Performance prediction of endwall treated fan rotors with inflow distortion

The overall objective of this study was to develop a 3-D numerical analysis for compressor endwall treatment flowfields and to perform a series of detailed numerical predictions to assess the effectiveness of endwall treatments for enhancing the efficiency and stall margin of modern high speed fan rotors. Particular attention was given to examining the effectiveness of endwall treatments to counter the undesirable effects of inflow distortion. The motivation behind this study was the relative lack of physical understanding of the mechanics associated with the effects of endwall treatments and the availability of detailed CFD codes which might be utilized to gain a better understanding of these flows. Calculations were performed using a cylindrical coordinate system utilizing three different gridding techniques based on the type of casing treatment being tested and the level of complexity desired in the analysis. In each case, the casing treatment itself is modeled as a discrete object in the overall analysis, and the flow through the casing treatment is determined as part of the solution. A series of calculations was performed for both treated and untreated modern fan rotors both with and without inflow distortion. The effectiveness of the various treatments was quantified, and several physical mechanisms by which the effectiveness of endwall treatments is achieved are discussed. (Author)

[1]  Andrea Arnone,et al.  Investigation of advanced counterrotation blade configuration concepts for high speed turboprop systems. Task 5: Unsteady counterrotation ducted propfan analysis. Computer program user's manual , 1993 .

[2]  H. Lomax,et al.  Thin-layer approximation and algebraic model for separated turbulent flows , 1978 .

[3]  N. A. Cumpsty,et al.  Flow Phenomena in Compressor Casing Treatment , 1984 .

[4]  Rodrick V. Chima,et al.  An unconditionally stable Runge-Kutta method for unsteady flows , 1989 .

[5]  W. N. Dawes,et al.  A Comparison of the Measured and Predicted Flow Field in a Modern Fan-Bypass Configuration , 1993 .

[6]  H. D. Joslyn,et al.  A Fundamental Criterion for the Application of Rotor Casing Treatment , 1979 .

[7]  Edward M. Greitzer.  Flow instabilities in turbomachines , 1985 .

[8]  G. Kovich,et al.  Effect of casing treatment on overall and blade element performance of a compressor rotor , 1971 .

[9]  Edward M. Greitzer,et al.  Effects of Endwall Suction and Blowing on Compressor Stability Enhancement , 1990 .

[10]  Edward J. Hall,et al.  Investigation of advanced counterrotation blade configuration concepts for high speed turboprop systems. Task 2: Unsteady ducted propfan analysis computer program users manual , 1991 .

[11]  E. Greitzer,et al.  A Method for Assessing Effects of Circumferential Flow Distortion on Compressor Stability , 1987 .

[12]  Susumu Murata,et al.  The Performance Characteristic of an Air-separator of an Axial Flow Fan , 1985 .

[13]  Hiroyuki Takata,et al.  A Study on Configurations of Casing Treatment for Axial Flow Compressors , 1984 .

[14]  Edward M. Greitzer,et al.  Numerical simulation of compressor endwall and casing treatment flow phenomena , 1992 .

[15]  A. Jameson,et al.  Numerical solution of the Euler equations by finite volume methods using Runge Kutta time stepping schemes , 1981 .

[16]  D. C. Wisler,et al.  A Study of Casing Treatment Stall Margin Improvement Phenomena , 1975 .

[17]  R. S. Mazzawy,et al.  Multiple Segment Parallel Compressor Model for Circumferential Flow Distortion , 1977 .

[18]  John J. Adamczyk,et al.  Simulation of three-dimensional viscous flow within a multistage turbine , 1990 .

[19]  R. J. Blade,et al.  Analytical study of effect of casing treatment on performance of a multistage compressor , 1972 .

[20]  Angela Quealy,et al.  Portable programming on parallel/networked computers using the Application Portable Parallel Library (APPL) , 1993 .

[21]  Edward M. Greitzer,et al.  Effects of Slotted Hub and Casing Treatments on Compressor Endwall Flow Fields , 1986 .

[22]  Edward M. Greitzer,et al.  Effects of compressor hub treatment on stator stall margin and performance , 1983 .

[23]  Edward M. Greitzer,et al.  The Role of Tip Clearance in High-Speed Fan Stall , 1991 .

[24]  Robert A. Delaney,et al.  Investigation of advanced counterrotation blade configuration concepts for high speed turboprop systems. Task 3: Advanced fan section grid generator final report and computer program user's manual , 1991 .

[25]  R. L. Elder,et al.  Application of recess vaned casing treatment to axial flow fans , 1990 .

[26]  Tom Hynes,et al.  Calculations of inlet distortion induced compressor flowfield instability , 1989 .

[27]  H. Takata,et al.  Stall Margin Improvement by Casing Treatment—Its Mechanism and Effectiveness , 1977 .

[28]  Meng-Sing Liou,et al.  Multigrid Time-Accurate Integrations of Navier-Stokes Equations , 1993 .

[29]  Edward J. Hall,et al.  Aerodynamic analysis of compressor casing treatment with a 3-D Navier-Stokes solver , 1994 .

[30]  William N. Dawes,et al.  A Comparison of the Measured and Predicted Flowfield in a Modern Fan-Bypass Configuration , 1992 .

[31]  E. M. Greitzer,et al.  Effects of compressor hub treatment on stator stall and pressure rise , 1984 .

[32]  Edward J. Hall,et al.  Investigation of Advanced Counterrotation Blade Configuration Concepts for High Speed Turboprop Systems. Task 8: Cooling Flow/heat Transfer Analysis User's Manual , 1994 .