Flow in Single and Twin Entry Radial Turbine Volutes

Lymberopoulos, N.; Baines, N. C.; Watson, N.

doi:10.1115/88-gt-59

Cited by 16 publications

(10 citation statements)

References 9 publications

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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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“…However, twin-entry turbine flow field investigation under partial admission conditions is rare in open literature. Lymberoppoulos et al [12] published experimental and numerical study on flow field in the twin-entry volute under partial admission conditions. Yeo and Baines [13] performed experimental volute flow field investigation using laser-two-focus velocimeter under full and partial admission conditions of the rotor inlet flow.…”

Section: Introductionmentioning

confidence: 99%

Flow and performance characteristics of twin-entry radial turbine under full and extreme partial admission conditions

2009

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This paper presents numerical and experimental investigation of the performance and internal flow field characteristics of twin-entry radial inflow turbines at full and extreme partial admission conditions. The turbine is tested on a turbocharger test facility, which was developed for small and medium size turbochargers. Experimental results show that the lowest efficiency corresponds to extreme conditions. Therefore, flow field analyzing is employed to consider these conditions. The flow pattern in the volute and impeller of a twin-entry turbine is analyzed using an in-house fully three-dimensional viscous flow solver. The computational performance results are compared with the experimental results and good agreement is found. The flow field at the outlet of the turbine is investigated using a five-hole pressure probe; the numerical results are also compared with experimental measurements at the outlet of the rotor. For the volute, results show that lowest entropy gain factor corresponds to the extreme conditions, particularly when shroud side entry is fully closed. At the inlet of the rotor for equal admission conditions, the incidence angle is mostly in the optimum values. However, large variation in the incidence angle is seen in the extreme conditions, which lead to larger incidence losses and consequently a lower efficiency. In addition, entropy distribution contours corresponding to the exit plane are considered. For full admission, the location of low entropy gain factor at this plane occupies a region near the shroud side of suction surface as well as near the hub side of the pressure surface that corresponds to a region of high absolute flow angle. However, for the extreme cases, the low entropy gain factor occupies a relatively larger region near the shroud side than full admission. So, higher loss generation is noted at the extreme cases. Moreover, this entropy gain factor region is increased when shroud side entry is fully closed.

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“…Chapple [1] reported that longer and shorter bend lengths reduce the turbine efficiency. The cross section geometry affects greatly the turbine performance as emphasized by Lymberopoulos et al [2]. Up to 1.5 per cent variation in turbine total to total efficiency has been recorded by Barnard and Benson [3].…”

Section: Introductionmentioning

confidence: 99%

Design and Flow Analysis of Radial and Mixed Flow Turbine Volutes

Hamel

Hamidou

Cherif

et al. 2008

Volume 6: Turbomachinery, Parts A, B, and C

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Radial and mixed flow turbines which are an important component of a turbocharger consist essentially of a volute, a rotor and a diffuser. Vaneless volute turbines, which have reasonable performance and low cost, are the most widely used in turbochargers for automotive engines. Care has to be done in the design of the volute, whose function is to convert a part of the engine exhaust gas energy into kinetic energy and direct the flow towards the rotor inlet at an appropriate flow angle with reduced losses. Turbulent compressible flow analysis and performance prediction using the finite volume method with two turbulence models (RNG k-ε and SST) implemented in the ANSYS-CFX software, are carried out on two different volute types. Four volutes, with different cross section areas used for radial turbines, are studied and the computed results are compared with the available experimental data. The second volute studied is the one used for a mixed flow turbine in the turbocharger test rig at Imperial College. In this part of the study, the interest is focused on the influence of the volute inlet flow conditions on its performance (efficiency, exit flow angle, etc).

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Flow in Single and Twin Entry Radial Turbine Volutes

Cited by 16 publications

References 9 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

Flow and performance characteristics of twin-entry radial turbine under full and extreme partial admission conditions

Design and Flow Analysis of Radial and Mixed Flow Turbine Volutes

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