Article
Environmental Sciences
Zhikun Cao, Han Wu, Ruina Zhao, Haohan Wang, Zhicheng Shi, Guixian Zhang, Xiangrong Li
Summary: The combustion of wall-impinging diesel spray of heavy-duty diesel engines under cold-start conditions leads to an increase in soot emissions. The soot mainly accumulates in the spray interaction zone and specific regions of the combustion chamber, and increasing the mass of starting fuel further enhances soot generation and hinders its complete oxidation.
Article
Energy & Fuels
Ashutosh Jena, Utkarsha Sonawane, Avinash Kumar Agarwal
Summary: In this study, the engine characteristics of a light-duty commercial diesel engine operated in partially premixed combustion (PPC) mode with lower and higher DEE-diesel blends were investigated. The PPC mode exhibited higher/comparable brake thermal efficiency (BTE) compared to the baseline conventional diesel combustion (CDC) mode. However, the PPC mode showed higher nitrogen oxide (NOx) emissions and requires further optimization.
Article
Energy & Fuels
Avinash Kumar Agarwal, Prashumn, Krishn Chandra
Summary: The study demonstrates that adding di-ethyl ether (DEE) to tractor diesel engines can improve combustion efficiency and reduce emissions, with a maximum substitution rate of 45% diesel. DEE-diesel blends exhibit longer combustion duration at high loads and better performance at low to medium loads.
Article
Green & Sustainable Science & Technology
Ali Zare, Timothy A. Bodisco, Puneet Verma, Mohammad Jafari, Meisam Babaie, Liping Yang, M. M. Rahman, Andrew P. W. Banks, Zoran D. Ristovski, Richard J. Brown, Svetlana Stevanovic
Summary: The use of biofuels in the transportation sector is increasing, and this study investigates their influence on particulate matter emissions during cold-start and warm-up operations. The research reveals that biofuels have a more adverse impact on particle emissions during cold-start, with an increase in particle concentration and size, particularly for particles smaller than 23 nm.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Energy & Fuels
Avinash Kumar Agarwal, Prashumn, Hardikk Valera, Nirendra Nath Mustafi
Summary: The study investigated the impact of DEE-diesel blends on unregulated and particulate emissions from the engine, showing that DEE-diesel blends can reduce total particle number and mass emissions to some extent.
Article
Thermodynamics
Haiyan Chen, Zhongjie Shi, Yue Wu, Yikai Li, Dongfang Wang
Summary: This paper investigates the effect of injection pressure on the two-stage ignition process of fuel spray under cold-start conditions and establishes an analytical model accordingly. The experimental results show that increasing injection pressure leads to a decrease in low-temperature ignition delay time and an increase in cool flame propagation time, resulting in a non-monotonic trend for high-temperature ignition delay.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Roshan Raman, Naveen Kumar
Summary: This study examines the impact of di-ethyl ether (DEE) in a gaseous fueled engine. It is found that using a DEE/diesel mixture can increase the brake thermal efficiency (BTE) of the engine, especially when DEE proportion is up to 10% using BD10 pilot fuel at 80% load. However, further increasing the proportion of DEE results in slightly inferior performance compared to conventional diesel mode. Additionally, the use of DEE in the acetylene-fueled engine significantly reduces emissions of HC, CO, NOx, and smoke.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Thermodynamics
Hao Sun, Wugao Zhang, Yixuan Wang
Summary: This study investigates the problem of achieving fast and reliable cold starts of diesel engines at extremely low temperatures. It suggests that premixing a precise amount of diethyl ether in the intake can significantly improve the starting performance. Optimizing diesel fuel injection strategies and the use of diethyl ether improve the cold-start performance and reduce energy consumption.
Article
Chemistry, Physical
Like Yue, Shixue Wang, Yu Zhu, Yue Fan
Summary: Experimental methods were used to study the effect of assembly torque and channel size on cold start performance. It was found that an assembly torque of 2 N·m resulted in better cold start performance, and a channel width of 0.5 mm and depth of 0.3 mm led to the best cold start performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Dongfang Wang, Zhongjie Shi, Ziming Yang, Haiyan Chen, Yikai Li
Summary: The combustion of wall-impinging diesel spray, which is influenced by limited in-cylinder space, is a common phenomenon in small and medium-sized diesel engines under cold-start conditions. Through quantitative analysis of mixture formation, ignition, and combustion characteristics, it was found that the diesel spray is guided by the piston surface and limited in-cylinder space, resulting in high-temperature ignition in the region between the two spray paths. During cold-start, high-temperature ignition occurs in the region between the two spray paths at different injection timings. The flame propagates from the higher equivalence ratio region near the piston surface to the lower equivalence ratio region in the center of the combustion chamber. Early injection timing leads to a leaner mixture and a longer transition period from low-temperature to high-temperature reactions, limiting the ability to control high-temperature ignition and thermal power conversion. The optimal injection timing during cold-start was found to be -13 degrees CA ATDC for the diesel engine in this study.
Article
Energy & Fuels
Paulina Mitan-Zalewska, Oleh Klyus, Maciej Kozak
Summary: This article presents the results of research on using a mixture of diesel oil and ethyl-tertiary-butyl ether as fuel for compression-ignition engines. A mathematical model was built to verify the calculations, which focused on analyzing the elemental composition and carbon content of the fuel. The results show the feasibility of using ethyl-tertiary-butyl ether as a fuel for diesel engines, with similar performance to using 100% diesel.
