Author: Sylvain Friedlich
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 110
Book Description
Performance Characteristics of Plane Wall Diffuser and Some New Concepts of Diffuser Flow Mechanisms
Author: Sylvain Friedlich
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 110
Book Description
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 110
Book Description
Performance Characteristics of Plane-wall Two-dimensional Diffusers
Author: Elliott G. Reid
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 90
Book Description
Experiments have been made at Stanford University to determine the performance characteristics of plane-wall, two-dimensional diffusers which were so proportioned as to insure reasonable approximation of two-dimensional flow.
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 90
Book Description
Experiments have been made at Stanford University to determine the performance characteristics of plane-wall, two-dimensional diffusers which were so proportioned as to insure reasonable approximation of two-dimensional flow.
Journal of Basic Engineering
Author:
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 892
Book Description
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 892
Book Description
Turbomachinery Diffuser Design Technology
Author: David Japikse
Publisher: Concepts Eti
ISBN:
Category : Science
Languages : en
Pages : 312
Book Description
Publisher: Concepts Eti
ISBN:
Category : Science
Languages : en
Pages : 312
Book Description
Performance Characteristics of Two 6© and Two 12© Diffusers at High Flow Rates
Author: William J. Nelson
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 32
Book Description
Characterization of Performance-limiting Flow Mechanisms in a Centrifugal Compressor Stage
Author: David W. Erickson (S.M.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
Book Description
This research characterizes the performance of a centrifugal compressor stage with a special focus on the pipe diffuser. Two diffuser configurations are studied, one of which is a truncated version of the other. Experimental data acquired on a research compressor stage is interrogated along with a set of well-designed Reynolds-Averaged Navier Stokes computations, complemented by reduced order flow modeling. The fundamental performance-limiting flow mechanisms in the diffuser are identified and used to physically relate important geometry features and operating conditions to the observed compressor pressure rise, efficiency, and operability characteristics. Despite large differences in their geometry, the two diffuser configurations exhibit similar pressure recovery characteristics due to differences in exit nonuniformity and flow angle which result in similar effective area ratios. Variations in the diffuser pressure recovery coefficient with operating point are found to be most influenced by the diffuser inlet flow angle, and secondly by the inlet Mach number. The diffuser inlet flow angle has the primary effect of setting the diffuser inlet one-dimensional area ratio, increasing diffusion at high flow angles. In addition, the diffuser incidence angle influences the formation of counter-rotating vortex pairs that persist throughout the diffuser passage. Using a two-dimensional integral boundary layer model that is modified to accommodate three-dimensional effects as source terms, these secondary flows are shown to detrimentally impact the diffuser pressure rise capability by accumulating high loss flow along the diffuser wall near the plane of symmetry between the vortices. This contributes to the extent and location of a large diffuser passage separation, especially for the baseline diffuser. The impact of the vortices on the boundary layer growth rate is shown to scale inversely with diffuser aspect ratio. The major performance difference between the two diffuser configurations is that the truncated diffuser configuration experiences enhanced stall margin over the baseline diffuser at the design speed. These differences are traced to reduced secondary flows influence and thus reduced separation extent for the higher aspect ratio truncated diffuser. It is hypothesized that the onset of stall for the baseline diffuser configuration is initiated by the transition of the vortex location and corresponding passage separation between diffuser pressure and suction sides with increasing cusp incidence. Conversely, because the extent of the passage separation in the truncated diffuser is diminished due to the higher aspect ratio, the switch in separation side does not immediately initiate instability. The fact that secondary flows have a large influence on diffuser pressure rise capability and compressor stability is counter to conventional preliminary diffuser design approaches which neglect such 3D effects. The findings of this research may therefore be considered during preliminary design optimization to produce better-performing diffuser designs.
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
Book Description
This research characterizes the performance of a centrifugal compressor stage with a special focus on the pipe diffuser. Two diffuser configurations are studied, one of which is a truncated version of the other. Experimental data acquired on a research compressor stage is interrogated along with a set of well-designed Reynolds-Averaged Navier Stokes computations, complemented by reduced order flow modeling. The fundamental performance-limiting flow mechanisms in the diffuser are identified and used to physically relate important geometry features and operating conditions to the observed compressor pressure rise, efficiency, and operability characteristics. Despite large differences in their geometry, the two diffuser configurations exhibit similar pressure recovery characteristics due to differences in exit nonuniformity and flow angle which result in similar effective area ratios. Variations in the diffuser pressure recovery coefficient with operating point are found to be most influenced by the diffuser inlet flow angle, and secondly by the inlet Mach number. The diffuser inlet flow angle has the primary effect of setting the diffuser inlet one-dimensional area ratio, increasing diffusion at high flow angles. In addition, the diffuser incidence angle influences the formation of counter-rotating vortex pairs that persist throughout the diffuser passage. Using a two-dimensional integral boundary layer model that is modified to accommodate three-dimensional effects as source terms, these secondary flows are shown to detrimentally impact the diffuser pressure rise capability by accumulating high loss flow along the diffuser wall near the plane of symmetry between the vortices. This contributes to the extent and location of a large diffuser passage separation, especially for the baseline diffuser. The impact of the vortices on the boundary layer growth rate is shown to scale inversely with diffuser aspect ratio. The major performance difference between the two diffuser configurations is that the truncated diffuser configuration experiences enhanced stall margin over the baseline diffuser at the design speed. These differences are traced to reduced secondary flows influence and thus reduced separation extent for the higher aspect ratio truncated diffuser. It is hypothesized that the onset of stall for the baseline diffuser configuration is initiated by the transition of the vortex location and corresponding passage separation between diffuser pressure and suction sides with increasing cusp incidence. Conversely, because the extent of the passage separation in the truncated diffuser is diminished due to the higher aspect ratio, the switch in separation side does not immediately initiate instability. The fact that secondary flows have a large influence on diffuser pressure rise capability and compressor stability is counter to conventional preliminary diffuser design approaches which neglect such 3D effects. The findings of this research may therefore be considered during preliminary design optimization to produce better-performing diffuser designs.
Advanced Centrifugal Compressors
Author: American Society of Mechanical Engineers. Turbomachinery Committee
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 236
Book Description
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 236
Book Description
Master's Theses and Doctoral Dissertations in the Pure and Applied Sciences
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 454
Book Description
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 454
Book Description
Plane-wall Diffuser Flow
Author: Ivar G. Jonsson
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 171
Book Description
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 171
Book Description
Applied Mechanics Reviews
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 622
Book Description
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 622
Book Description