Author: Moududur Rahman
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 258
Book Description
This study is aimed at the development of a computational technique for the prediction of the flow field in wide angle diffusers. The finite element technique is used for the solution of the governing equations. A commercial software package, NISA/3DFlUID, modified for this specific application was used. The parameters affecting the flow field have been identified. For a wide range of variation of these parameters, the effects on the flow field have been examined. This investigation is an exhaustive and comprehensive numerical study of diffuser flows. Such a study will result in substantial improvement in the understanding of the anatomy of the flow field. The creation of the current knowledge base will also enable a judicious selection of diffusers for industrial applications. It was found that for laminar flow through wide angle diffusers the computational technique adequately predicted the qualitative and quantitative behavior of the flow field. Therefore new results, as predicted by the current computational technique have been presented. For example, it was found that the effective recirculation length varies exponentially with the angle of expansion of the diffuser. For turbulent flow the standard k-e model has been found to be qualitatively adequate in representing the flow field. However, the quantitative predictions are being compared with available experimental results and those obtained using other numerical schemes. A wide range of possibilities exist for the constants and boundary conditions employed in k-e modeling. Such a numerical experimentation requires deep understanding of the equations governing the flow field. The validity and/or adjustments of these constants and boundary conditions for diffuser flow are investigated.
Numerical Investigation of Flow Through Wide Angle Diffusers
Author: Moududur Rahman
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 258
Book Description
This study is aimed at the development of a computational technique for the prediction of the flow field in wide angle diffusers. The finite element technique is used for the solution of the governing equations. A commercial software package, NISA/3DFlUID, modified for this specific application was used. The parameters affecting the flow field have been identified. For a wide range of variation of these parameters, the effects on the flow field have been examined. This investigation is an exhaustive and comprehensive numerical study of diffuser flows. Such a study will result in substantial improvement in the understanding of the anatomy of the flow field. The creation of the current knowledge base will also enable a judicious selection of diffusers for industrial applications. It was found that for laminar flow through wide angle diffusers the computational technique adequately predicted the qualitative and quantitative behavior of the flow field. Therefore new results, as predicted by the current computational technique have been presented. For example, it was found that the effective recirculation length varies exponentially with the angle of expansion of the diffuser. For turbulent flow the standard k-e model has been found to be qualitatively adequate in representing the flow field. However, the quantitative predictions are being compared with available experimental results and those obtained using other numerical schemes. A wide range of possibilities exist for the constants and boundary conditions employed in k-e modeling. Such a numerical experimentation requires deep understanding of the equations governing the flow field. The validity and/or adjustments of these constants and boundary conditions for diffuser flow are investigated.
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 258
Book Description
This study is aimed at the development of a computational technique for the prediction of the flow field in wide angle diffusers. The finite element technique is used for the solution of the governing equations. A commercial software package, NISA/3DFlUID, modified for this specific application was used. The parameters affecting the flow field have been identified. For a wide range of variation of these parameters, the effects on the flow field have been examined. This investigation is an exhaustive and comprehensive numerical study of diffuser flows. Such a study will result in substantial improvement in the understanding of the anatomy of the flow field. The creation of the current knowledge base will also enable a judicious selection of diffusers for industrial applications. It was found that for laminar flow through wide angle diffusers the computational technique adequately predicted the qualitative and quantitative behavior of the flow field. Therefore new results, as predicted by the current computational technique have been presented. For example, it was found that the effective recirculation length varies exponentially with the angle of expansion of the diffuser. For turbulent flow the standard k-e model has been found to be qualitatively adequate in representing the flow field. However, the quantitative predictions are being compared with available experimental results and those obtained using other numerical schemes. A wide range of possibilities exist for the constants and boundary conditions employed in k-e modeling. Such a numerical experimentation requires deep understanding of the equations governing the flow field. The validity and/or adjustments of these constants and boundary conditions for diffuser flow are investigated.
An Experimental Investigation of Two Large Annular Diffusers with Swirling and Distorted Inflow
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
Book Description
Experimental and Numerical Investigation of Separated Flow in a Two-dimensional Diffuser
Author: Wisith Jeangprajak
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 176
Book Description
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 176
Book Description
An Experimental Investigation of Two Large Annular Diffusers with Swirling and Distorted Inflow
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 112
Book Description
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 112
Book Description
A Numerical Investigation of Flow in Rotating Radial Diffusers
Author: A. K. Majumdar
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
Some Effects of Vanes and of Turbulance on Two-dimensional Wide-angle Subsonic Diffusers
Author: Carl Anderson Moore (Jr.)
Publisher:
ISBN:
Category : Turbines
Languages : en
Pages : 426
Book Description
Publisher:
ISBN:
Category : Turbines
Languages : en
Pages : 426
Book Description
Numerical Analysis of Turbulent Separated Subsonic Diffuser Flows
Author: J. C. Chien
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 164
Book Description
A general finite difference formulation of the incompressible Navier-Stokes equations in terms of the vorticity and the stream function is presented for turbulent internal flows. Turbulent models such as algebraic eddy viscosity models, and the low Reynolds number two-equation k-epsilon models were systematically studied. Numerical solutions are presented for both separated and non-separated subsonic diffuser flows with either a sublayer coordinate stretching or a low of the wall matching procedure. Excellent agreement with experimental data is obtained for the fully developed channel flow. Agreement with data from an 8-deg conical diffuser is also good. The detailed flow-field structure for separated diffuser flows can be obtained including the prediction of the separation point. (Author).
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 164
Book Description
A general finite difference formulation of the incompressible Navier-Stokes equations in terms of the vorticity and the stream function is presented for turbulent internal flows. Turbulent models such as algebraic eddy viscosity models, and the low Reynolds number two-equation k-epsilon models were systematically studied. Numerical solutions are presented for both separated and non-separated subsonic diffuser flows with either a sublayer coordinate stretching or a low of the wall matching procedure. Excellent agreement with experimental data is obtained for the fully developed channel flow. Agreement with data from an 8-deg conical diffuser is also good. The detailed flow-field structure for separated diffuser flows can be obtained including the prediction of the separation point. (Author).
An Experimental Investigation of the Flow in Wide-angle Screened Diffusers
Author: D. L. Lane
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Investigation of Flow Through an Asymmetric Plane Diffusers
Author: Mohamed Ramadan Gomaa Behiri
Publisher:
ISBN: 9783659936043
Category :
Languages : en
Pages : 148
Book Description
Publisher:
ISBN: 9783659936043
Category :
Languages : en
Pages : 148
Book Description
ASME 67-FE-23
Author: E. Razinsky
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 7
Book Description
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 7
Book Description