Measurements of laminar flame speeds and flame instability analysis of E30-air premixed flames at elevated temperatures and pressures

•Laminar flame speeds of E30-air mixture were measured.•Effects of temperature, pressure and dilution on laminar flame characteristics of E30 were studied.•Regardless of temperature, pressure and dilution, the flame speeds peaks at the equivalence ratio of 1.1.•Temperature and dilution shows an oppo...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Fuel (Guildford) 2020-01, Vol.259 (C), p.116223, Article 116223
Hauptverfasser: Yang, Qing, Liu, Zechang, Hou, Xinghe, He, Xu, Sjöberg, Magnus, Vuilleumier, David, Liu, Cong, Liu, Fushui
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:•Laminar flame speeds of E30-air mixture were measured.•Effects of temperature, pressure and dilution on laminar flame characteristics of E30 were studied.•Regardless of temperature, pressure and dilution, the flame speeds peaks at the equivalence ratio of 1.1.•Temperature and dilution shows an opposite effect on flame stability of lean and rich mixtures.•Laminar burning velocity of E30 was significantly promoted compared to gasoline and E10. Ethanol is regarded as one of the most promising alternative renewable fuels and as well as an oxygenate blending component in gasoline fuels, with widespread usage in many countries around the world. Laminar flame speeds can have strong influence on the stability and operability of Spark-Ignition combustion in certain operating regimes, and so the effects of different initial conditions on laminar combustion characteristics of E30 (gasoline blended with ethanol of 30% liquid volume) were analyzed in a constant-volume combustion vessel using the high-speed Schlieren method. This work presents results for equivalence ratios of 0.7–1.4, dilution ratios of 0%, 5%, 10%, and at different initial temperatures (408, 453 and 498 K) and initial pressures (1, 2 and 3 bar). It can be concluded that the laminar burning velocity has a positive correlation with initial temperature, but negative correlation with initial pressure and dilution ratio. The laminar burning velocity always reaches its maximum value at an equivalence ratio of 1.1 and does not change with varying initial conditions' the adiabatic flame temperature displays a similar variation with the initial conditions. The flame instability of E30-air mixture is enhanced as the initial pressure increases. Flame stability at lean and rich mixtures are exactly opposite at different initial temperature and dilution ratio. The laminar burning velocity was significantly promoted relative to gasoline and E10 by the addition of higher volume fractions of ethanol, highlighting one of the benefits of ethanol’s use as a blending component in gasoline fuels.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2019.116223