New Phenomenological and Power-Based Approach for Determining the Heat Flows of a Turbocharger Directly from Hot Gas Test Data

Savic, Bojan; Zimmermann, Rainer; Jander, Bojan; Baar, Roland

doi:10.29008/etc2017-258

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…As a solution to overcome these complexities, a power-based approach has been introduced first by the author of [7] that allows estimating the heat transfer rate of the turbochargers based on experimental measurements directly taken from hot gas tests. Several validations using the power-based method have been performed using CFD and CHT [8][9][10], showing satisfying agreement between the experimental and simulation results. The feasibility and reliability of the proposed approach have further been proven by [11], where the performance and heat transfer impacts of four different turbochargers were compared.…”

Section: Introductionmentioning

confidence: 94%

Experimental Energy and Exergy Analysis of an Automotive Turbocharger Using a Novel Power-Based Approach

2021

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The performance of turbochargers is heavily influenced by heat transfer. Conventional investigations are commonly performed under adiabatic assumptions and are based on the first law of thermodynamics, which is insufficient for perceiving the aerothermodynamic performance of turbochargers. This study aims to experimentally investigate the non-adiabatic performance of an automotive turbocharger turbine through energy and exergy analysis, considering heat transfer impacts. It is achieved based on experimental measurements and by implementing a novel innovative power-based approach to extract the amount of heat transfer. The turbocharger is measured on a hot gas test bench in both diabatic and adiabatic conditions. Consequently, by carrying out energy and exergy balances, the amount of lost available work due to heat transfer and internal irreversibilities within the turbine is quantified. The study allows researchers to achieve a deep understanding of the impacts of heat transfer on the aerothermodynamic performance of turbochargers, considering both the first and second laws of thermodynamics.

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Section: Introductionmentioning

confidence: 94%

Experimental Energy and Exergy Analysis of an Automotive Turbocharger Using a Novel Power-Based Approach

2021

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“…The impact of the non-adiabatic behavior of the microscale compressor main flow field was also deeply studied by CFD simulations (Sun et al, 2014). Finally, empirical-based correction methodologies have been raised to predict heat transfer coefficients and diabatic flows in small turbochargers (Serrano et al, 2015;Savic et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Diabatic flows on electrically-driven radial micro-turbocompressors

Sebastián,

Abbas,

Valdés

2023

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

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Radial compressors miniaturization entails diverse challenging aerothermal effects on their performance. Among them, an immediate downsizing-related issue comes along in the field of heat transfer because these reduced-scale machines cannot be treated as adiabatic. Resultant specific heat losses are indeed high enough to be necessarily taken into account. Furthermore, novel proposals for using electric drive technologies instead of conventional directly-coupled turbines include some particularities on their thermal behavior assessment. This is precisely why this work is focused on identifying the key underlying heat transfer mechanisms when the micro-compressor is running under diabatic conditions. The numerical results show how the diffuser and the volute provide the largest impact on the flow when dealing with diabatic walls while inlet and impeller domains provide a considerably lower impact. This finding allows the proposal of straightforward correction methods in experimentation for these diabatic flows considering compressor outlet flow properties.

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“…However, for modelling purpose, the performance data without heat transfer effects are needed. In this regards, the heat transfer correction suggested in [71,72] and as shown in the Figures 3.14 and 3.15 is applied to obtain fully isentropic efficiency for both turbine and compressor.…”

Section: Quality Of the Measurementsmentioning

confidence: 99%

“…Therefore, the heat transfer related issues for these turbochargers at hot conditions were not analyzed in this dissertation, and they will be discussed as in the future works. However, a methodology described in [71,72] has been used to get the isentropic efficiencies of both turbine and compressor. The procedures will be explained in the further sections.…”

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confidence: 99%

Experimental characterization and mean line modelling of twin-entry and dual-volute turbines working under different admission conditions with steady flow

Samala¹

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Despite the importance of radial in-flow twin-entry and dual-volute turbines for turbocharged engines, their characteristic maps and fully predictive modelling using 1D gas dynamic codes are not well established yet. The complexity of the un-steady flow and the unequal admission of these turbines, when operating with pulses of engine exhaust gas, make them a challenging system. Mainly due to the unequal flow admission, an additional degree of freedom is introduced to well-known single entry vanned or vaneless turbines. Moreover, the addition of the second inlet to the turbine volute brings extra complexity in determining the steady-state turbine performance parameters under unequal admission conditions. This thesis has a main novelty, which is a simple procedure for characterizing experimentally and elaborating characteristic maps of these turbines with unequal flow conditions. This method of analysis allows easy interpolating within the proposed distinctive maps or simple convincing models for calculating and extrapolating full performance parameters of twin-entry and dual-volute turbines.Finally, the models have been fully validated by coupling them with one-dimensional modelling software and simulated both the gas stand and the whole engine measured points. On the one hand, the validation results from the gas stand simulation show that the model can predict well all steady flow variables. On the other hand, the validation results from the whole engine simulation show that the model is able to produce all the full load engine variables like air mass flow and brake torque in a reasonable degree of agreement with the experimental data.

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New Phenomenological and Power-Based Approach for Determining the Heat Flows of a Turbocharger Directly from Hot Gas Test Data

Cited by 8 publications

References 5 publications

Experimental Energy and Exergy Analysis of an Automotive Turbocharger Using a Novel Power-Based Approach

Experimental Energy and Exergy Analysis of an Automotive Turbocharger Using a Novel Power-Based Approach

Diabatic flows on electrically-driven radial micro-turbocompressors

Experimental characterization and mean line modelling of twin-entry and dual-volute turbines working under different admission conditions with steady flow

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