Experimental response surface study of the effects of low-pressure exhaust gas recirculation mixing on turbocharger compressor performance

Reihani, Amin; Hoard, John; Klinkert, Stefan; Kuan, Chih-Kuang; Styles, Daniel; McConville, Greg

doi:10.1016/j.apenergy.2019.114349

Cited by 16 publications

(14 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Turbochargers can make significant contributions to overall engine performance. Turbocharger for diesel engines was used for the purpose to increase both power density 8 and efficiency 9 . A turbocharger turbine converts thermal energy from exhausted gas to mechanical energy and drives the compressor.…”

Section: Introductionmentioning

confidence: 99%

Engine performance improvements through turbocharger matching and turbine design

Chen

Zhang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

It is interesting to improve engine system performance with turbocharger technologies. In this study, a systematic simulation for engine and turbocharger matching to provide full utilization of the turbocharger potential and improve the engine performance without sacrificing the emission is developed. A velocity ratio concept was proposed to count the turbocharger performance impacts due to the diameter ratio of compressor and turbine wheels. A design of experiments was used to optimize the turbocharger and engine performance for different turbocharger factors. A better‐matched turbocharger was obtained. A multidisciplinary optimization method was used to design a mixed flow turbine wheel to reduce the turbine velocity ratio at peak efficiency and increase the overall turbocharger efficiency. Results showed that about 0.4% torque improvements and 1.2% reductions in the engine brake‐specific fuel consumption were obtained without making any other changes to the engine. This study demonstrated that systematic simulations for engine systems and considering turbocharger wheel diameter ratio effects could further improve the turbocharged engine system matching and the engine performance.

show abstract

Section: Introductionmentioning

confidence: 99%

Engine performance improvements through turbocharger matching and turbine design

Chen

Zhang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…Mezher et al, 12 Avola et al 13 developed a zero-dimensional acoustic model to investigate the effect of the geometrical parameters of the intake manifold at low-end torque conditions. Reihani et al 14 revealed a positive impact of the integration of low-pressure recirculation devices on further enhancing turbine and ICE performances. Liu et al 15 developed a secondary flow injection system as a novel turbo-compounding technology within the turbine.…”

Section: Introductionmentioning

confidence: 99%

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Ketata

Driss

2022

International Journal of Engine Research

View full text Add to dashboard Cite

The turbine, an enabling component of turbochargers, is a seat of highly complex unsteady flow as well as varying gas compositions between diesel and gasoline engines. Thus, it is necessary to take into account different physical models when simulating such turbines. Researchers have often considered the turbine working gas as air, which may not lead to an accurate prediction of actual turbine characteristics. In the present work, the effect of the working gas on the performance of turbocharger turbines as well as on the turbo lag was investigated through a set of numerical simulations for six wastegate opening degrees from 0% up to 100% and under a wide range of the flow pulse frequency ranging from 33.33 up to 166.66 Hz. Four working fluids were involved in this study which are the gasoline burnt gas, diesel burnt gas, air with like gasoline engine waves, and air with like diesel engine waves. The performance of the turbine and its responsiveness quantified as the time lag with burnt gases from both diesel and gasoline engines were compared to those with air. Results showed totally deviated unsteady performance characteristics compared to the turbine working with air. Results also confirmed that considering the working fluid as air may not lead to a fair representation of the actual turbine performance characteristics. The findings of this work put emphasis on the importance of the gas composition when modeling such turbines by engineers especially during the design process where a good turbocharger-engine match has to be met.

show abstract

“…On the one hand, Reihani et al 26 found a decrease in compressor pressure ratio and efficiency up to 3% and 25% correspondingly when introducing LP-EGR, and Guilain et al 27 noticed a reduction of 1.7% of compressor isentropic efficiency for the junction that reduced condensation the most. On the other hand, Galindo et al 28 did not found significant differences between the compressor with a LP-EGR junction and the reference straight duct with an equivalent working point.…”

Section: Introductionmentioning

confidence: 99%

Influence of the low-pressure exhaust gas recirculation injection point on engine performance

Galindo

Navarro

Morena

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

The use of low-pressure exhaust gas recirculation (EGR) has been extended in spark-ignited engines in recent years due to advantages from efficiency perspective. However, the potential condensation of the water contained in the exhaust gases and eventual compressor erosion can limit the usage of such systems during engine warm-up and/or cold ambient conditions. One possibility to avoid condensation at cold ambient is to place the EGR injection close to the compressor wheel, avoiding a complete mixture of both streams, but it alters the flow distribution upstream of the compressor, potentially affecting its performance. In order to assess the impact of this phenomenon in engine operation, a detailed experimental campaign in a state-of-the-art spark-ignition engine was performed comparing this close-coupled configuration with another one where the injection point was far upstream the compressor, ensuring a perfect mixing. A previously developed and validated one-dimensional model of the variable geometry turbocharger was used to analyze in further detail the compressor and turbine operation. The results show a general deterioration of the engine pumping mean effective pressure (up to 0.02 bar) and the specific fuel consumption (up to 4 g/kWh) when applying the close configuration, higher as the EGR rate increases, which is partially due to the change in turbine operation induced by the new compressor working point.

show abstract

Experimental response surface study of the effects of low-pressure exhaust gas recirculation mixing on turbocharger compressor performance

Cited by 16 publications

References 29 publications

Engine performance improvements through turbocharger matching and turbine design

Engine performance improvements through turbocharger matching and turbine design

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Influence of the low-pressure exhaust gas recirculation injection point on engine performance

Contact Info

Product

Resources

About