Experimental investigation under unsteady flow conditions on turbocharger compressors for automotive gasoline engines

Marelli, Silvia; Capobianco, Massimo

doi:10.1533/9780857096135.4a.219

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…Experimental characteristic curves of the turbomachines have been measured at the turbocharger test facility of the University of Genoa (Figure Fig. 1), fully described in previous papers [30,31,32]. The compressed air apparatus is fitted with three electrical screw compressors able to provide a total mass flow rate of about 0.6 kg/s at a maximum pressure of 8 bar.…”

Section: Experimental Results On Turbocharger Performancementioning

confidence: 99%

Evaluation of an electric turbo compound system for SI engines: A numerical approach

et al. 2016

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In a medium term scenario hybrid powertrain and Internal Combustion Engine (ICE) downsizing represent the actual trend in vehicle technology to reduce fuel consumption and CO2 emission. Concerning downsizing concept, to maintain a reasonable power level in small engines, the application of turbocharging is mandatory both for spark ignited (SI) and compression ignited (CI) engines. Following this aspect, the possibility to couple an electric drive to the turbocharger (electric turbo compound) to recover the residual energy of the exhaust gases is becoming more and more attractive, as demonstrated by several studies around the world and by the current application in the F1 Championship. The present paper shows the first numerical results of a research program in collaboration between the Universities of Pisa and Genoa. This first study is focused on the evaluation of the benefits resulting from the application of an ETC (Electric Turbo Compound) to a small twin-cylinder SI engine (900 cm3). Starting from the experimental maps of two turbines and one compressor, the complete model of a turbocharged engine was created using the AVL BOOST one-dimension code. The numerical activity then moves to the whole vehicle/powertrain modelling, considering three driving cycles and two different vehicle configurations, in order to verify the effectiveness of the proposed ETC solution. Results show that the adoption of ETC is not advantageous if used for a conventional turbocharger turbine, if the target is to optimize the overall efficiency in one specific operating point of the ICE, like in the case of range-extended electric vehicles. Besides, ETC can slightly improve the average overall efficiency when the ICE must provide variable power output, as in the case of conventional or hybrid vehicles. However, the major benefits coming from ETC are the boost range extension in the lowest engine rotational speed region and a possible reduction of turbo lag, which are key points in parallel-hybrid and especially in conventional vehicles. Concerning the whole vehicle/powertrain simulation, first results show that the ETC does not improve fuel economy of the smaller vehicle, especially when employed in urban cycles. The ETC is much more advantageous in the case of the larger vehicle, particularly when extra-urban roads or motorways are considered

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Section: Experimental Results On Turbocharger Performancementioning

confidence: 99%

Evaluation of an electric turbo compound system for SI engines: A numerical approach

et al. 2016

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“…Thanks to the availability of different pulsating flow devices it is possible to study the I/E components behavior under the effect of an unsteady flow similar to that occurring in typical automotive applications. The pulsating flow can be generated by a motor driven cylinder head fitted with a Variable Valve Actuation system [5,14] or alternatively a rotating valve device.…”

Section: Experimental Circuit and Measuring Equipementmentioning

confidence: 99%

“…In addition, the reduction of engine displacement is leading the compressor to work under heavier unsteady flow condition, which causes a deviation from the steady state, even though the significant capacity of the circuit interposed between the compressor exit and the engine [14]. This aspect is emphasized by the adoption of different control strategies using advanced intake valve actuation systems [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pulsating Flow Characteristics on Performance and Surge Limit of Automotive Turbocharger Compressors

Marelli

Carraro

Capobianco

2012

SAE Int. J. Engines

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The flow in turbocharger compressors and turbines for automotive engine application is highly unsteady in nature, as it\ud responds to the intake and exhaust manifolds of the internal combustion engine. The optimization of the turbocharger\ud system is therefore a very difficult task, since only steady flow maps are generally provided by turbocharger manufacturer.\ud For several years a specialized components test facility operates at the University of Genoa, particularly suitable to test\ud turbochargers under steady and unsteady flow conditions. The test bench has been continuously upgraded in order to study\ud components under pulsating flow condition by using different layout configurations. A recent set-up makes it possible to\ud study turbocharger compressor under unsteady flow condition by using a rotating valve pulse generator system.\ud Measurements of pressure signals downstream the compressor, instantaneous mass flow rate and turbocharger rotational\ud speed are performed.\ud In the paper the effect of both pulse characteristics (frequency - i.e., engine rotational speed -, amplitude and mean\ud value) on compressor performance is analyzed. In particular the attention is focused on the surge limit position under\ud unsteady flow operation

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“…As regards the turbine, manufacturer steady flow maps are generally defined over a restricted operating range and the effect of the regulating device on turbine performance is not taken into account if a waste-gate valve is fitted [12,13]. Besides, unsteady flow performance of both turbine and compressor must be considered in order to take into account the effect of pulsating flow generated by engine valves opening and closing [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on the performance of a turbocharger compressor in the unstable operating region and close to the surge limit

Marelli

Carraro

Marmorato

et al. 2014

Experimental Thermal and Fluid Science

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Experimental investigation under unsteady flow conditions on turbocharger compressors for automotive gasoline engines

Cited by 13 publications

References 13 publications

Evaluation of an electric turbo compound system for SI engines: A numerical approach

Evaluation of an electric turbo compound system for SI engines: A numerical approach

Effect of Pulsating Flow Characteristics on Performance and Surge Limit of Automotive Turbocharger Compressors

Experimental analysis on the performance of a turbocharger compressor in the unstable operating region and close to the surge limit

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