Calculation of various diffuser flows with inlet swirl and inlet distortion effects

A method of predicting the properties of various turbulent flows in planar, conical, and annular diffusers with inlet swirl and inlet distortion effects has been developed and appraised. The numerical scheme is based on the fully conservative control volume representation of governing conservation equations. The method is capable of carrying out the calculation when the flowfield contains stalled or recirculation flow regions. Three different discretization schemes are compared to analyze the numerical diffusion. An algebraic Reynolds stress model is used to represent the large streamline curvature. The appraisal is achieved by comparing predicted results with various experimental data. The results show that the numerical scheme with the utilized turbulence closure model predicts various diffuser flows with the effects of inlet swirl and inlet distortion within measurement accuracy and is able to provide various guiding information for many engineering applications.

[1]  Joel H. Ferziger,et al.  A Prediction Method for Planar Diffuser Flows , 1981 .

[2]  K. L. So,et al.  Vortex phenomena in a conical diffuser. , 1966 .

[3]  John K. Harvey,et al.  Some observations of the vortex breakdown phenomenon , 1962, Journal of Fluid Mechanics.

[4]  G. de Vahl Davis,et al.  An evaluation of upwind and central difference approximations by a study of recirculating flow , 1976 .

[5]  S. J. Shamroth,et al.  An analysis and application of the time- dependent turbulent boundary-layer equations , 1971 .

[6]  G. D. Raithby,et al.  Skew upstream differencing schemes for problems involving fluid flow , 1976 .

[7]  C. Hah,et al.  Prediction of Two- and Three-Dimensional Asymmetrical Turbulent Wakes, Including Curvature and Rotation Effects , 1980 .

[8]  C. P. Chen,et al.  A New Passive Boundary-Layer Control Device , 1977 .

[9]  Michael A. Leschziner,et al.  Practical evaluation of three finite difference schemes for the computation of steady-state recirculating flows , 1980 .

[10]  Yasutoshi Senoo,et al.  Swirl Flow in Conical Diffusers , 1977 .

[11]  R. W. Fox,et al.  Effects of swirling inlet flow on pressure recovery in conical diffusers , 1971 .

[12]  S. J. Kline,et al.  Optimum Design of Straight-Walled Diffusers , 1959 .

[13]  Carl A. Moore,et al.  Some Effects of Vanes and of Turbulence in Two-Dimensional Wide-Angle Subsonic Diffusers , 1958 .

[14]  J. A. Hoffmann.  Effects of free-stream turbulence on diffuser performance , 1981 .

[15]  D. B. Spalding,et al.  Turbulent shear flows , 1980 .

[16]  Wolfgang Rodi,et al.  Calculation of Annular and Twin Parallel Jets Using Various Discretization Schemes and Turbulence-Model Variations , 1981 .

[17]  G. D. Raithby,et al.  A critical evaluation of upstream differencing applied to problems involving fluid flow , 1976 .