scholarly journals Large-eddy simulation of dual-fuel spray ignition at different ambient temperatures

2020 ◽  
Vol 215 ◽  
pp. 51-65 ◽  
Author(s):  
Bulut Tekgül ◽  
Heikki Kahila ◽  
Ossi Kaario ◽  
Ville Vuorinen
Keyword(s):  
Large Eddy Simulation ◽  
Fuel Spray ◽  
Dual Fuel ◽  
Ambient Temperatures ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Effects of ambient methanol on pollutants formation in dual-fuel spray combustion at varying ambient temperatures: A large-eddy simulation

2020 ◽  
Vol 279 ◽  
pp. 115774 ◽  
Author(s):  
Shijie Xu ◽  
Shenghui Zhong ◽  
Kar Mun Pang ◽  
Senbin Yu ◽  
Mehdi Jangi ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Fuel Spray ◽  
Spray Combustion ◽  
Dual Fuel ◽  
Ambient Temperatures ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Large-eddy simulation of the injection timing effects on the dual-fuel spray flame

Fuel ◽  
2021 ◽  
pp. 122445
Author(s):  
Shijie Xu ◽  
Shenghui Zhong ◽  
Ahmad Hadadpour ◽  
Yan Zhang ◽  
Kar Mun Pang ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Fuel Spray ◽  
Dual Fuel ◽  
Injection Timing ◽  
Eddy Simulation ◽  
Spray Flame ◽  
Large Eddy ◽  
Timing Effects

scholarly journals Large eddy simulation of diesel spray–assisted dual-fuel ignition: A comparative study on two n-dodecane mechanisms at different ambient temperatures

2020 ◽  
pp. 146808742094655
Author(s):  
Jeevananthan Kannan ◽  
Mahmoud Gadalla ◽  
Bulut Tekgül ◽  
Shervin Karimkashi ◽  
Ossi Kaario ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Three Dimensional ◽  
High Reactivity ◽  
Dual Fuel ◽  
Ignition Process ◽  
Ambient Temperatures ◽  
Chemical Mechanisms ◽  
Eddy Simulation ◽  
Reduced Mechanism ◽  
Large Eddy

In dual-fuel compression ignition engines, a high-reactivity fuel, such as diesel, is directly injected to the engine cylinder to ignite a mixture of low-reactivity fuel and air. This study targets improving the general understanding on the dual-fuel ignition phenomenon using zero-dimensional homogeneous reactor studies and three-dimensional large eddy simulation together with finite-rate chemistry. Using the large eddy simulation framework, n-dodecane liquid spray is injected into the lean ambient methane–air mixture at [Formula: see text]. The injection conditions have a close relevance to the Engine Combustion Network Spray A setup. Here, we assess the effect of two different chemical mechanisms on ignition characteristics: a skeletal mechanism with 54 species and 269 reaction steps (Yao mechanism) and a reduced mechanism with 96 species and 993 reaction steps (Polimi mechanism). Altogether three ambient temperatures are considered: 900, 950, and 1000 K. Longer ignition delay time is observed in three-dimensional large eddy simulation spray cases compared to zero-dimensional homogeneous reactors, due to the time needed for fuel mixing in three-dimensional large eddy simulation sprays. Although ignition is advanced with the higher ambient temperature using both chemical mechanisms, the ignition process is faster with the Polimi mechanism compared to the Yao mechanism. The reasons for differences in ignition timing with the two mechanisms are discussed using the zero-dimensional and three-dimensional large eddy simulation data. Finally, heat release modes are compared in three-dimensional large eddy simulation according to low- and high-temperature chemistry in dual-fuel combustion at different ambient temperatures. It is found that Yao mechanism overpredicts the first-stage ignition compared to Polimi mechanism, which leads to the delayed second-stage ignition in Yao cases compared to Polimi cases. However, the differences in dual-fuel ignition for Polimi and Yao mechanisms are relatively smaller at higher ambient temperatures.

scholarly journals Large Eddy Simulation of CO 2 diluted oxy-fuel spray flames

Fuel ◽  
2017 ◽  
Vol 201 ◽  
pp. 165-175 ◽  
Author(s):  
Likun Ma ◽  
Xu Huang ◽  
Dirk Roekaerts
Keyword(s):  
Large Eddy Simulation ◽  
Fuel Spray ◽  
Eddy Simulation ◽  
Spray Flames ◽  
Large Eddy

LES of Contrails With Ice Habit Treatment Using the Fickian-Distribution Model

2014 ◽  
Author(s):  
Aniket R. Inamdar ◽  
Sanjiva K. Lele ◽  
Mark Z. Jacobson
Keyword(s):  
Crystal Growth ◽  
Large Eddy Simulation ◽  
Laboratory Data ◽  
Distribution Model ◽  
Ice Crystal ◽  
Ambient Temperatures ◽  
Eddy Simulation ◽  
Large Eddy ◽  
In Situ Observations

This study uses a Fickian-Distribution parameterization [Chen & Lamb, 1994] to model the effects of ice habits on contrail formation within a large eddy simulation (LES). Box model cases were first performed at various ambient temperatures and relative humidities over ice (RHi) and results compared with available laboratory data of ice crystal growth and habit distribution [Bailey & Hallett, 2004]. The model was then used in a full 3-D LES of contrails and results were compared with in-situ observations [Febvre et. al., 2009]. Comparisons are also made with results from simulations that used a probabilistic ice habit model [Inamdar et. al., 2013].

LARGE EDDY SIMULATION OF FUEL-SPRAY UNDER NON-REACTING IC ENGINE CONDITIONS

2013 ◽  
Vol 23 (10) ◽  
pp. 925-955 ◽  
Author(s):  
Qingluan Xue ◽  
Sibendu Som ◽  
Peter K. Senecal ◽  
E. Pomraning
Keyword(s):  
Large Eddy Simulation ◽  
Fuel Spray ◽  
Ic Engine ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Large-eddy simulation of spray assisted dual-fuel ignition under reactivity-controlled dynamic conditions

Fuel ◽  
2021 ◽  
Vol 293 ◽  
pp. 120295
Author(s):  
Bulut Tekgül ◽  
Heikki Kahila ◽  
Shervin Karimkashi ◽  
Ossi Kaario ◽  
Zeeshan Ahmad ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Dual Fuel ◽  
Dynamic Conditions ◽  
Eddy Simulation ◽  
Large Eddy
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