Article
Thermodynamics
Rajesh Kumar Prasad, Avinash Kumar Agarwal
Summary: Experimental studies comparing HCNG and H-2 enriched CNG fuel in SI and LI modes showed that HCNG achieved a maximum thermal efficiency of 42.8% in LI mode. Additionally, BSHC emissions were consistently lower in LI mode compared to SI mode.
Article
Chemistry, Physical
Ahmet Alper Yontar, Victor Wong
Summary: This study investigated the effects of laser spark plugs on engine characteristics and compared the results with conventional spark plugs. The experiments showed that laser ignition can improve combustion efficiency and reduce energy consumption in different conditions. Additionally, laser ignition produced less NOx emissions compared to traditional spark ignition methods.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Hao Meng, Changwei Ji, Shuofeng Wang, Du Wang, Jinxin Yang
Summary: This study aimed to improve the idle performance of the n-butanol rotary engine by blending hydrogen and reducing idle speed. Results showed that hydrogen could enhance engine stability and economy, as well as effectively reduce CO and HC emissions. In addition, hydrogen enrichment could compensate for the negative effects of reducing idle speed on combustion and emissions.
Article
Energy & Fuels
Mads Carsten Jespersen, Thomas Osterby Holst Rasmussen, Anders Ivarsson
Summary: This study investigates the lean-burn characteristics of ammonia in a pre-mixed SI engine and the influence of spark energy and discharge characteristics on engine performance and emissions. The results show that by optimizing the spark ignition system, the need for an ignition improver can be mitigated. The emissions of unburned ammonia and NOx are kept at low levels, and the balance between NH3 and NOx emissions is achieved by advancing the ignition timing.
Article
Thermodynamics
Sridhar Sahoo, Dhananjay Kumar Srivastava
Summary: Compressed natural gas (CNG) has gained widespread acceptance in the automobile industry due to its clean-burning properties. Direct injection (DI) CNG engines have been studied to increase engine efficiency through higher turbulent flame speed and rapid flame front propagation. This study examines the combustion behavior of DI CNG engines and compares it to port fuel injection (PFI) CNG and gasoline engines.
Article
Energy & Fuels
Mindaugas Melaika, Gilles Herbillon, Petter Dahlander
Summary: The study investigated the performance of gaseous fuels in a spark ignition engine, showing that they can improve engine efficiency, reduce emissions, and provide stable combustion. The results indicated that DI-CNG combustion had the best performance among different injection systems, with lower particulate emissions.
Article
Chemistry, Physical
Jianbing Gao, Guohong Tian, Chaochen Ma, Yuanjian Zhang, Shikai Xing, Phil Jenner
Summary: Lean-burn was adopted as an effective method in this study to reduce NOx emissions from hydrogen combustion in ORP engines. The equivalence ratio has a significant impact on combustion and NOx emission characteristics, with effects varying with engine speeds. High NOx emissions were observed under low engine speed conditions due to hydrogen combustion near stoichiometric ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Ajay Singh, Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study investigates the cyclic combustion dynamics of a CNG-Diesel RCCI engine using nonlinear dynamical and chaotic methods. The research finds that the combustion dynamics exhibit periodic characteristics at intermediate diesel injection timings, indicating the existence of a periodic window for better cycle resolved control.
Article
Engineering, Mechanical
Ahmed Abdelrazik Elshenawy, Sayed M. Abdel Razik, M. S. Gad
Summary: The combustion of gasoline engines running on blends of compressed natural gas and hydrogen fuels was investigated using the quasi-dimensional and two-zone model. The study found that the engine's thermal efficiency and output power increased while specific fuel consumption decreased when hydrogen was blended up to 20%. The inclusion of hydrogen also had an impact on cylinder temperature, pressure, cumulative work done, and heat transfer related to compressed natural gas.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Energy & Fuels
Anas Rao, Hongyang Gao, Fanhua Ma
Summary: The study investigates the utilization of hydrogen fuel in internal combustion engines and proposes various laminar burning speed correlations for HCNG fuel mixtures. The effect of Exhaust Gas Recirculation (EGR) on the laminar burning speed is also explored, with a new correlation developed to improve the quasi-dimensional combustion model. The GRI Mech3.0 mechanism is employed for predicting laminar burning speeds under different operating conditions, showing promising results for HCNG fuel mixtures.
Article
Energy & Fuels
Ajay Singh, Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study investigates the deterministic features of the cycle-resolved location of maximum pressure and its correlation with combustion phasing in the combustion of a CNG-Diesel RCCI engine. The results show a strong relationship between the location of maximum pressure and combustion phasing in the RCCI regime.
Article
Energy & Fuels
Yingying Lu, Chao Fan, Yufeng Chen, Yize Liu, Yiqiang Pei
Summary: This study investigates the effects of a multiple injection strategy on premixed charge compression ignition (PCCI) combustion and emissions in a heavy-duty diesel engine fueled with diesel. Through experiments and numerical simulations, it was found that optimizing the injection strategy can reduce NOx and soot emissions, while improving the gross indicated thermal efficiency (ITEg).
Article
Energy & Fuels
Swapnil Sureshchandra Bhurat, Khushboo Swapnil Bhurat, Tushar Banerjee, Ram Kunwer, Santhosh Kumar Gugulothu, Subrahmanya Ranjit Pasupuleti
Summary: The experimental study found that adding hydrogen to CNG fuel can increase engine thermal efficiency, reduce fuel consumption, and significantly decrease emissions, especially carbon monoxide and nitrogen oxides. In the long term, hydrogen-CNG blend may be considered as a suitable engine fuel.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Meng Lyu, Yousif Alsulaiman, Matthew J. Hall, Ronald D. Matthews
Summary: Intake throttling is an effective method to increase the exhaust temperature of diesel engines, improving catalytic efficiency. This study investigated the influence of intake throttling on combustion characteristics and exhaust emissions of light-duty diesel engines under idle mode. The results showed that throttle position and MAP affected the in-cylinder pressure, HRR, exhaust temperature, and emissions.
Article
Environmental Sciences
Miahn Rasheeq Aosaf, Yang Wang, Ke Du
Summary: This study measured and compared the emission factors of passenger cars burning different fuels. Diesel vehicles had the highest emission factor for CO, CNG vehicles had the highest emission factor for HC, and diesel vehicles again had the highest emission factor for NO. Only gasoline-fueled vehicles showed an increase in emission factors with the vehicle age.
ENVIRONMENTAL POLLUTION
(2022)
