...-corrected mass flowrate EXP = experiment(al) HA = high aspect ratio LA = low aspect ratio LET = low-end torque MP = mixing-plane (or “Stage”) interface OEM = original equipment manufacturer OP = operating point PS = pressure side RANS = Reynolds-Averaged...

.... The results indicated an increase in rotor pressure ratio at all operating conditions with the application of the casing treatment. The stall margin also increased at all rotor speeds. Efficiency increases were observed with the casing treatment at design conditions and some off-design conditions. Numerical...

...Ayush Saraswat; Subhra Shankha Koley; Joseph Katz Stereo particle image velocimetry (SPIV) measurements in a series of axial planes investigate the impact of operating conditions and semicircular axial casing grooves (ACGs) on the evolution of flow structure across multiple blade rows in an axial...

... 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...

... 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...

... 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...

... 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...

...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...

...-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...

... Clearance Flow Structure at Near Stall Operation ,” Proceedings of ASME Turbo Expo: Power for Land, Sea, and Air , Dusseldorf, Germany , June 16–20 , p. V02DT44A040. [14] Denton , J. D. , 2010 , “ Some Limitations of Turbomachinery CFD ,” Proceedings of ASME Turbo Expo: Power for Land, Sea...

...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...

... 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...

... 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...

... 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...

... 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...

... 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...

...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...

...–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...

... 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...

... 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...