...Laura McLaughlin; Stephen Spence; Daniel Rusch; Charles Stuart; Marco Geron; Kwok Kai So; Magnus Fischer Often, an improvement in performance at one operating point in a compressor/turbine operating map will lead to a reduction in performance at another area. For example, improving the efficiency...

... operating points close to compressor stall or off-design operating points in steam turbines. In the present work, it is shown that such instabilities do not depend on the blading but also occur in blading-free flow channels. The theoretical proof is carried out with the tools and computational programs...

..., do not necessarily or distinctly occur in every compressor and usually last for a long period without posing serious threats to stable operation. The present study aims at numerically characterizing prestall disturbances in detail in a compressor stage in which they have been experimentally observed...

... over the construction and operation of a rig, which for the first time allows for accurate measurement of water extraction and rapid testing of a variety of bleed slot geometries. Using this test rig, it was found that the use of a bleed slot behind the rotor increases water extraction by up to 40...

... 2023 17 11 2023 15 12 2023 centrifugal compressors and pumps compressor stall surge and operability computational fluid dynamics (CFD) Centrifugal compressors are used in various applications, such as aircraft engines and turbochargers for automobiles. However, when...

...Xiawen Zhang; Yaping Ju; Zhen Li; Feng Liu; Chuhua Zhang High efficiency and wide stability at variable speeds are equally important to the design and operation of multistage axial flow compressors. However, published research works on three-dimensional design optimization of compressors are so far...

... will be called “aerodynamically balanced.” The new design method converges in a few iterations and is physically intuitive because it accounts for the real changes in the 3D area ratio that directly controls the shock structure. Specifically, changes in both the spanwise 3D flow and the rotor’s operating...

... 05 02 2022 01 08 2023 01 08 2023 19 10 2023 compressor stall surge and operability computational fluid dynamics (CFD) fluid dynamics and heat transfer phenomena in compressor and turbine components of gas turbine engines Rolls-Royce 10.13039/501100000767...

... rotating stall centrifugal compressors and pumps compressor stall surge and operability It is common to observe that centrifugal compressor pressure rise characteristic has a sudden pressure loss. It causes a slope change of the characteristic, rolling over from “−”ve to “+”ve at high-speed...

... compressor stall surge and operability National Natural Science Foundation of China 10.13039/501100001809 52006217 51736001 Surge is a compression system instability that appears at low mass flowrate conditions and may cause severe damage to a compressor or mechanical failure...

... 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...

... (IGTI) of ASME for publication in the J ournal of T urbomachinery . 15 11 2022 12 01 2023 12 01 2023 10 02 2023 cavity and leaking flows centrifugal compressors and pumps compressor stall surge and operability computational fluid dynamics (CFD) impact on cavity...

...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...

... urbomachinery . 12 09 2022 14 10 2022 18 10 2022 25 11 2022 compressor surge rotating stall centrifugal compressors and pumps compressor stall surge and operability Turbocharging is an enabling technology to decarbonize the automotive industry and help transition...

... 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...

... component centrifugal compressors and pumps compressor stall surge and operability As reported in Part I of the paper, the compressor surge signature varies as impeller inlet tip flow changes from subsonic to supersonic conditions. At subsonic and supersonic impeller inlet tip conditions...

... Axial Compressor: Effects of Tip Gap Size on the Tip Clearance Flow Structure at Near Stall Operation ,” Proceedings oProceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 2D: Turbomachinery , Dusseldorf, Germany , June 16–20 , Vol. 45639, p. V02DT44A040...

...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...