A New Streamline Curvature Throughflow Method for Radial Turbomachinery

Casey, Michael; Robinson, Chris

doi:10.1115/gt2008-50187

Cited by 22 publications

(29 citation statements)

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“…which is identical to the equation for polytropic efficiency for a compressor given in equation (1). Note that an alternative formulation of this equation can be derived from the equations above and leads to …”

Section: Entropy-based Polytropic Efficiencymentioning

confidence: 95%

Accounting for losses and definitions of efficiency in turbomachinery stages

Casey

2007

Proceedings of the Institution of Mechanical Engineers, Part A:

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A method of accounting for losses and defining efficiencies in the blade rows of adiabatic turbomachinery stages is described. This is based on the concept of specific dissipation work which is the integral of the product of local temperature and entropy change due to the losses T ds . This formulation allows various entropy-based efficiencies and loss coefficients to be derived with equations that are exact for all types of fluid (liquids, ideal gases, and real gases). The expressions for the polytropic and isothermal efficiency, as well as for the Markov blade row loss coefficient, resulting from this can be directly visualized in a Mollier chart (h-s diagram) as the ratio of entropy and enthalpy changes between two real states and a single virtual state.

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Section: Entropy-based Polytropic Efficiencymentioning

confidence: 95%

Accounting for losses and definitions of efficiency in turbomachinery stages

Casey

2007

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…), operating conditions (including mass flow, temperature, pressure, etc.) according to the 2-D streamline curvature method [15,16] or Computational Fluid Dynamics (CFD) [17]. Compared with the 2-D streamline curvature method, the CFD method is much more accurate [17], thus, it was adopted here to calculate the average-wised variables on S 2m surface.…”

Section: Modified Inverse Design Methodsmentioning

confidence: 99%

“…The variables are selected from the sail-like constrained area, and they are then used to establish the swirl velocity with Eq. (16).…”

Section: Application Of the Constrained Area In The Design Theorymentioning

confidence: 99%

Application of the Modified Inverse Design Method in the Optimization of the Runner Blade of a Mixed-Flow Pump

Wang

et al. 2018

Chin. J. Mech. Eng.

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To improve the design speed and reduce the design cost for the previous blade design method, a modified inverse design method is presented. In the new method, after a series of physical and mathematical simplifications, a sail-like constrained area is proposed, which can be used to configure different runner blade shapes. Then, the new method is applied to redesign and optimize the runner blade of the scale core component of the 1400-MW canned nuclear coolant pump in an established multi-optimization system compromising the Computational Fluid Dynamics (CFD) analysis, the Response Surface Methodology (RSM) and the Non-dominated Sorting Genetic Algorithm-II (NSGA-II). After the execution of the optimization procedure, three optimal samples were ultimately obtained. Then, through comparative analysis using the target runner blade, it was found that the maximum efficiency improvement reached 1.6%, while the head improvement was about 10%. Overall, a promising runner blade inverse design method which will benefit the hydraulic design of the mixed-flow pump has been proposed. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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“…Wennerstrom [10] made an accurate account of the blade and dissipation forces on the meridional flow field. His approach was then used by Bohn and Kim [11], Casey and Roth [12] and Casey and Robinson [13]. A more recent overview on the structure of SCM was given by Cumpsty [14] and Schobeiri [15].…”

Section: Basic Hydraulic Design Using the Streamline Curvature Methodsmentioning

confidence: 99%

Hydraulic Design and Analysis of the Saxo-Type Vertical Axial Turbine

Höfler

Gale

Bergant

2011

Transactions of the Canadian Society for Mechanical Engineering

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The paper presents a procedure for hydraulic design and analysis of the blade geometry of a high specific speed runner of the Saxo-type double-regulated vertical axial turbine. The meridional through-flow in the passage from the conical guide vane apparatus to the draft-tube elbow is designed by a streamline curvature method (SCM). To validate the design method and predictions and to investigate the design duty point and a number of off-design operating regimes, an extensive CFD simulation inside the entire turbine water-passage is performed. The flow patterns downstream the guide vane apparatus and the runner exit flow are analyzed. The focus of the analysis is on distribution of the angular momentum alongside the turbine, as well as on its impact on the flow around the runner blades. The SCM design procedure presented in the paper proves to be a robust and accurate tool for the runner blade row design.

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A New Streamline Curvature Throughflow Method for Radial Turbomachinery

Cited by 22 publications

References 0 publications

Accounting for losses and definitions of efficiency in turbomachinery stages

Accounting for losses and definitions of efficiency in turbomachinery stages

Application of the Modified Inverse Design Method in the Optimization of the Runner Blade of a Mixed-Flow Pump

Hydraulic Design and Analysis of the Saxo-Type Vertical Axial Turbine

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