Article
Engineering, Environmental
Ali Zare, Meisam Babaie, Alireza Shirneshan, Puneet Verma, Liping Yang, Zoran D. Ristovski, Richard J. Brown, Timothy A. Bodisco, Svetlana Stevanovic
Summary: The increasing use of biofuels in vehicles leads to increased particle toxicity, especially during cold-start. Adding lubricating oil to the fuel blend increases particle concentration and decreases particle size during cold-start.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Thermodynamics
Yaqing Bo, Han Wu, Juan J. Hernandez, Zhicheng Shi, Weiren Cao, Xiangrong Li
Summary: This study systematically analyzes the effects of the distance between the cold wall and spray nozzle on the spray and ignition characteristics of diesel engines. The results showed that the cold wall has little influence on ignition when the wall distance is larger, but delays chemical reactions and causes misfires when the wall distance is smaller. Varying wall distance also changes the timing of local fuel cooling, resulting in different effects.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Utkarsha Sonawane, Avinash Kumar Agarwal
Summary: This simulation study investigates the effect of fuel and ambient temperatures on the spray characteristics of diesel engines during cold starting. The results show that fuel and ambient temperatures significantly affect spray atomization and evaporation, and increasing both temperatures can improve the spray performance.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Thermodynamics
Seyed Hadi Pourhoseini, Maryam Ghodrat, Mojtaba Baghban, Zohreh Shams
Summary: This study investigates the effect of iron nanoparticles additive on the emissions of a diesel engine in low temperatures and cold start conditions. The results show that the addition of iron nanoparticles reduces the viscosity of the fuel, enhances combustion efficiency, and reduces pollutant emissions.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Adrian Clenci, Vasile Hara, Nicolae-Doru Stanescu, Rodica Niculescu
Summary: With greenhouse gas emissions posing the greatest challenge to internal combustion engines, the passenger car industry is seeking technologies, such as variable compression ratio systems, to increase engine efficiency and reduce CO2 emissions. The transition to these new technologies is crucial for responding effectively to changing operating conditions, especially for passenger car road mobility.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Rodica Niculescu, Mihaela Nastase, Adrian Clenci
Summary: Given the increasing concern for environmental protection and the need for alternatives to fossil fuels, this paper presents a method for determining the boiling points of fatty acid methyl-esters (FAME) using gas chromatography (GC) on a standard GC instrument. The method was validated by comparing the results with those obtained by vacuum distillation.
Article
Energy & Fuels
Adrian Clenci, Julien Berquez, Robert Stoica, Rodica Niculescu, Bogdan Cioc, Catalin Zaharia, Victor Iorga-Siman
Summary: Future passenger cars need to comply with regulations to reduce greenhouse gas emissions and pollution. Catalytic converters in internal combustion engines have difficulty igniting during cold starts, so additional systems like afterburners are necessary to achieve efficient treatment. This paper focuses on the challenges of using an afterburner and proposes a layout and operation strategy for the device. Experimental investigations show that the afterburner effectively improves the ignition performance of the catalyst, leading to efficient pollutant treatment.
Article
Engineering, Electrical & Electronic
Marcellin Perceau, Philippe Guibert, Adrian Clenci, Mihai Niculae, Stephane Guilain, Victor Iorga-Siman
Summary: This study evaluated the impact of the Miller cycle on the internal aerodynamics of a transparent spark ignition engine using CFD simulation and particle image velocimetry. It was found that implementing the early intake valve closing strategy to achieve the Miller cycle negatively affected the mean kinetic energy, turbulent kinetic energy, and fluctuating velocity towards the end of the compression stroke, thereby influencing the combustion process.
Editorial Material
Engineering, Mechanical
Adrian Clenci
INGINERIA AUTOMOBILULUI
(2021)
Article
Engineering, Mechanical
Ion Preda, Adrian Clenci, Laura Citu, Adina Matrozi, Silvia Boncescu
INGINERIA AUTOMOBILULUI
(2020)
Article
Engineering, Mechanical
Ion Preda, Adrian Clenci, Stefan Tabacu, Laura Citu, Adina Matrozi, Silvia Boncescu
INGINERIA AUTOMOBILULUI
(2020)
Proceedings Paper
Transportation Science & Technology
Mihai Niculae, Adrian Clenci, Victor Iorga-Siman, Rodica Niculescu
30TH SIAR INTERNATIONAL CONGRESS OF AUTOMOTIVE AND TRANSPORT ENGINEERING: SCIENCE AND MANAGEMENT OF AUTOMOTIVE AND TRANSPORTATION ENGINEERING
(2020)
Proceedings Paper
Education & Educational Research
Adrian Clenci, Rodica Niculescu, Bogdan N. Nicolescu
EDU WORLD 2018 - 8TH INTERNATIONAL CONFERENCE
(2019)
Article
Engineering, Mechanical
Catalin Zaharia, Rodica Niculescu, Adrian Clenci, Victor Iorga
INGINERIA AUTOMOBILULUI
(2019)
Article
Engineering, Mechanical
Laura Citu, Adina Matrozi, Silvia Boncescu, Ion Teleaga, Sebastian Parlac, Adrian Clenci
INGINERIA AUTOMOBILULUI
(2019)
