Development of a turbocharger compressor with variable geometry for heavy-duty engines

Wöhr, Michael; Chebli, Elias; Müller, Marc F.; Zellbeck, Hans; Leweux, Johannes; Gorbach, Andreas

doi:10.1177/1468087414562457

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…Thus, the influence of pulsation on the compressor performance has not been taken into account. 6 Consequently, the overall performance of turbocharged engine can’t be optimized and hence the potential of the engine performance can’t be optimized, especially at strong pulsating conditions, such as transient operating condition, high engine speed or load. At the meantime, the design methodology of the turbocharger compressor is non-exceptionally based on the stable exit boundary condition.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the unsteadiness of centrifugal compressor exposed to pulsating backpressure

Shu

Yang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Centrifugal compressor is exposed to pulsating backpressure due to the movement of intake valves in internal combustion engine. The performance of compressor deviates from the steady performance map, which affects the matching between turbocharger and engine. The behavior of compressor system at pulsation conditions are investigated via an in-house developed 1D unsteady code validated by experimental results. The influence of pulse frequency, magnitude and compressor characteristic curve on the compressor transient responses, including filling-emptying effect and wave dynamics, are analyzed. Results show that the strength of wave dynamics grows stronger with the increasing of pulse frequency, while the strength of filling-emptying effect increases first then decreases. The rise of pulse magnitude results in an almost linearly increasing of filling-emptying effect, while it can hardly affect the wave dynamics. Furthermore, the influence of pulsation magnitude and frequency represents the influence of local pressure gradient, and a correlation as quadratic curve can be evaluated between the pressure gradient and compressor unsteadiness. On the other hand, the influence of operating point, including the average mass flow rate and the slope of characteristic curve, is confirmed to be evidently smaller, comparing to the influence of pulsation frequency and magnitude. This study is helpful to estimate the behavior of compressor and the discrepancy of performance when operating at unsteady environment or matched with engine.

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Section: Introductionmentioning

confidence: 99%

Investigation on the unsteadiness of centrifugal compressor exposed to pulsating backpressure

Shu

Yang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

“…A severe problem concerning turbocharging is the poor low-end torque of turbocharged engines. 9–11 At low engine shaft speeds, the air charging system of an engine works at a low mass flow rate where the compressor is likely to be involved in surge or stall and to fail to compress air stably, in particular at high pressure ratios. If the compressor cannot feed the cylinders with a high pressure intake as needed, the engine cannot produce sufficient low-end torque.…”

Section: Introductionmentioning

confidence: 99%

“…Wöhr et al 11 predicted that variable diffuser vanes can help an engine to achieve a lower fuel consumption and better low-end torque characteristics. This study will go into detail about the compressor aerodynamics and the improvement in the torque performance obtained by using variable diffuser vanes was quantitatively estimated.…”

Section: Introductionmentioning

confidence: 99%

Potential of variable diffuser vanes for extending the operating range of compressors and for improving the torque performance of turbocharged engines

Huang

Zheng

2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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Turbocharging plays a significant role in internal-combustion engines. For engines in the future or for engines operating at a high altitude, compressors which are able to deliver a high pressure ratio are preferable. However, the poor low-end torque characteristics of turbocharged engines, which are often restricted by the narrow operating range of compressors at a high pressure ratio, result in a severe problem for turbocharging. The use of variable diffuser vanes is an effective method to increase the operating range, but the potential of an extended operating range at a high pressure ratio and improvement in the torque performance of engines is unclear. Nowadays, the pressure ratio of a turbocharger compressor may be only 1–4. Because of the increase in the pressure ratio, estimating the potential is ultimately worthwhile. In this paper the performances of a centrifugal compressor with different diffuser vane angles are investigated, the range extension and the improvement in the torque performance which benefited from variable diffuser vanes are estimated and the mechanisms for range extension are revealed. The approach includes steady three-dimensional Reynolds-averaged Navier–Stokes simulations and theoretical analysis. Adjusting the vane angle from −10° to 10° improves the operating range of a compressor from 23.5% (with fixed vanes) to 54.9% at a pressure ratio of 4.8. The range extension is obtained by utilizing the shifts in the choke line and the surge line. A method of assessing the choking component based on the simulation results is proposed. The diffuser, the flow stability of which was enhanced comparatively by closing it (pivoting the vanes by −10° and −5°), contributes mainly to reducing the surge flow. With this range extension, the improvement in the maximum torque is estimated to be 78%.

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“…From these articles published in the THIESEL 2014 conference proceedings, 1 11 were selected and submitted for peer review in the International Journal of Engine Research . Selected papers include two papers related to fuel injection, 4,5 two papers on turbocharging 6,7 and seven papers on combustion. 8 –14…”

mentioning

confidence: 99%

“…One of the papers on turbocharging deals with the acoustic characterization of turbocompressors 7 using a piezoelectric sensor array and real exhaust gases, finding that in-duct noise measurements offer a cost-effective way to characterize the sound field generated by the compressor. Wöehr et al 6 present a new variable geometry turbine used for heavy-duty engines and find that tangential velocity in the diffuser is not only beneficial for the efficiency at low mass flow rates but also holds the capability to influence the surge margin and thus helps to accomplish the needed torque at low engine speeds.…”

mentioning

confidence: 99%

Editorial: Thermo- and fluid-dynamic processes in direct injection engines – THIESEL 2014 Special Issue

Payri¹

2015

International Journal of Engine Research

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Development of a turbocharger compressor with variable geometry for heavy-duty engines

Cited by 9 publications

References 8 publications

Investigation on the unsteadiness of centrifugal compressor exposed to pulsating backpressure

Investigation on the unsteadiness of centrifugal compressor exposed to pulsating backpressure

Potential of variable diffuser vanes for extending the operating range of compressors and for improving the torque performance of turbocharged engines

Editorial: Thermo- and fluid-dynamic processes in direct injection engines – THIESEL 2014 Special Issue

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