Effect of the Injection Method in DI CNG Engine on the Flame Propagation Process and Engine Performance

2012 ◽  
pp. 157-169 ◽  
Author(s):  
Xuedong Lin ◽  
Fang-en Yuan ◽  
Ya Huang
Keyword(s):  
Flame Propagation ◽  
Engine Performance ◽  
Propagation Process ◽  
Injection Method ◽  
Cng Engine

scholarly journals Simulation of performance and nitrogen oxide formation of a hydrogen-enriched diesel engine with the steam injection method

2015 ◽  
Vol 19 (6) ◽  
pp. 1985-1994 ◽  
Author(s):  
Guven Gonca ◽  
Bahri Sahin
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Steam Injection ◽  
Combustion Model ◽  
Enrichment Method ◽  
Injection Method ◽  
Positive Effects ◽  
Effective Efficiency ◽  
Hydrogen Enrichment ◽  
No Emissions

In the present study, steam injection method (SIM) is implemented to a hydrogen-enriched diesel engine in order to improve the levels of performance and NO emissions. As hydrogen enrichment method increases effective efficiency, NO emissions could be increased. However, the SIM is used to control NO emissions and improve the engine performance. Due to these positive effects, hydrogen enrichment and the SIM)are applied into a diesel engine by using a two-zone combustion model for30% hydrogen enrichment of the fuel volume and 20% steam ratio of the fuel mass at full load conditions. The results obtained are compared with conventional diesel engine (D), steam injected diesel engine (D+S20), hydrogen-enriched diesel engine (D+H30) and hydrogen-enriched diesel engine with steam injection (D+H30+S20) in terms of performance and NO emissions. In the results, the effective efficiency and effective power improve up to 22.8% and %3.1, as NO emissions decrease up to 22.1%. Hence, the hydrogen enrichment with steam injection method is more environmentally friendly with better performance.

scholarly journals Effect of Spark Advance on a Gas Run Automotive Spark Ignition Engine

2010 ◽  
pp. 42-49 ◽  
Author(s):  
Md Ehsan
Keyword(s):  
Natural Gas ◽  
Flame Propagation ◽  
Chemical Engineering ◽  
Engine Performance ◽  
Spark Ignition ◽  
Constant Load ◽  
Combustion Characteristics ◽  
Spark Ignition Engine ◽  
Optimum Performance ◽  
Automotive Engine

Petrol engines can run on natural gas, with little modification. The combustion characteristics of naturalgas is different from that of petrol, which eventually affects the engine performance. The performance of atypical automotive engine was studied running on natural gas, firstly at a constant speed for various loadsand then at a constant load for a range of speeds and results were compared with performance using petrol.Variation of the spark advance, consisting of centrifugal and vacuum advance mechanisms, wasinvestigated. Results showed some reduction in power and slight fall of efficiency and higher exhausttemperature, for natural gas. The air-fuel ratio for optimum performance was higher for gas than for petrol.This variation in spark requirement is mainly due to the slower speed of flame propagation for natural gas.For both the cases, the best power spark advance for natural gas was found to have higher values thanpetrol. This issue needs to be addressed during retrofitting petrol engines for running on natural gas.Journal of Chemical Engineering Vol.ChE 24 2006 42-49

327 Development of Non-eccentric Rotor IC Engine : Optical Observations of Ignition and Flame Propagation Process

2014 ◽  
Vol 2014.63 (0) ◽  
pp. _327-1_-_327-2_
Author(s):  
Yu SAKAI ◽  
Keisuke TESHIMA ◽  
Hiroyuki FUJII ◽  
Yusaku YAMAMOTO ◽  
Yu SAIKI ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Optical Observations ◽  
Propagation Process ◽  
Ic Engine ◽  
Eccentric Rotor

scholarly journals Control-oriented analysis of a lean-burn light-duty natural gas research engine with scavenged pre-chamber ignition

2019 ◽  
Vol 176 (1) ◽  
pp. 42-53
Author(s):  
Severin HÄNGGI ◽  
Thomas HILFIKER ◽  
Patrik SOLTIC ◽  
Richard HUTTER ◽  
Christopher ONDER
Keyword(s):  
Natural Gas ◽  
Control Structure ◽  
Engine Performance ◽  
Combustion Stability ◽  
Performance Criteria ◽  
Transport Sector ◽  
Lean Burn ◽  
Fuel Ratio ◽  
Cng Engine ◽  
Lean Conditions

Natural gas is well-suited as a fuel in the transport sector. Due to its excellent combustion characteristics, engines operating with compressed natural gas (CNG) reach high efficiency, especially if operated at lean conditions. However, CNG engine research mainly focusses on stoichiometric conditions in order to use a three-way catalytic converter for the exhaust gas after treatment system. With the objective to explore the potential of CNG engines operated at lean conditions, a turbo-charged CNG engine with high com-pression ratio is developed and optimized for lean operation. In order to increase the ignition energy, the CNG engine is equipped with scavenged pre-chambers. A specific control structure is developed, which allows to operate the engine at a pre-defined (lean) air-to-fuel ratio. Further functionalities such as the combustion placement control and algorithms to estimate the conditions inside of the pre-chamber are implemented. The first part of this paper describes this engine control structure, which is specifically developed for the lean-burn CNG engine. In the second part, the effects of pre-chamber scavenging on engine performance criteria such as the combustion stability, engine efficiency or engine emissions are analyzed. With the objective to use pre-chamber scavenging to improve engine performance, a scavenging feed-back control strategy is proposed. In order to control the ignition delay, this strategy adapts the amount of CNG injected into the pre-chamber with a linear controller or an extremum seeking algorithm depending on the air-to-fuel ratio of the main chamber.

Simulation Study about Dual Spark Plug Position for the CNG Engine Combustion Process

2013 ◽  
Vol 712-715 ◽  
pp. 1197-1200 ◽  
Author(s):  
Chang Qing Song ◽  
Jun Li ◽  
Da Wei Qu ◽  
Kai Yu
Keyword(s):  
Flame Propagation ◽  
Combustion Process ◽  
Three Dimensional ◽  
Propagation Distance ◽  
Simulation Software ◽  
Flame Surface ◽  
Flame Kernel ◽  
Spark Plug ◽  
Cng Engine ◽  
Combustion Speed

The paper has modeled and simulated the combustion process of big bore CNG engine by three-dimensional simulation software AVL FRIE. Based on test validation in the model, the effect on position of the dual spark plug for cylinder initial flame kernel development and flame propagation process was researched. The results showed that: When A=0.5, the flame propagation distance shortened by half, a certain intensity of turbulence formed when the compression stroke ended, the combustion speed was the fastest, the combustion duration was the shortest. If dual spark plug spacing is too small, the two flames meet prematurely will cause interfere with each other, and reduce the combustion speed of the overlapping region of the flame surface, increase the heat losses. Otherwise,if the distance is too large , close to the combustion chamber wall, the combustion space is narrow, the flame propagation space is restricted, then flame development is slow.

The Effect of Tumble Flow on Engine Performance and Flame Propagation

1993 ◽  
Author(s):  
Myoung-Seok Jie ◽  
Myong-Ho Kim ◽  
Woo-Tae Kim
Keyword(s):  
Flame Propagation ◽  
Engine Performance
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