Using a CFD analysis of the flow capacity in a twin-entry turbine to develop a simplified physics-based model

Galindo, José; Serrano, José Ramón; Medina, Nicolás

doi:10.1016/j.ast.2021.106623

Cited by 12 publications

(24 citation statements)

References 49 publications

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“…The model proposed studies twin-entry turbines as two separated single-entry turbines. This hypothesis is based on the results obtained in Galindo et al 19…”

Section: Hypotheses To Validatementioning

confidence: 95%

“…They help to extrapolate and predict twin-entry turbines performance. The authors of this work are also developing a one-dimensional loss-based model described in Galindo et al 19,20 It takes into account the losses due to the momentum exchange between flow branches. These losses produce a strong effect on the performance prediction in unequal admission conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the hypotheses used for developing the one-dimensional twin-entry turbine model are corroborated with LDA measurements. Moreover, the CFD simulations used in previous works 19,29 are locally validated in the outlet section with these experimental results. The hypotheses to validate are presented in section Hypotheses to Validate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…The model proposed studies twin-entry turbines as two separated single-entry turbines. This hypothesis is based on the results obtained in Galindo et al 19…”

Section: Hypotheses To Validatementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…These variable geometry nozzles in the stator help to extend the operating range of the turbine; meanwhile, the matching with the compressor side can be achieved by the use of a ported shroud [21]. Uniform distribution over the 360 degrees of the radial stator is important to then adapt the flow at the rotor inlet, a matter of interest in [22], where they tested flow behavior for twin-entry turbines as two separated single VGT volutes. Therefore, while some authors focus on a volute casing optimization, as in [23], the stator and its vanes must be designed according to an aerodynamic geometry that has the least possible amount of energy losses [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation in a Scaled Rotor-Less Nozzle Vaned Radial Turbine Model under Variable Geometry Conditions

et al. 2022

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The widespread trend of pursuing higher efficiencies in radial turbochargers led to the prompting of this work. A 3D-printed model of the static parts of a radial variable geometry turbine, the vaned nozzle, and the volute, was developed. This model was up-scaled from the actual reference turbine to place sensors and characterize the flow around the nozzle vanes, including the tip gap. In this study, a computational model of the scaled-up turbine was carried out to verify the results in two ways. For this model, firstly compared with an already validated CFD turbine model of the real device (which includes a rotor), its operating range was extended to different nozzle positions, and we checked the issues with rotor–stator interactions as well as the influence of elements such as the screws of the turbine stator. After showing results for different nozzle openings, another purpose of the study was to check the effect of varying the clearance over the tip of the stator vanes on the tip leakage flow since the 3D-printed model has variable gap height configurations.

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“…where a substantial deviation between the mixed flow turbine performance under pulsating flow at different frequencies and that at steady flow conditions was reported. Recently Galindo et al [21] employed 3D CFD modelling capability to analyse the flow behaviours of twin-entry turbines as well as improving the predictability of 1D twin-entry turbine model.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of a Radial Flow Turbine Operates Under Various Pulsating Flow Shapes and Amplitudes

Rezk

Sharma

Barrans

et al. 2021

Journal of Energy Resources Technology

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Radial flow turbines are extensively used in turbocharging technology due to their unique capability of handling a wide range of exhaust gas flow. The pulsating flow nature of the internal combustion engine exhaust gases causes unsteady operation of the turbine stage. This paper presents the impact of the pulsating flow of various characteristics on the performance of a radial flow turbine. A three-dimensional computational fluid dynamic model was coupled with a one-dimensional engine model to study the realistic pulsating flow. Applying square wave pulsating flow showed the highest degree of unsteadiness corresponding to 92.6% maximum mass flow accumulation due to the consecutive sudden changes of the mass flowrates over the entire pulse. Although sawtooth showed a maximum mass flow accumulation value of 88.9%, the mass flowrates entailed gradual change and resulted in the least overall mass flow accumulation over the entire pulse. These two extremes constrained the anticipated performance of the radial flow turbine that operates under realistic pulsating flow. Such constraints could develop an operating envelope to predict the performance and optimize radial flow turbines’ power extraction under pulsating flow conditions.

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Using a CFD analysis of the flow capacity in a twin-entry turbine to develop a simplified physics-based model

Cited by 12 publications

References 49 publications

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

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

Numerical Evaluation in a Scaled Rotor-Less Nozzle Vaned Radial Turbine Model under Variable Geometry Conditions

Computational Study of a Radial Flow Turbine Operates Under Various Pulsating Flow Shapes and Amplitudes

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