Advanced Measurement and Modelling Methods of Turbochargers

Lückmann, Dominik; Stadermann, Max; Pischinger, Stefan; Kindl, Helmut

doi:10.1007/s38313-016-0055-9

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…For a distinctive allocation of a flow condition to the corresponding turbine characteristic, mass flow ratio definition has been used [25], [26]. It is defined according to Equation 1, as the mass flow rate in the shroud branch divided by the overall mass flow rate of the turbine.…”

Section: Test Methodologymentioning

confidence: 99%

Experimental approach for the characterization and performance analysis of twin entry radial-inflow turbines in a gas stand and with different flow admission conditions

Serrano

Arnau

Gracía-Cuevas

et al. 2019

Applied Thermal Engineering

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Section: Test Methodologymentioning

confidence: 99%

Experimental approach for the characterization and performance analysis of twin entry radial-inflow turbines in a gas stand and with different flow admission conditions

Serrano

Arnau

Gracía-Cuevas

et al. 2019

Applied Thermal Engineering

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“…After convergence is detected the high frequency shaft motion measurement is triggered to log for 2 s. In order to keep the boundary conditions in line with the friction test bench, all tests were carried out with the identical 5W30 oil type as well as an oil inlet temperature of T oil = 90 • C and an oil inlet pressure of p oil = 4 bar (abs.). For all operating points the thrust load was calculated using the method of Nguyen [10], which was implemented in a simulation tool by Lückmann et al in study [16]. A negative thrust load ("compressor pulls") is observed in nearly all points (Table 3).…”

Section: Hot Gas Turbocharger Test Benchmentioning

confidence: 99%

Influence of Non-Linear Rotor Dynamics on the Bearing Friction of Automotive Turbochargers

et al. 2017

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Abstract:One of the possibilities to increase the efficiency of an internal combustion engine is to enhance its interaction with the charging system. With the help of new advanced simulation tools, the rotor dynamic behavior and bearing friction losses of turbochargers (TC) can be quantified in the early stage of the development process. This procedure enables virtual bearing development, leading to shortened development times and reduced testing costs. This paper presents a detailed view of the findings in current research; focusing on rotor dynamic simulations with emphasis on the non-linear dynamics (oil whirl; oil whip) and their impact on bearing friction losses. In order to obtain a detailed understanding of these effects; elastic multibody simulations (EMBS) with elastic hydrodynamic bearing (EHD) analysis including a mass-conservative approach are used. Measurement data is obtained using a unique test bench which is designed to quantify the bearing friction losses by means of a drag test. Additionally, hot gas test bench measurements are carried out to assess the non-linear rotor dynamics during steady state operation using shaft motion measurement equipment. In the first step; a multibody simulation model of a common automotive TC is set up; and a model of the friction test bench is mapped into it. The author will show that there is a high agreement between simulated and measured friction losses. In the second step; the TC model is detached from the virtual test bench and a variation of the essential parameters are carried out to identify the influence of the non-linear rotor dynamics on the bearing friction. A final model validation is obtained by comparing the measured shaft orbits for the TC hot gas test bench with the results from the multibody simulation.

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Improvement in accuracy of engine cycle simulations by using a turbocharger prediction model instead of measured efficiency map

Misono

Kuboyama

Moriyoshi

et al. 2021

J. Phys.: Conf. Ser.

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In the downsizing concept, the turbocharger (T/C) is one of the key devices for improving thermal efficiency and exhaust emissions of internal combustion engines for automobiles. In order to maximize the supercharged engine performance, the size of the T/C applied for the given engine system has been optimized by using a 1-D engine cycle simulation. For this reason, T/C performance prediction model for engine cycle simulation is required to be accurate over a wide operating range. In the conventional T/C performance prediction model, the turbine performance was predicted by extrapolating from the efficiency map measured under steady flow. However, the accuracy of the extrapolation method is uncertain, and it has been pointed out that the prediction accuracy is low in the low load operations. In this study, a 1-D T/C model developed based on hydrodynamics and thermodynamics was used. Using the 1-D T/C model, a grid efficiency map over the entire operating range was calculated and the grid map was applied to 1-D engine cycle simulation. The accuracy of the T/C model was verified by comparing the experimentally measured efficiency under steady flow.

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Advanced Measurement and Modelling Methods of Turbochargers

Cited by 5 publications

References 3 publications

Experimental approach for the characterization and performance analysis of twin entry radial-inflow turbines in a gas stand and with different flow admission conditions

Experimental approach for the characterization and performance analysis of twin entry radial-inflow turbines in a gas stand and with different flow admission conditions

Influence of Non-Linear Rotor Dynamics on the Bearing Friction of Automotive Turbochargers

Improvement in accuracy of engine cycle simulations by using a turbocharger prediction model instead of measured efficiency map

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