Modeling of Three-Dimensional Flow in Turning Channels

Khalil, Imane; Weber, H. G.

doi:10.1115/1.3239624

Cited by 9 publications

(8 citation statements)

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“…• The calculation of the scroll's flow, including the vane support [1,2] • The measurement and calculation of the scroll's flow, without the vane support [3][4][5][6][7][8][9][10][11][12] It is necessary to mention that the present experimental scroll investigations using a stator are mostly carried out without vanes.…”

Section: Symbolsmentioning

confidence: 99%

Experimental Analysis and Numerical Simulation of the Flow Field in Turbine Scrolls

Menter

Klima

Pfost

1998

Volume 1: Turbomachinery

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A large selection of one- and two-dimensional methods can be used to calculate the scroll geometries. This paper examines the consequences of different scroll geometry parameters under various flow configurations, including the influence of components in the scroll flow field. A combination of arrangements of the various components was investigated, (scroll/nozzle/rotor, scroll/nozzle/stator, scroll/vane support/rotor, scroll/vane support/stator), to see how the flow varied. In this particular case a frictionless scroll was designed. The turbine operates with a gas fluid. Using a non-invasive laser two-focus technique and wall pressure drillings the flow field was measured over three scroll cross sections and over its extent at φ = 186° up to φ = 211°. The theoretical analysis was performed on a computer using a commercial 3D finite element programme. Using the programme enables the theoretical flow fields of various scroll geometries to be calculated. The validity of the calculations can be assessed by comparing the theoretical calculations with the above mentioned measurements. The measurements show that by using a rotor the flow field inside the scroll remains uninfluenced by the vane support and nozzle. Measurable differences appear when the rotor is replaced by a stator, these results are confirmed by the computer program. The calculations also show that the scroll geometry has an important effect on the development of the flow field.

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Section: Symbolsmentioning

confidence: 99%

Experimental Analysis and Numerical Simulation of the Flow Field in Turbine Scrolls

Menter

Klima

Pfost

1998

Volume 1: Turbomachinery

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“…While inside the blade, coolant air generally flows through a complicated serpentine passage --full of twists and turns with rows of pin fins interspersed throughout 3 So far, most mathematical studies of the detailed fluid mechanics and heat transfer taking place within turbine blade coolant passages have made two major simplifying assumptions [e.g., see Refs. 4 and 51. The first major simplifying assumption is that the coolant flow is incompressible.…”

Section: Introductionmentioning

confidence: 98%

Algebraic grid generation for coolant passages of turbine blades with serpentine channels and pin fins

Shih

Roelke

Steinthorsson

1991

27th Joint Propulsion Conference

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In order to study numerically details of the flow and heat transfer within coolant passages of turbine blades, a method must fist be developed to generate grid systems within the very complicated geometries involved. In this study, a grid generation package was developed that is capable of generating the required grid systems. The package developed is based on an algebraic grid generation technique that permits the user considerable control over how grid points are to be distributed in a very explicit way. These controls include orthogonality of grid lines next to boundary surfaces and ability to cluster about arbitrary points, lines, and surfaces. This paper describes that grid generation package and shows how it can be used to generate grid systems within complicated-shaped coolant passages via an example.

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“…Such methods handled compressible, inviscid flows and solved a velocity potential equation by finite element or finite difference discretisation. Three-dimensional solutions have been described by Hamed and Baskharone (1980), again solving a velocity potential equation using finite element methods, and by Khalil and Weber (1984) and Chen, Lee and Huang (1985), both using finite difference solutions. Most solutions have been inviscid, but that by Khalil and Weber (1984) handles viscous flows by solving the time-averaged Navier-Stokes equations.…”

Section: Introductionmentioning

confidence: 99%

“…The point at which the circulating flow re-enters the mainstream flow at the tip of the tongue often calls for special treatment, and in the velocity potential method a discontinuity in the derivative of velocity, but not velocity itself, may be permitted (Hamed and Baskharone, 1980). In finite difference solutions multiply-connected elements are commonly required (Khalil and Weber, 1984).…”

Section: Introductionmentioning

confidence: 99%

“…In some cases the computational grid is taken further downstream than the physical exit from the volute in the hope that the effects of such simplifying assumptions will not propagate so far upstream as to influence the flow conditions which are calculated at the true exit. Khalil and Weber (1984) represent the turbine rotor as a centrifugal force on the outflow boundary of magnitude such that the total mass flow through that boundary is equal to that entering the volute. Some justification for this is shown by a good agreement with measurements of an exit static pressure distribution.…”

Section: Introductionmentioning

confidence: 99%

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Flow in Single and Twin Entry Radial Turbine Volutes

Lymberopoulos

Baines

Watson

1988

Volume 1: Turbomachinery

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This paper presents a numerical analysis and experimental measurements of flows in the vaneless volute of a radial–inflow turbine. Cases of single and twin entry to the volute were studied, and in particular the case of unequal flows, or partial admission, to the two entries. The distance between the rotor tip and the limit of the internal wall separating the two flows was varied in order to study the effects of interaction of the two streams. The computational model is based on a quasi–three–dimensional solution of the Euler equations, in which the radial and tangential components of velocity are fully solved, but the axial component is only treated to simulate the mixing of the two streams. The results of the model were compared with published results for a single entry, and extensive new results for a single or twin entry, casing. Even in the single and equal flow twin–entry cases, significant variations in flow properties around the exit circumference of the volutes were observed, most particularly in the region of re–entry near the tongue. For unequal flows the interaction of the two streams was strong and increased with increasing separating wall diameter, and with increasing inequality of flow rates. In extreme cases the flow reverses.

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Modeling of Three-Dimensional Flow in Turning Channels

Cited by 9 publications

References 0 publications

Experimental Analysis and Numerical Simulation of the Flow Field in Turbine Scrolls

Experimental Analysis and Numerical Simulation of the Flow Field in Turbine Scrolls

Algebraic grid generation for coolant passages of turbine blades with serpentine channels and pin fins

Flow in Single and Twin Entry Radial Turbine Volutes

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