A Comprehensive Numerical Study on Effects of Natural Gas Composition on the Operation of an HCCI Engine

Jahanian, Omid; Jazayeri, Seyed Ali

doi:10.2516/ogst/2011133

Cited by 17 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For direct injection engines, the instantaneous mass fraction of the in-cylinder air can be calculated by using Eq (6). The two terms of the numerator of the right-hand side represent the initial air mass and accumulated burnt air.…”

Section: Mass Balance and Compositionmentioning

confidence: 99%

“…As the fuel composition plays a key role in determining the fuel thermodynamic properties (heating value, specific energy, specific heat, etc. ), the fuel composition variation significantly affects the engine performance [6] and emissions [5]. In this respect, the investigation of the fuel interchangeability between gaseous fuels in combustion engines is a topic of great importance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on gaseous fuels interchangeability with an extended zero-dimensional engine model

Xiang

Theotokatos

Ding

2019

Energy Conversion and Management

View full text Add to dashboard Cite

As the gaseous fuels interchangeability, which requires that the two gaseous fuels must be nearly identical in terms of their combustion characteristics and result in a similar engine performance, is important for internal combustion engines operation in cases of the fuel composition variation or the main fuel supply failure. In such cases, simulation tools of sufficient accuracy can be effectively employed in fuel interchangeability studies as well as for predicting the engine performance and emissions. In this study, a zero-dimensional diesel engine model is extended for simulating multi-fuel engines by considering the thermodynamic properties of the employed fuels. The model is verified against experimental data and subsequently employed to investigate the performance and knocking resistance of an SI engine operating with interchanged gaseous fuels mixtures. The derived results demonstrate that the Wobbe Index estimation is not sufficient for the characterisation of the engine performance and therefore simulation must be used for the accurate engine performance prediction with fuels interchangeability. The addition of either carbon dioxide or nitrogen results in reducing the knocking probability and retarding the knocking onset crank angle. It is inferred that the carbon dioxide addition is more effective than the nitrogen addition and concluded that the proposed model for multi-fuel engines provides results of sufficient accuracy to investigate the fuel interchangeability influence on the engine performance and knocking resistance.

show abstract

Section: Mass Balance and Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on gaseous fuels interchangeability with an extended zero-dimensional engine model

Xiang

Theotokatos

Ding

2019

Energy Conversion and Management

View full text Add to dashboard Cite

show abstract

“…Karavalakis et al [16] investigated the implications of natural gas composition on the gaseous pollutants, fuel economy, and the engine power output of two light-duty vehicles operated over different driving cycles. The results of their study showed that for modern light-duty NGVs, fuel properties have a clear and direct impact on fuel economy and some emissions components, such as CO2 and NMHC, but not for other emission components, such as THC, NOx, and CO. Jahanian and Jazayeri [17] studied the influence of natural gas composition on engine operation in HCCI mode. Six different compositions of natural gas have been considered to study the engine performance via a thermo-kinetic zero-dimensional model.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Influence of Natural Gas Composition on the Performance of a CNG Engine

Kakaee¹,

Karimi²

2018

MJMIE

View full text Add to dashboard Cite

Natural gas is the cleanest fossil fuel and it has high energy conversion efficiencies for power generation in internal combustion engines. Natural gases have varying composition depending on the place where they are produced. This paper studies the effects of natural gas composition on the combustion and emissions characteristics of CNG engines and presents the overall combustion characteristics obtained from running a 1.65 L, 4-cylinder EF 7 CNG engine. Engine power, Torque, BMEP and BSFC were measured under steady state operation conditions at full load conditions. The obtained simulation results were compared with experimental ones in the literature and showed that the CNG composition had a considerable influence on engine performance and fuel economy. A correlation has been proposed to help gain insight into the relationship between the Methane Number (MN) and engine power, and it provides a practical method for estimating the engine power when the composition of natural gases varies.

show abstract

“…Many researchers working on the natural gas engines demonstrated that natural gas composition significantly affects engine performance and emissions. It was also reported that the heating value (HV), thermal efficiency, and concentration of un-burnt hydrocarbon (UHC) and other emission particles would highly depend on the source of supply of natural gas as the main fuel [34,35]. under given inlet conditions.…”

Section: Fuel Composition Effectsmentioning

confidence: 99%

Investigation of Combustion Phenomena in a Single-Cylinder Spark-Ignited Natural Gas Engine with Optical Access

Padmanaban¹

View full text Add to dashboard Cite

More demanding efficiency and emissions standards for internal combustion (IC) engines require novel combustion strategies, alternative fuels, and improved after-treatment systems. However, their development depends on improved understanding of in-cylinder processes. For example, the lower efficiency of conventional spark-ignited (SI) natural-gas (NG) engines reduces their utilization in the transportation sector. Single-cylinder optical-access research engines allow the use of non-intrusive visualization techniques that study in-cylinder flow, fuel-oxidizer mixing, and combustion and emissions phenomena under conditions representative of production engines. These visualization techniques can provide qualitative and quantitative answers to fundamental combustion-phenomena questions such as the effects of engine design, operating conditions, fuel composition, fuel delivery strategy, and ignition techniques. The thesis is divided in two main parts. The first part focuses on the setup of a single-cylinder research engine with optical access including the design of its control system and the acquisition of in-cylinder pressure data and high-speed combustion images. The second part focuses on measurements of the turbulent flame speed using the high-speed combustion images. Crank-angle-resolved images of methane combustion were taken with a high-speed CMOS camera at a rate of 15,000 Hz. The optical engine was operated in a skip-firing mode (one fired cycle followed by 5 motored cycles) at 900 RPM and a load of 5.93 bar IMEP. The images show that flow turbulence and flame stretch resulted in flame velocities several order of magnitude higher compared to the laminar flame velocity. In addition, both in-cylinder pressure and optical data were used to determine the cycle-to cycle variability of the combustion phenomena. iii Dedication This thesis is dedicated to my beloved parents, Dr.Padmanaban, and Beena Padmanaban First and foremost, I would like to thank my research advisor Dr. Cosmin Dumitrescu for his support, knowledge and all the friendship he shared with me right from the beginning. Everything he taught me both, in academics and building me as a person will surely stay with me and help me progress in my future career. His perseverance in work have always strongly motivated me to put in a lot of efforts and set an example to my colleagues in the laboratory. I am very grateful to him for teaching me the difference between a scientific and an engineering work, helping me start transforming into a good researcher. On a lighter note, I am very thankful to him for having funded me three long semesters in my master's study. I would like to express my gratitude to Dan Carder for having initially hired me to the CAFEE, and help me settle down to work with optical engines research project. My heartfelt thanks are due to my committee member Dr. Arvind Thiruvengadam for having been a good friend and a wonderful source of inspiration. With his stature and knowledge, nobody I could think of to have been this modest, helpful and...

show abstract

A Comprehensive Numerical Study on Effects of Natural Gas Composition on the Operation of an HCCI Engine

Cited by 17 publications

References 26 publications

Investigation on gaseous fuels interchangeability with an extended zero-dimensional engine model

Investigation on gaseous fuels interchangeability with an extended zero-dimensional engine model

A Comparative Study on Influence of Natural Gas Composition on the Performance of a CNG Engine

Investigation of Combustion Phenomena in a Single-Cylinder Spark-Ignited Natural Gas Engine with Optical Access

Contact Info

Product

Resources

About