Impact of injection settings operating with the gasoline Partially Premixed Combustion concept in a 2-stroke HSDI compression ignition engine

Benajes, Jesús; Lima, Daniela de Freitas; Thein, Kevin

doi:10.1016/j.apenergy.2017.02.044

Cited by 13 publications

(14 citation statements)

References 39 publications

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“…In a recent research developed at Universitat Politècnica de València [ [75][76][77][78][79][80][81][82], it appears that an innovative 2-stroke high speed direct injection (HSDI) CI engine could represent a promising solution to control the combustion timing and to extend the load range [83]. Indeed, as proven by these investigations, the ability of this engine to control the cylinder conditions through the air management settings, allows to fix the local fuel concentration at the start of combustion.…”

Section: Phenomenological Description Of the CI Combustion | 13mentioning

confidence: 99%

“…This means that it is possible to keep the local equivalence ratios in the most reactive band, so as to avoid the production of soot precursors while ensuring combustion efficiency and stability [79][80][81]. However, by delaying the combustion start, the increased HC and CO amounts in the exhaust cause important efficiency losses of the combustion process and this evidences a new trade-off between combustion efficiency and NO x -soot emissions [80][81][82].…”

Section: Phenomenological Description Of the CI Combustion | 13mentioning

confidence: 99%

“…Therefore, current research efforts are focused on reducing the overall combustion noise levels [47,85,86] and improving the sound quality of the engine noise [23,48,87,88]. However, research on combustion acoustics of this particular concept is very limited and only a few authors included noise analysis in their works [81,82].…”

Section: Phenomenological Description Of the CI Combustion | 13mentioning

confidence: 99%

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Computational assessment of combustion noise of automotive compression-ignited engines

Soriano¹

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derstanding the unsteady pressure field inside combustion chambers of compression ignition engines using a CFD approach". International J of Engine Research (available on-line), 2018. I would like to record my sincere gratitude to my advisor Prof. Alberto Broatch for his guidance and support during the chase of this research. A gratitude that also must be extended to Prof. Payri and Prof. Desantes on behalf of CMT-Motores Térmicos and Universitat Politècnica de València for offering me the chance to become part of this research group during these four years. I owe my most special thanks to Prof. Ricardo Novella for his advice and invaluable help in the most difficult moments but especially for the good ones we shared during the fruitless lunchtime discussions, sports sessions... I just can say, moltes gràcies per tot Rick.

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Section: Phenomenological Description Of the CI Combustion | 13mentioning

confidence: 99%

Section: Phenomenological Description Of the CI Combustion | 13mentioning

confidence: 99%

Section: Phenomenological Description Of the CI Combustion | 13mentioning

confidence: 99%

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Computational assessment of combustion noise of automotive compression-ignited engines

Soriano¹

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“…Coupled with appropriate turbulence models, Kodavasal et al [43] demonstrated that a similar combustion approach allows an accurate reproduction of gasoline autoignition, while other researchers [29,44] established realistic rates of heat release under gasoline compression-ignited conditions. The fuel injection was described by the standard Discrete Droplet Model (DDM) [45] and Kelvin Helmholtz (KH)-Rayleigh Taylor (RT) breakup model was employed to model spray atomization [46].…”

Section: Numerical Model Set-upmentioning

confidence: 99%

Computational Methodology for Knocking Combustion Analysis in Compression-Ignited Advanced Concepts

