The Design and Testing of a Radial Flow Turbine for Aerodynamic Research

Huntsman, I.; Hodson, H. P.; Hill, Simon

doi:10.1115/91-gt-220

Cited by 9 publications

(8 citation statements)

References 6 publications

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“…Also, very near the shroud, the surface flow is directed toward the hub due to the wall dragging. These observation are consistent with experimental flow visualizations of Huntsman et al [15].…”

Section: Computational Evidencesupporting

confidence: 82%

Navier-Stokes analysis of radial turbine rotor performance

Larosiliere

1993

29th Joint Propulsion Conference and Exhibit

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ABSTRACTspecific fuel consumption requirements have been reported by Snyder and Roelke [1]. An analysis of flow through a radial turbine rotor using the three-dimensional, thinlayer Navier-Stokes code RVC3D is described. The rotor is a solid version of an air-cooled metallic radial turbine having thick trailing edges, shroud clearance, and scalloped-backface clearance. Results are presented at the nominal operating condition using both a zero-clearance model and a model simulating the effects of the shroud and scalloped-backface clearance flows. A comparison with the available test data is made and details of the internal flow physics are discussed, allowing a better understanding of the complex flow distribution within the rotor.

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Section: Computational Evidencesupporting

confidence: 82%

Navier-Stokes analysis of radial turbine rotor performance

Larosiliere

1993

29th Joint Propulsion Conference and Exhibit

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“…The radial inflow turbine has been described by Huntsman et al (1991Huntsman et al ( , 1993Huntsman et al ( and 1994 in detail. The working section is shown schematically in Figure 1.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…The flow features of the rotor tip region were visualised by using Ammonia gas and "Ozalid" paper. This technique was previously used by Huntsman et al (1991) in the same rig. The diazo paper was stuck onto the flat surface of the blade tip, using double-sided adhesive tape.…”

Section: Flow Visualisation In the Tip Gap Regionmentioning

confidence: 99%

An Experimental Study of Tip Clearance Flow in a Radial Inflow Turbine

Dambach

Hodson

Huntsman

1998

Volume 1: Turbomachinery

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This paper describes an experimental investigation of tip clearance flow in a radial inflow turbine. Flow visualisation and static pressure measurements were performed. These were combined with hot-wire traverses into the tip gap. The experimental data indicates that the tip clearance flow in a radial turbine can be divided into three regions. The first region is located at the rotor inlet, where the influence of relative casing motion dominates the flow over the tip. The second region is located towards midchord, where the effect of relative casing motion is weakened. Finally a third region exists in the exducer, where the effect of relative casing motion becomes small and the leakage flow resembles the tip flow behaviour in an axial turbine.

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“…The basic guideline is to generalize the criterion for the optimization of the turbine blade row on one blade cross-section to all blade cross-sections. Huntsman et al [12] applied similar approach when selecting general dimensions of the radial gas turbine inlet guide vanes. The example in [12] is simple since the inlet (at radius R 1 ) and outlet blade edge (at radius R 2 ) are parallel to the turbine axis; R 2 < R 1 , see Fig.…”

Section: Theoretical Determination Of the Best Design Pointmentioning

confidence: 98%

“…Referring to the inlet guide vanes [12], the coefficient C Y = 0.6 was taken as the initial value. In the case of a hydraulic turbine, one should be more conservative and use a lower value of C Y in order to avoid cavitation i.e.…”

Section: Theoretical Determination Of the Best Design Pointmentioning

confidence: 99%

Mixed-flow vertical tubular hydraulic turbine: determination of proper design duty point

Höfler¹,

Širok

Bergant

2011

Forsch Ingenieurwes

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A new vertical single-regulated mixed-flow turbine with conical guide apparatus and without spiral casing is presented in this paper. Runner blades are fixed to the hub and runner band and resemble to the Francis type runner of extremely high specific speed. Due to lack of information and guidelines for the design of a new turbine, a theoretical model was developed in order to determinate the design duty point, i.e. to determine the optimum narrow operation range of the turbine. It is not necessary to know the kinematic conditions at the runner inlet, but only general information on the geometry of turbine flow-passage, meridional contour of the runner and blading, the number of blades and the turbine speed of rotation. The model is based on the integral tangential lift coefficient, which is the average value over the entire runner blading. The results are calculated for the lift coefficient 0.5 and 0.6, for the flow coefficient range from 0.2 to 0.36, for the number of the blades between 5 and 13, and are finally presented in the Cordier diagram (specific speed vs. specific diameter). Calculated results of the turbine optimum operation in Cordier diagram correspond very well to the adequate area of Kaplan turbines with medium and low specific speed and extends into the area of Francis turbines with high specific speed. Presented model clearly highlights the parameters that affect specific load of the runner blade row and therefore the E. Höfler ( ) Gradišče XV-5, optimum turbine operation (discharge-turbine head). The presented method is not limited to a specific reaction type of the hydraulic turbine. The method can therefore be applied to a wide range from mixed-flow (radial-axial) turbines to the axial turbines. Applicability of the method may be considered as a tool in the first stage of the turbine design i.e. when designing the meridional geometry and selecting the number of blades according to calculated operating point. Geometric and energy parameters are generally defined to an extent that these parameters are considered in detailed design using turbulent viscous flow CFD solver. Vertikale halbaxiale Wasserrohrturbine: Bestimmung des richtigen Entwicklungs-BetriebspunktesZusammenfassung Dargestellt wird eine neue vertikale einfach regulierte diagonale Rohrturbine mit konischem Leitapparat und ohne Spiralgehäuse. Die Laufradschaufeln sind an der Laufradnabe und dem Laufradkranz befestigt. Der Drehzahl nach gleicht das Laufrad dem Francislaufrad; es weist eine extrem hohe spezifische Drehzahl auf. Infolge der nicht verfügbaren Angaben und Anweisungen für die Gestaltung der neuen Turbine wird ein theoretisches Modell der Bestimmung des Betriebspunktes, bzw. der Bestimmung des engeren Bereichs des optimalen Betriebs der ganzen Turbine entwickelt. Für die Berechnung ist es nicht notwendig, kinematische Konstellationen bei dem Laufradeintritt zu kennen, sondern nur die Grundangaben: die Geometrie des Strömungskanals der Turbine, die Meridiankontur von Laufrad und Schaufeln, die Zahl dieser Schaufeln und die T...

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The Design and Testing of a Radial Flow Turbine for Aerodynamic Research

Cited by 9 publications

References 6 publications

Navier-Stokes analysis of radial turbine rotor performance

Navier-Stokes analysis of radial turbine rotor performance

An Experimental Study of Tip Clearance Flow in a Radial Inflow Turbine

Mixed-flow vertical tubular hydraulic turbine: determination of proper design duty point

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