... fluid forces. 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, the investigation of flow...

... numerical analysis pumps rotational flow turbomachinery Unsteady flow in both axial and centrifugal turbomachines has become a major research topic in the last decades. A wide number of numerical and experimental studies have been carried out to address the time-averaged contribution...

... rotational flow turbomachinery wavelet transforms flow instability rotating stall static inflow distortion dynamic inflow distortion stall inception Stable compressor operation during its maximum performance is of primary significance to gas turbine designers. However, the presence...

... 2010 23 09 2010 23 09 2010 aerodynamics blades computational fluid dynamics flow separation impact (mechanical) impellers jets pipe flow turbomachinery vortices The single-impeller design calculation covers one single-blade passage. The gridding system used is shown...

...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...

... length fluid force cavitation thermodynamics turbomachinery 2009 American Society of Mechanical Engineers ...

... . Laskminarayana , B. , 1996 , Fluid Dynamics and Heat Transfer of Turbomachinery , Wiley , New York . Shi , F. , and Tsukamoto , H. , 2001 , “ Numerical Study of Pressure Fluctuations Caused by Impeller-Diffuser Interaction in a Diffuser Pump Stage ,” ASME J. Fluids Eng. 0098-2202 , 123...

... to the suction side. Comparison of predictions and L2F measurements for the relative velocity at the rotor outlet (Operating Point P1). Computational results obtained on Grid B. Color scale given in m/s. compressors extrapolation rotational flow turbomachinery turbulence viscosity Flows...

...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...

.... , 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 , D. , Mittal , R. , Wang , M. , and Moin , P. , 2006 , “ Analysis of Stability...

... coefficient, showing a particular tendency to develop at flow coefficients below the design value. 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...

... to achieve quantitative agreement with measured results, and give new findings to the complicated three-dimensional structure of the backflow, which was very limited under experimental studies. 25 08 2005 28 09 2006 flow simulation vortices turbomachinery pumps flow instability Navier...

... by installing J-Grooves. 19 09 2005 03 07 2006 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...

... 2006 cavitation blades rocket engines turbomachinery pumps finite volume methods flow instability A similar configuration is obtained for a cavitation number equal to 0.6 (i.e., the inferior limit value). The sheets of cavitation are much more developed and responsible...

...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...

... torque flow instability rotational flow blades turbomachinery impellers Turbomachinery represents a mature advanced technology. Design techniques continually strive to improve machinery performance by increasing efficiency and power concentration without sacrificing reliability 1 2...

... 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...