Theoretical and experimental study of mechanical losses in automotive turbochargers

Serrano, José Ramón; Olmeda, Pablo; Tiseira, A.; García-Cuevas, Luis Miguel; Lefebvre, Alain

doi:10.1016/j.energy.2013.04.042

Cited by 77 publications

(69 citation statements)

References 20 publications

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“…Figure 5 shows the orbits of the shaft measured at the locations presented in Figure 3. Another aspect of interest of this study pertains to the bearing friction loss, which can be a significant part of the power losses in a turbocharger, particularly in low engine load conditions [20]. Figure 6 presents the friction losses of one bearing as a function of rotation speed, at standard operating conditions.…”

Section: Rotordynamic Response At Standard Operating Conditionsmentioning

confidence: 99%

Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

et al. 2017

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Abstract:Floating ring bearings are the commonly used type of bearing for automotive turbochargers. The automotive industry continuously investigates how to reduce the bearing friction losses and how to create silent turbochargers. Many of these studies involve creating a numerical model of the rotor-bearing system and performing validation on a test bench on which a turbocharger is driven by hot gases. This approach, however, involves many uncertainties which diminish the validity of the measurement results. In this study, we present a test setup in which these uncertainties are minimized. The measurement results show the behavior of the floating ring bearing as a function of oil feed pressure, oil feed temperature, rotor unbalance and bearing clearances. Next to an increased validity, the test setup provides measurement data with good repeatability and can therefore represent a case study which can be used for validation of rotor-bearing models.

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Section: Rotordynamic Response At Standard Operating Conditionsmentioning

confidence: 99%

Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

et al. 2017

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“…Payri et al [18] and Serrano et al [19] use this technique to characterise mechanical losses in small turbochargers. Povedin et al [6] show the influence of several parameters of the lubricating oil in the performance of a centrifugal compressor is measured also in quasi-adiabatic …”

Section: Experimental Application In Turbine Powermentioning

confidence: 99%

Uncertainties in power computations in a turbocharger test bench

et al. 2015

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A specific study of the uncertainties of turbine power output measured in turbocharger test benches is presented using the law of uncertainty propagation and the influence of the different terms that contribute to it is shown. Then, non-linear mixed integer mathematical programming algorithms used with the turbine power uncertainty expression become an essential tool to overcome the problem of selection new sensors to improve an existing test rig or to contribute to a new one. A method of optimisation is presented for two different scenarios: first, where the maximum cost is a constraint; second where the maximum uncertainty is a constraint and the total cost is minimised. When using a large transducers database, computational efforts may be reduced by solving the relaxed non-integer problem by means of sequential quadratic programming and then probing the ceilings and floors of the parameters to get an optimum approximation with low costs. A comparison between the linear uncertainty propagation model and Monte Carlo simulations is also presented, only showing benefits of the later method when computing high order statistical moments of the turbine power output probability distribution.

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“…The model is described in [19]. In figure 5 the model is adjusted to the first turbocharger experimental data.…”

Section: Model Resultsmentioning

confidence: 99%

Importance of Mechanical Losses Modeling in the Performance Prediction of Radial Turbochargers under Pulsating Flow Conditions

Serrano

Olmeda

Tiseira

et al. 2013

SAE Int. J. Engines

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This work presents a study to characterize and quantify the mechanical losses in small automotive turbocharging systems. An experimental methodology to obtain the losses in the power transmission between the turbine and the compressor is presented. The experimental methodology is used during a measurement campaign of three different automotive turbochargers for petrol and diesel engines with displacements ranging from 1.2 l to 2.0 l and the results are presented.With this experimental data, a fast computational model is fitted and used to predict the behaviour of mechanical losses during stationary and pulsating flow conditions, showing good agreement with the experimental results. During pulsating flow conditions, the delay between compressor and turbine makes the mechanical efficiency to fluctuate. These fluctuations are shown to be critical in order to predict the turbocharger behaviour.

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Theoretical and experimental study of mechanical losses in automotive turbochargers

Cited by 77 publications

References 20 publications

Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

Uncertainties in power computations in a turbocharger test bench

Importance of Mechanical Losses Modeling in the Performance Prediction of Radial Turbochargers under Pulsating Flow Conditions

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