...Hanting Gao; Xu Dong; Ruize Xu; Lei Gao; Dakun Sun; Xiaofeng Sun A clear understanding of the turbomachinery wake flow field is one of the key problems in developing turbomachinery aerodynamics. The theoretical model of helical vortices is established in cylindrical coordinates ( r , θ , z...

... 2011 16 08 2011 16 08 2011 computational fluid dynamics confined flow flow instability flow simulation flow visualisation fluctuations Fourier analysis numerical analysis pumps rotational flow turbomachinery vibrations Due to its huge impact in turbomachinery design...

... ,” ASME J. Turbomach. 0889-504X , 114 , pp. 304 – 311 . 10.1115/1.2929144 Adamczyk , J. J. , 2000 , “ Aerodynamic Analysis of Multistage Turbomachinery Flows in Support of Aerodynamic Design ,” ASME J. Turbomach. 0889-504X , 122 , pp. 189 – 217 . 10.1115/1.555439 Sinha , M...

... distortion as compared with counter-rotating inflow distortion. aerodynamics blades compressors fans flow measurement rotational flow turbomachinery wavelet transforms flow instability rotating stall static inflow distortion dynamic inflow distortion stall inception Stable...

... 2010 23 09 2010 23 09 2010 aerodynamics blades computational fluid dynamics flow separation impact (mechanical) impellers jets pipe flow turbomachinery vortices For centrifugal turbomachinery, a gap exists between the nonrotating inlet duct and the rotating impeller...

...Yoshiki Yoshida; Masato Eguchi; Taiichi Motomura; Masaharu Uchiumi; Hirotaka Kure; Yoshiyulki Maruta Asymmetric cavitation, in which cavity lengths are unequal on each blade, is known as a source of cavitation induced shaft vibration in turbomachinery. To investigate the relationship of the uneven...

... of the cavity length through the thermodynamic effect. 14 04 2008 21 06 2009 18 08 2009 cavitation thermodynamics turbomachinery thermodynamic effect cavitating inducer rotating cavitation cavity length fluid force In rocket engines, the turbopump inducer, which...

... flow rate and pressure rise according to 1 φ = Q π D 2 B U 2 2 ψ = g H U 2 2 / 2 where the subscript 2 refers to the pump outlet section. As can be observed, the expected trend using the Euler turbomachinery formula for centrifugal machines...

... effects in basic configurations motivate a detailed analysis in radial turbomachinery configurations. Given the defects of many existing RC corrections for classical turbulence models, we have implemented two recent corrected models that are sound from both a mathematical and a physical point of view...

...Antoine Dazin; Guy Caignaert; Gérard Bois A theoretical analysis of the fast transients of turbomachineries, based on the study of unsteady and incompressible fluids mechanics equations applied to an impeller, is proposed. It leads to internal torque, internal power, and impeller head...

...G. A. Gerolymos; I. Vallet The purpose of this paper is to present a numerical methodology for the computation of complex 3D turbomachinery flows using advanced multiequation turbulence closures, including full seven-equation Reynolds-stress transport models. The flow equations are discretized...

... ( 1 ), pp. 35 – 60 . You , D. , Moin , P. , Wang , M. , and Mittal , R. , 2004 , “ Study of Tip Clearance Flow in a Turbomachinery Cascade Using Large Eddy Simulation ,” Report TF-86, Department of Mechanical Engineering, Stanford University, Stanford, California. You...

...-Cavitating Flow ,” NASA TN D-6556. 28 08 2006 21 12 2006 cavitation pumps turbomachinery rotational flow flow instability Ever since the recognition of the POGO instability of liquid-propelled rockets more than 40 years ago ( 1 2 ), much attention has been directed...

... Circulation Experiments With Primitive Equations ,” Mon. Weather Rev. 0027-0644 , 91 , pp. 99 – 164 . Kato , C. , Kaiho , M. , and Manabe , A. , 2003 , “ An Overset Finite-Element Large-Eddy Simulation Method With Applications to Turbomachinery and Aeroacoustics ,” ASME J. Appl. Mech...

...-Grooves. cavitation turbomachinery pumps impellers blades cavitation inducer turbopump J-Groove suction performance Cavitation occurring in turbomachinery is a problem to users and designers. Therefore, a good amount of research has been conducted to overcome or suppress...

... cavitation blades rocket engines turbomachinery pumps finite volume methods flow instability To achieve operation at high rotational speed and low inlet pressure, rocket engine turbopumps are generally equipped with an axial inducer stage. Under such operating conditions, cavitation develops...

...Domenico Borello; Kemal Hanjalic; Franco Rispoli We report on the performances of two second-moment turbulence closures in predicting turbulence and laminar-to-turbulent transition in turbomachinery flows. The first model considered is the one by Hanjalic and Jakirlic (HJ) [Comput. Fluids, 27(2...

...Guoyi Peng A practical combined computation method of the circumferentially averaged mean through-flow is presented for 3D inverse computations of hydraulic turbomachinery blades to consider the influence of interrelated hydraulic components. A comprehensive computation domain including the runner...

... these terms in turbomachinery design to obtain reduced impeller moment fluctuations in high power concentration applications for greater machine reliability. The most obvious way to manipulate these terms is by increasing the radial gap size but other methods such a decreasing the blade loading or reducing...

... as a variable of great significance in the analysis of turbomachinery, there seem to be a misconception regarding its concept and application. Indeed, empirical correlations have been widely used to estimate the slip factor, even in the case of two-phase flow applications, where it has not been investigated...