Computational studies of unsteady flows in a centrifugal compressor stage

Koumoutsos, A. K.; Tourlidakis, A.; Elder, R. L.

doi:10.1243/0957650001538146

Cited by 16 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With further reduction up case (4) in the cavitation parameter, the tip-vortex cavitation has been more produced; the generated pump head still remains, however, constant without severe performance degradation. When the net positive suction head (NPSH) reaches a sufficiently low value over the 'knee' of nearly constant head coefficient (for cases (5) and (6)), the distortion of the flow pattern, by mixing more tip-vortex cavitation with the main flow between the impeller blades, extends across the flow channel and consequently leads to a sudden decrease in the total pressure rise. Comparing with the computational results, it is observed that the cavitating region is spread out over the suction surface as well as the leading edge of the impeller blade.…”

Section: Cavitation Performance Characteristicsmentioning

confidence: 99%

“…This article focuses on the hydraulically detailed performance analysis, including the cavitation phenomena, of a mixed-flow pump for marine waterjet propulsion. Thus, the present study has employed the well-established commercial computational fluid dynamics (CFD) codes [3,4], whose predictive capabilities have already been validated in the open literature and a variety of industrial applications: unsteady flow computation in a centrifugal compressor [5], CFD application to internal flow analysis of a waterjet pump [6], design and performance analysis of a centrifugal blood pump [7], and hydraulic performance analysis of axial-flow pump [8] and radial-inflow turbine [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrodynamically detailed performance analysis of a mixed-flow waterjet pump using computational fluid dynamics

Yoon

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The hydrodynamic design optimization and performance analysis of a mixed-flow waterjet pump have been achieved using the validated commercial computational fluid dynamics (CFD) code. The detailed flow field in the waterjet pump is investigated by the CFD code adopted in the present study. Predicted characteristic curves, including the cavitation performance, agree very well with the test data for a designed mixed-flow waterjet pump over the entire operating conditions. A hydraulically detailed performance analysis with a net positive suction head can be used efficiently as a tool for the practical design optimization and assist in the understanding of the operational characteristics of general purpose mixed-flow pumps.

show abstract

Section: Cavitation Performance Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrodynamically detailed performance analysis of a mixed-flow waterjet pump using computational fluid dynamics

Yoon

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Using the 3D CFD viscous code TASCFlow, they were able to simulate the gasdynamic process of the whole centrifugal compressor stage (impeller, diffuser, and volute) and obtain results that accurately matched the experimental ones. The same commercial code was used by Koumoutsos and his team in the study of unsteady flows in centrifugal compressors [3]. Their conclusions suggest that even though the unsteady simulation is much more accurate and captures better the phenomena inside the centrifugal compressor stage, a steady solution will provide results accurate enough to be used as valid predictions in the design process.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Blade Geometry Generation Techniques for Centrifugal Compressors

Iancu

Trevino

Sommer

2007

International Journal of Rotating Machinery

View full text Add to dashboard Cite

It is a known fact that machined impellers result in improved compressor performance compared to cast impellers of the same design. The performance improvements can be attributed to better surface finish, more accurate geometric definition (tighter dimensional tolerances), well-defined edges, and the lack of blade tip fillet on shrouded impellers. In addition, it has been observed through experimental investigations that the construction method of the impellers has an impact on performance. This paper presents computational fluid dynamic investigations of two types of impellers, with blade surfaces generated using straightline elements (SLEs) and CAD arbitrary definitions. Because there are many different mathematical definitions that CAD tools employ for curves, the resulting arbitrary blade surface is not unique. The numerical results will help understand the causes of the performance differences as well as the effects of SLE blades on the flow through the impeller. Input conditions for computational dynamic simulations are based on experimental results. All references to experimental data in the present paper are for cast impellers. Therefore, the differences in performance are attributed to blade definition (SLE versus other) and not to differences resulting from manufacturing methods.

show abstract

“…Figure 2 shows an impeller model with four vanes used in the test pump of the present work for the trial run. Over the recent years, several researchers [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have taken much effort to develop hydroturbomachines for performance enhancement through the study of different configurations of several hypothetical flow analyses. From the literature review and general insights acquired by the in-depth study of pump impeller, the most influencing design variables are impeller width, impeller eye diameter, number of vanes, and vane outlet angle for enhancing pump performance [26].…”

Section: Test Pump With Impellermentioning

confidence: 99%

Optimizing impeller geometry for performance enhancement of a centrifugal pump using the Taguchi quality concept

Nataraj¹,

Arunachalam²

2006

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

This article discusses a research methodology for performance enhancement of centrifugal pump through Taguchi's parametric design concept. The objective is to find an optimum impeller design and geometry that makes the pump functionally reliable for winning customer's confidence. Computational fluid dynamic (CFD) analysis has been done to know how the flow pattern changes in the impeller when the pump is required to run at different operating conditions. The streamline analysis from CFD plots gives informative pictures of the flow field, which help the designer understand how the effect of deviation made in the impeller design specifications significantly influence the pump performance. CFD results match well with the predictions of the pump performance at the duty point as regard to head, discharge, and efficiency of the prototype model. The study infers that the CFD prediction tallies with Taguchi's experimental results.Keywords: pump impeller, performance enhancement, orthogonal array, design of experiments, signal-noise ratio, analysis of variance, response analysis, computational fluid dynamic analysis LITERATURE REVIEWThe design of hydraulic machinery involves a lot of parameters that are interdependent and, in turn, iterative, which makes the problem at hand more complex for the human brain to manipulate [1 -3]. However, the innovation in computational fluid dynamic (CFD) field has made it possible to simulate and visualize some of the features of flow through rotating machines that would be difficult to measure experimentally [4 -8]. The importance of pumps in hydraulic field had been sensed by mankind over the 20th and 21st centuries (see References). The global market of today is flooded with plenty of varieties, types, and sizes of pumps. In spite of its age, even today the design of pumps has not attained the saturation stage. In fact, pump design compatible with the production environment had been a major challenge to researchers. Particularly, researchers along with engineers had been striving to improve the design of impellers with the specific attention directed to enabling the enhancement of pump performance [9 -11]. Li [12] formulated a method for analysing the performance of centrifugal oil pump, whereas Li et al. [13] analysed in their work the influence of a number of impeller blades on the performance of centrifugal oil pumps.Performance prediction procedures for centrifugal and axial flow turbomachines have been widely published by several researchers [14-18] since the early days of turbomachine design, whereas those for mixed flow machines are not well established in the open literature because of the industrial sources being classified as competition-sensitive by every industry. Sarkar [19,20] presented the performance prediction method for a mixed flow impeller on the basis of the two-dimensional cascade theory, extending Howell's [14] calculation for the analysis of axial Ã

show abstract

Computational studies of unsteady flows in a centrifugal compressor stage

Cited by 16 publications

References 16 publications

Hydrodynamically detailed performance analysis of a mixed-flow waterjet pump using computational fluid dynamics

Hydrodynamically detailed performance analysis of a mixed-flow waterjet pump using computational fluid dynamics

Numerical Analysis of Blade Geometry Generation Techniques for Centrifugal Compressors

Optimizing impeller geometry for performance enhancement of a centrifugal pump using the Taguchi quality concept

Contact Info

Product

Resources

About