Development of a Late Intake-Valve Closing (LIVC) Miller Cycle for Stationary Natural Gas Engines - Effect of EGR Utilization

Natural gas (NG) is one of the most promising alternative fuels of diesel and petrol because of its economics and environmental protection. Generally the NG engine share the similar structure profile with diesel or petrol engine but the combustion characteristics of NG is varied from the fuels, so the investigation of NG engine combustion process receive more attentions from the researchers. In this paper, a zero-dimensional model on the basis of Vibe function is built in the MATLAB/SIMULINK environment. The model provides the prediction of combustion process in natural gas engines, which has been verified by the experimental data in the NG test bed. Furthermore, the influence of NG composition on engine performance is investigated, in which the in-cylinder maximum pressure and temperature and mean indicated pressure are compared using different type NG. It is shown in the results that NG with higher composition of methane results in lower maximum temperature and mean indicated pressure as well as higher maximum pressure.

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Effect of water vapor on the activity and stability of Pd/SZ and Co/ZrO2 in dual-catalyst treatment of simulated exhaust from lean-burn natural gas engines

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2010.02.040 ◽

2010 ◽

Vol 96 (3-4) ◽

pp. 421-433 ◽

Cited By ~ 15

Author(s):

Burcu Mirkelamoglu ◽

Umit S. Ozkan

Keyword(s):

Water Vapor ◽

Natural Gas ◽

Lean Burn ◽

Natural Gas Engines ◽

Effect Of Water

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Advantages of the unscavenged pre-chamber ignition system in turbocharged natural gas engines for automotive applications

Energy ◽

10.1016/j.energy.2020.119466 ◽

2021 ◽

Vol 218 ◽

pp. 119466

Author(s):

J.J. López ◽

R. Novella ◽

J. Gomez-Soriano ◽

P.J. Martinez-Hernandiz ◽

F. Rampanarivo ◽

...

Keyword(s):

Natural Gas ◽

Automotive Applications ◽

Ignition System ◽

Natural Gas Engines

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Transient Behavior of Glow Plugs in Direct-Injection Natural Gas Engines

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4006692 ◽

2012 ◽

Vol 134 (9) ◽

Cited By ~ 12

Author(s):

Stewart Xu Cheng ◽

James S. Wallace

Keyword(s):

Heat Transfer ◽

Natural Gas ◽

Direct Injection ◽

High Surface ◽

Cold Start ◽

Transfer Model ◽

Ignition Process ◽

Computational Domain ◽

Glow Plug ◽

Natural Gas Engines

Glow plugs are a possible ignition source for direct injected natural gas engines. This ignition assistance application is much different than the cold start assist function for which most glow plugs have been designed. In the cold start application, the glow plug is simply heating the air in the cylinder. In the cycle-by-cycle ignition assist application, the glow plug needs to achieve high surface temperatures at specific times in the engine cycle to provide a localized source of ignition. Whereas a simple lumped heat capacitance model is a satisfactory representation of the glow plug for the air heating situation, a much more complex situation exists for hot surface ignition. Simple measurements and theoretical analysis show that the thickness of the heat penetration layer is small within the time scale of the ignition preparation period (1–2 ms). The experiments and analysis were used to develop a discretized representation of the glow plug domain. A simplified heat transfer model, incorporating both convection and radiation losses, was developed for the discretized representation to compute heat transfer to and from the surrounding gas. A scheme for coupling the glow plug model to the surrounding gas computational domain in the KIVA-3V engine simulation code was also developed. The glow plug model successfully simulates the natural gas ignition process for a direct-injection natural gas engine. As well, it can provide detailed information on the local glow plug surface temperature distribution, which can aid in the design of more reliable glow plugs.

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