Pulsating flow performance of a turbocharger compressor for automotive application

Marelli, Silvia; Capobianco, Massimo; Zamboni, Giorgio

doi:10.1016/j.ijheatfluidflow.2013.11.001

Cited by 40 publications

(30 citation statements)

References 28 publications

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“…An exemplary description of compressor efficiency is shown in Ref. [40]. As a result, at a mass flow rate of 7.62 Nl/min, the outlet pressure will be 1.2 bara and for a mass flow rate of 57.2 Nl/min, the outlet pressure will be 2.5 bara.…”

Section: Resultsmentioning

confidence: 99%

Pressure distribution method for ex-situ evaluation of flow distribution in polymer electrolyte membrane fuel cells

Haase

Mueller²

2015

Journal of Power Sources

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Section: Resultsmentioning

confidence: 99%

Pressure distribution method for ex-situ evaluation of flow distribution in polymer electrolyte membrane fuel cells

Haase

Mueller²

2015

Journal of Power Sources

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“…These studies show that the energy provided to the turbine is higher than the amount of energy evaluated taking into account the average pressure values before and after the turbine. The ratio between the energy provided to the turbine and the estimated energy using pressure average values is known in the technical literature as "pulsating factor" [34,35].…”

Section: Turbocompound Overviewmentioning

confidence: 99%

Turbocompound Power Unit Modelling for a Supercapacitor-Based Series Hybrid Vehicle Application

et al. 2020

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In this paper, starting from the measurements available for a 2000 cm3 turbocharged diesel engine, an analytical model of the turbocharger is proposed and validated. The model is then used to extrapolate the efficiency of a power unit with a diesel engine combined with a turbocompound system. The obtained efficiency map is used to evaluate the fuel economy of a supercapacitor-based series hybrid vehicle equipped with the turbocompound power unit. The turbocompound model, in accordance with the studies available in the technical literature, shows that the advantages (in terms of efficiency increase) are significant at high loads. For this reason, turbocompound introduction allows a significant efficiency improvement in a series hybrid vehicle, where the engine always works at high-load. The fuel economy of the proposed vehicle is compared with other hybrid and conventional vehicle configurations.

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“…As all intake valves can be shut during periods of the engine cycle, the pressure amplitudes and mass flow fluctuations of the compressor exit increase when compared to four-stroke engines. Several authors [16,18,19] have addressed the question of how pulsating exit boundary conditions affect the compressor surge limit: Correlations between among, pressure amplitude and surge mass flow rate are drawn. Numerical investigations by Shu [20] indicate that pulsating boundary conditions are advantageous in delaying the stall behavior to lower mass flow rates.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Surge Limit Prediction for Automotive Air-Charged Systems

Bühler

Leichtfuß

Schiffer

et al. 2019

IJTPP

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Compressor surge has been investigated and predicted since the early days of turbomachinery research. Experimental testing of turbomachinery applications is still needed to determine whether stable compressor operation is possible in the expected application regime. Measuring compressor maps and operating ranges on hot gas test stands is common. The test benches are designed and optimized to ensure ideal inflow and outflow conditions as well as low measurement uncertainty. Compressor maps are used to match turbocharger and application. However, a shift in surge limit, caused by the piping system or application, can only be adequately addressed with full engine tests. Ideal measurements use the corresponding piston engine in the charged-air system. This can only take place in the development process, when surge detection is unfavorable from an economic perspective. The surge model for turbochargers presented here is an extension of the Greitzer’s surge model, which considers the effect of inlet throttling. Application components, such as air filters, pipe elbows and flow straighteners, reduce pressure in front of the compressor and flow conditions might differ from those in laboratory testing. Experimental results gathered from the hot gas test stand at TU Darmstadt indicate strong variation in surge limit, influenced by inlet throttling. An extension to the surge model is developed to explain the observed phenomena. The model was validated using extensive experimental variations and matches the experienced surge limit shift. Additional measurements with a piston engine downstream of the turbocharger demonstrated the validity of the surge model. The results also show that surge is a system-dependent phenomenon, influenced by compressor aerodynamics and boundary conditions.

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Pulsating flow performance of a turbocharger compressor for automotive application

Cited by 40 publications

References 28 publications

Pressure distribution method for ex-situ evaluation of flow distribution in polymer electrolyte membrane fuel cells

Pressure distribution method for ex-situ evaluation of flow distribution in polymer electrolyte membrane fuel cells

Turbocompound Power Unit Modelling for a Supercapacitor-Based Series Hybrid Vehicle Application

Surge Limit Prediction for Automotive Air-Charged Systems

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