2018

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In the present work, a numerical methodology based on three-dimensional (3D) computational fluid dynamics (CFD) was developed to predict knock in a 2-Stroke engine operating with gasoline Partially Premixed Combustion (PPC) concept. Single-cycle Unsteady Reynolds-Averaged Navier Stokes (URANS) simulations using the renormalization group (RNG) k − ε model were performed in parallel while the initial conditions are accordingly perturbed in order to imitate the variability in the in-cylinder conditions due to engine operation. Results showed a good agreement between experiment and CFD simulation with respect to cycle-averaged and deviation of the ignition timing, combustion phasing, peak pressure magnitude and location. Moreover, the numerical method was also demonstrated to be capable of predicting knock features, such as maximum pressure rise rate and knock intensity, with good accuracy. Finally, the CFD solution allowed to give more insight about in-cylinder processes that lead to the knocking combustion and its subsequent effects.In particular, PPC operated with low reacting fuels, such as gasoline, have shown encouraging results to achieve very low pollutant emissions while maintaining, or even improving, the thermal efficiency [10][11][12]. Indeed, this combustion concept operated in an innovative 2-Stroke high speed direct injection (HSDI) compression-ignited (CI) engine [13] offers a good flexibility to control the combustion timing and to extent the load range [14][15][16].This concept operates between completely premixed and fully diffusive conditions, whereby low pollutant emissions may be attained. However, to achieve these conditions while retaining an accurate combustion timing control with the injection event remains as the main drawback of this particular system when operating under transient conditions.Despite the attractive benefits of this engine system, its complexity due to the large number of parameters to be managed requires the use of optimization techniques which ensure greater flexibility, speed and lower costs than purely experimental procedures.In this framework, the use of computational fluid dynamics (CFD) simulations is nowadays widely established in both the research community and the automotive industry. Here, aspects such as the simulation of turbulence and how it couples with the chemistry [17] are still the main limiting factors for reproducing the reacting flow field accurately. Since the requirements in both fields tend to differ, specially in terms of time available, the approaches used are also usually different. While in the industry sector, simulations are based on Unsteady Reynolds-averaged Navier-Stokes (URANS) turbulence modelling [18,19] and flamelet-based combustion models [20] owing its lower computational demands, the research community prefer to resort to high-fidelity combustion models and more complex turbulence schemes such as Large Eddy Simulations (LES) [21] or Direct Numerical Simulations (DNS) [22].Although the industry standard tends to simplify the simulatio...

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“…In previous work and specifically in this engine, the effects of injection parameters on engine performance and exhaust emissions were analyzed. 28,29 Therefore, with the aim of continuing to explore the PPC concept, the focus of this research is exclusively on the analysis of air management. Moreover, the main reason for selecting these operation modes is due to the possibility of evaluating the behavior of the particles in both structures of the size distribution.…”

Section: Test Schedulementioning

confidence: 99%

Assessment of air management strategies on particulate number and size distributions from a 2-stroke compression-ignition engine operating with gasoline Partially Premixed Combustion concept

Bermúdez

Ruíz

Novella

et al. 2018

International Journal of Engine Research

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Bermúdez, V.; Ruiz, S.; Novella Rosa, R.; Soto-Izquierdo, L. (2018). Assessment of air management strategies on particulate number and size distributions from a 2-stroke compression-ignition engine operating with gasoline Partially Premixed Combustion concept. AbstractThe newly designed Partially Premixed Combustion (PPC) concept has demonstrated its potential to reduce NOx and particulate matter (PM) emissions combined with highly indicated efficiencies. However, it is highly dependent of the ignition characteristics of the fuel and the air/fuel mixture preparation. Therefore, the proper selection of an injection strategy, of the combustion chamber design and of the air management strategy are critical to ensuring successful PPC operation in the full engine map. The objective of the present investigation consists of evaluating the use of multiple air management strategies over the air/fuel effective equivalence ratio (ɸ eff ) and cylinder charge reactivity and its consequent impact on particle number (PN) emissions and particle size distribution. Tests were carried out in a newly designed 2-stroke HSDI CI engine operating with PPC concept using 95 Research Octane Number (RON) gasoline fuel. A Scanning Particle Sizer (SMPS) was used to measure the size distribution of engine-exhaust particles in the range from 6.3 to 237 nm. Three different steady-state operation modes in terms of indicated mean effective pressure (IMEP) and engine speed were investigated. The experiments showed an increase in PN emissions and a progressive shift in the particles size towards larger sizes, increasing the accumulation-mode particles and reducing the nucleation-mode particles with the decreasing of the differential pressure between intake and exhaust (ΔP) and the valve overlap (OLAP) period. Finally, the particle formation process was limited by the increase in the EGR rate.

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Impact of injection settings operating with the gasoline Partially Premixed Combustion concept in a 2-stroke HSDI compression ignition engine

Cited by 13 publications

References 39 publications

Computational assessment of combustion noise of automotive compression-ignited engines

Computational assessment of combustion noise of automotive compression-ignited engines

Computational Methodology for Knocking Combustion Analysis in Compression-Ignited Advanced Concepts

Assessment of air management strategies on particulate number and size distributions from a 2-stroke compression-ignition engine operating with gasoline Partially Premixed Combustion concept

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