Ultra-Lean operating conditions have a great potential toward the increase of engine thermal efficiency and control of pollutant emissions in Internal Combustion Engines; however, cyclic variability and stability are still critical issues to be solved. The use of natural gas may partially solve these issues due to a more efficient mixing process, widening the flammability limits. An analysis of natural gas ultra-lean combustion process is presented in this work using local charge stratification to stabilize the process. In particular, the predictive capabilities of the numerical model are here validated up to ultra-lean (λ=2.0) mixtures. Moreover, an analysis of the ignition timing has been performed, to find the optimal trade-off between flame quenching and turbulent kinetic energy decay as produced by the jet in the vicinity of the spark location. The optimal ignition timing has been calculated in the range of 5ms.

Bartolucci, L., Cordiner, S., Mulone, V., & Rocco, V. (2016). Natural Gas Stable Combustion under Ultra-Lean Operating Conditions in Internal Combustion Engines. ENERGY PROCEDIA, 101, 886-892 [10.1016/j.egypro.2016.11.112].

Natural Gas Stable Combustion under Ultra-Lean Operating Conditions in Internal Combustion Engines

BARTOLUCCI, LORENZO;CORDINER, STEFANO;MULONE, VINCENZO;ROCCO, VITTORIO
2016

Abstract

Ultra-Lean operating conditions have a great potential toward the increase of engine thermal efficiency and control of pollutant emissions in Internal Combustion Engines; however, cyclic variability and stability are still critical issues to be solved. The use of natural gas may partially solve these issues due to a more efficient mixing process, widening the flammability limits. An analysis of natural gas ultra-lean combustion process is presented in this work using local charge stratification to stabilize the process. In particular, the predictive capabilities of the numerical model are here validated up to ultra-lean (λ=2.0) mixtures. Moreover, an analysis of the ignition timing has been performed, to find the optimal trade-off between flame quenching and turbulent kinetic energy decay as produced by the jet in the vicinity of the spark location. The optimal ignition timing has been calculated in the range of 5ms.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/08 - Macchine a Fluido
English
Partially Stratified Charge Spark Ignition; Turbulent Combustion; Inhomogeneous Combustion; Injection and Combustion Modelling.
Bartolucci, L., Cordiner, S., Mulone, V., & Rocco, V. (2016). Natural Gas Stable Combustion under Ultra-Lean Operating Conditions in Internal Combustion Engines. ENERGY PROCEDIA, 101, 886-892 [10.1016/j.egypro.2016.11.112].
Bartolucci, L; Cordiner, S; Mulone, V; Rocco, V
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/181081
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