to leading edge damage at low-speed, but insensitive at high-speed...
Journal Articles
Article Type: Research Papers
J. Turbomach. September 2022, 144(9): 091007.
Paper No: TURBO-21-1216
Published Online: March 4, 2022
... surge and operability computational fluid dynamics (CFD) turbulence modeling Reynolds stresses axial casing grooves compressor aerodynamic design Glenn Research Center 10.13039/100006193 NNX17AH42A Office of Naval Research 10.13039/100000006 N00014-18-1-2430 Most...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2022, 144(5): 051001.
Paper No: TURBO-21-1183
Published Online: November 15, 2021
...Demetrios Lefas; Robert J. Miller Every supersonic fan or compressor blade row has a streamtube, the “sonic streamtube,” which operates with a blade relative inlet Mach number of one. A key parameter in the design of the “sonic streamtube” is the area ratio between the blade throat area...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2022, 144(4): 041005.
Paper No: TURBO-19-1105
Published Online: November 5, 2021
... 2021 27 09 2021 05 11 2021 compressor stall surge and operability computational fluid dynamics (CFD) fan compressor Fig. 1 Schematic of different uncertainties in a turbomachinery environment: ( a ) tip gap tolerance, ( b ) leading edge tolerance, ( c ) stagger angle...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2022, 144(1): 011009.
Paper No: TURBO-21-1145
Published Online: September 21, 2021
... cavity and leaking flows compressor stall surge and operability computational fluid dynamics (CFD) Imperial College London 10.13039/501100000761 01015425 Compressor tip leakage flow plays a dominant role in determining compressor work input, efficiency, and stability [ 1 ]. Due...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2021, 143(10): 101010.
Paper No: TURBO-21-1015
Published Online: May 17, 2021
... impeller, a splittered vaned radial diffuser (RD), and axial outlet guide vanes (OGVs). The methodology for calculating the performance is detailed, including the consideration of humidity in order to minimize errors related in particular to operating atmospheric conditions. The shift of the surge line...
Journal Articles
Article Type: Research Papers
J. Turbomach. September 2021, 143(9): 091013.
Paper No: TURBO-20-1052
Published Online: May 12, 2021
... results. A saddle region appeared in the energy performance curves of the three tip clearances, and with the decrease of clearance, the head and efficiency of the mixed-flow pump increased to varying degrees, but the critical stall point shifted to the large flowrate, and the stable operating range...
Journal Articles
Article Type: Research Papers
J. Turbomach. September 2021, 143(9): 091010.
Paper No: TURBO-20-1397
Published Online: May 11, 2021
... Institute (IGTI) of ASME for publication in the J ournal of T urbomachinery . 27 11 2020 17 02 2021 18 02 2021 11 05 2021 compressor stall surge and operability fan compressor and turbine aerodynamic design Mitigating surge and rotating stall in axial...
Journal Articles
Article Type: Research Papers
J. Turbomach. August 2021, 143(8): 081008.
Paper No: TURBO-20-1357
Published Online: April 26, 2021
...Toshimasa Miura; Hideaki Yamashita; Ryota Takeuchi; Naoto Sakai Centrifugal compressors employed in the oil and gas industry are operated at high gas pressure conditions and are used in a wide operation range. Accurate prediction of the rotating stall and the destabilizing aerodynamic force is one...
Journal Articles
Article Type: Research Papers
J. Turbomach. June 2021, 143(6): 061006.
Paper No: TURBO-19-1323
Published Online: April 8, 2021
... signals for pulsed suction at 80 Hz in a quiescent flow condition Frequency spectra of pressure signals for pulsed suction at 80 Hz in a quiescent flow condition Unsteady controlling parameters or factors play crucial roles in the effective operation of unsteady flow control methods [ 23 , 24...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2021, 143(7): 071001.
Paper No: TURBO-20-1252
Published Online: April 8, 2021
...–Stokes (URANS) analysis. Total pressure and swirl angle distortion descriptors, as defined by the Society of Automotive Engineers (SAE) S-16 committee, and, total pressure loss into the core engine are described for the core feed flow at different operating conditions and landing speeds. It is observed...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2021, 143(5): 051003.
Paper No: TURBO-20-1396
Published Online: March 31, 2021
... velocity triangle can be designed to improve thrust when coupled to a short intake operating at high AOA. Two AOA values are investigated using unsteady computational fluid dynamics: 20 deg (attached flow) and 35 deg (separated flow). Thrust at high AOA is governed by three key loss and work input...
Journal Articles
Article Type: Research Papers
J. Turbomach. December 2020, 142(12): 121007.
Paper No: TURBO-19-1176
Published Online: November 16, 2020
... number of harmonics. The new method has also been applied to investigate the rotating stall inception of the NASA rotor 67 for distorted inlet flows near stall operating conditions. The method is shown to accurately reproduce the full-annulus solution with a few spatial harmonics, capturing...
Journal Articles
Article Type: Research Papers
J. Turbomach. December 2020, 142(12): 121005.
Paper No: TURBO-20-1002
Published Online: November 9, 2020
...Grzegorz Liśkiewicz; Michał Kulak; Krzysztof Sobczak; Matthew Stickland In this article, a numerical model of the full surge cycle is presented for the low-speed centrifugal blower and compared with the experiment. Surge phenomenon is very dangerous for the compressor operation. Therefore...
Journal Articles
Article Type: Research Papers
J. Turbomach. November 2020, 142(11): 111006.
Paper No: TURBO-19-1212
Published Online: October 15, 2020
.... To assess the aerodynamic stability of fan blades due to distortions, rig tests are usually carried out to establish the loss in stall margin. In such test campaigns, an exit duct (which is followed by a nozzle) is placed downstream of the fan blade, and the operating condition of the fan is controlled...