... operating points. The top two plots belong to Mic #1 (inlet duct) and the bottom two pictures belong to Mic #9 (far field) at a fixed rotational speed: ( a ) 30 krpm. Mic #1 (inlet duct), ( b ) 30 krpm. Mic #9 (far field), ( c ) 4 krpm. Mic #1 (inlet duct), ( d ) 40 krpm. Mic #9 (far field), ( e ) 50 krpm...

... clearance, a drastic decrease in the static pressure rise coefficient near the surge point was observed. At this operating condition, large, unsteady pressure fluctuation at the blade tip was confirmed, and the occurrence of tip leakage vortex breakdown was clarified by unsteady multipoint pressure...

...-end torque MP = mixing-plane (or “Stage”) interface OEM = original equipment manufacturer OP = operating point PS = pressure side RANS = Reynolds-Averaged Navier–Stokes ref = reference value RP = rated power RS = rotor–stator QUB = Queen’s...

...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...

.... 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...

... compressors and pumps compressor stall surge and operability Turbocharging is an enabling technology to decarbonize the automotive industry and help transition toward a sustainable future. With the target of reducing greenhouse gas emissions, the turbocharger compressor, typically a centrifugal...

... 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...

... throughout the present discussion. Therefore, it is important to understand the differences in the flow field among the different operating regimes. Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the J ournal of T urbomachinery . 13 07 2022 11...

... urbomachinery . 14 08 2022 22 09 2022 22 09 2022 03 11 2022 boundary layer development compressor stall surge and operability computational fluid dynamics (CFD) measurement techniques National Aeronautics and Space Administration 10.13039/100000104 NNX17AH42A...

...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...

... Axial Compressor: Effects of Tip Gap Size on the Tip 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...

...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 A real-world system is seldom deterministic in nature. There is always an element of uncertainty present in the parameters that define the system...

... 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 to the multi-scale nature...

... 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...

... 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...