Experimental and Theoretical Investigation of Twin-Entry Radial Inflow Gas Turbine With Unsymmetrical Volute Under Full and Partial Admission Conditions

Aghaali, Habib; Hajilouy-Benisi, Ali

doi:10.1115/gt2007-27807

Cited by 12 publications

(9 citation statements)

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“…Despite these improvements, some new phenomena arise in the space after the union of both volutes that must be taken into account. Numerous authors have experimentally characterised twin-entry turbines focusing on the blade loading loss in the rotor as Aghaali and Hajilouy-Benisi, 14 the acoustic response as Serrano et al, 15 the swallowing capacity as Romagnoli et al, 16 the effect of integrating a balance valve as Jin et al 17 or the unequal admission conditions as Brinkert et al 18 Other authors have carried out a loss analysis of twin-entry turbines using also CFD simulations. Xue et al 19 simulated a twin-entry mixed flow nozzled turbine and they calculated the losses separately for the volute, the nozzle and the rotor using loss coefficients based on the stagnation pressure for each part.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Twin-entry turbine losses: An analysis using CFD data

Galindo

Serrano

Medina

2021

International Journal of Engine Research

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The current paper presents a computational fluid dynamics (CFD) flow behaviour and losses analysis of twin-entry radial turbines in terms of its Mass Flow Ratio ( MFR, the ratio between the flow passing through one of its intake ports and its total mass flow), focusing on the mixing phenomena in the unequal admission conditions cases. The CFD simulations are first validated with experimental data. Then, the losses mechanisms are analysed and quantified in the different parts of the twin-entry turbine in terms of the MFR value. A sudden expansion is found at the junction of both branches in the interspace between volutes and rotor for unequal and partial admission cases. Tracking the flow coming from each of the turbine intake ports, it has been observed that both flow branches do not fully mix with each other within the rotor. Another source of losses has been identified in the contact between both flow branches due to their momentum exchange that depends on the difference between both flow branches velocities. These losses have not been considered before, and they should be included in mean line loss-based models for twin-entry turbine since they are very significant for unequal admission conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Twin-entry turbine losses: An analysis using CFD data

Galindo

Serrano

Medina

2021

International Journal of Engine Research

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“…However, twin-entry turbines present new issues in the interspace between both volute outlets and the rotor inlet. Aghaali and Hajilouy-Benisi 9 and Brinkert et al 10 carried out experimental tests for analysing the effect of the different admission conditions. These studies demonstrated the flow admission conditions have a strong effect on the flow behaviour.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of the rotor outlet flow in a twin-entry radial turbine by means of Laser Doppler Anemometry

Galindo

Tiseira

García-Cuevas

et al. 2021

International Journal of Engine Research

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The current paper presents the validation of some hypotheses used for developing a one-dimensional twin-entry turbine model with experimental measurements. A Laser Doppler Anemometry (LDA) technique has been used for measuring the axial Mach number and for counting the number of particles downstream of the rotor outlet. These measurements have been done for different mass flow ratio (MFR) and reduced turbocharger speed conditions. The flow coming from each turbine entry does not fully mix with the other within the rotor since, downstream of the rotor, they can still be differentiated. Thus, the hypothesis of studying twin-entry turbines as two separated single-entry turbines in one-dimensional models is corroborated. Moreover, the rotor outlet area corresponding to each flow branch has linear trends with the MFR value. Therefore, the rotor outlet effective area used for one-dimensional models should vary linearly with the MFR value.

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“…[4]. Recently, Aghaali et al [5] were interested in performance characteristics of radial turbine of a double input turbocompressor with an asymmetric volute at stationary state taking into consideration the complete and partial admission conditions. Sloteman et al [6] had developed a design methodology based on the combination of one-dimensional analysis method of performance and an inverse method for blade generation.…”

Section: Introductionmentioning

confidence: 99%