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Dissertations / Theses on the topic 'CNG Engines'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Viglione, Ludovico. "Analysis of injection, mixture formation and combustion processes for innovative CNG Engines." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2690247.

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Natural gas is a promising alternative fuel for internal combustion engines application due to its low carbon content and high knock resistance. The work presented in this thesis deals with the fluid dynamics, experimental study and optimization of different technologies aimed at exploiting the potentials of such fuel at best. The first section of the work is aimed at the combustion chamber optimization with the focus on the combustion stability. The engine considered in the study is a prototype specifically dedicated to CNG. It features a variable valve actuation system and has been released

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2

XU, JIAJIE. "Numerical and Experimental Analysis of Injection and Mixture Formation in High-Performance CNG Engines." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2751275.

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3

LAURENZANO, DANILO. "Injection and combustion analysis and knock detection models for high-efficiency natural gas engines." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2711200.

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Between different sectors, GHG emissions released by automotive one in 2010 were 4.5 GtCO2, the 14% of the total (32 GtCO2). Moreover, transport sector depends by more than 93% on oil, to be refined into gasoline and diesel fuel. Natural gas demand in transport sector has clearly increased in the last decade considering the lowest CO2 emissions per units of energy produced among different fossil fuels but it will be used mostly in the next future. Among different sectors, the 21 % of the energy demand is indeed supplied by NG, due to lower price and reduced GHG emissions. Storage type (compres

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4

GOEL, PRASHANT. "Numerical modelling and analysis of combustion in DI and PFI CNG engines - A study under different EGR dilution and Hydrogen doping conditions." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2945175.

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5

Königsson, Fredrik. "On Combustion in the CNG-Diesel Dual Fuel Engine." Doctoral thesis, KTH, Förbränningsmotorteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-151188.

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Currently there is a large interest in alternative transport fuels. There are two underlying reasons for this interest: the desire to decrease the environmental impact of transports and the need to compensate for the declining availability of petroleum. In the light of both these factors, the CNG-diesel dual fuelengine is an attractive concept. The primary fuel of the dual fuel engine is methane, which can be derived both from renewables and from fossil sources. Methane from organic waste, commonly referred to as biomethane, can provide a reduction in greenhouse gases unmatched by any other fu

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6

Šmerda, Ondřej. "Návrh koncepce leteckého motoru na CNG." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401574.

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Master’s thesis deals with comparsion and rating the compressed natural gas as an aircraft piston engine fuel. An information search of conventional fuels and differences of the fuel systems for AVGAS and CNG is included. Next part describes the aircraft and its engine on which is the mathematic model based. After that perfomance and consumption data are calculated for both fuels and the results are then compared. At the end of the thesis, a design of the CNG fuel system with components selection is described.

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7

Rahimi, Najmeh. "NOx reduction in a compressed natural gas (CNG) engine with humid air intake." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10011272.

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<p>One of the major environmental challenges facing our planet and living beings is the global warming. This phenomena, known as the gradual increase in the overall temperature of earth's atmosphere is mostly caused by the greenhouse eect which is a result of increased levels of greenhouse gases. Major constitutes of these gases are Carbon Dioxide (CO2) and Nitrogen Oxides (NOx). Transportation sector is responsible for releasing a signicant portion of these gases into the atmosphere. In recent decades, many endeavors such as using alternative fuels and modications in engine cycles have been m

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8

Wojcik, Rudolf. "Sací potrubí zážehového motoru na CNG o výkonu 140kW." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231036.

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The master´s thesis is focused on the design of the multi-point CNG injection for the VW 1.4 TSI intake manifold turbocharged spark ignited engine. The 3D model that was created using Autodesk Inventor Professional 2012 is based on the real intake manifold. This model served as an input for CFD analyses of mixing CNG with air. These were made in STAR-CCM+ software.

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9

Hillstrom, David Roger. "Light Duty Natural Gas Engine Characterization." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408967285.

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10

Han, Yuwei. "Ultra-Low NOx Measurement and Emission Factors Evaluation of a Compressed Natural Gas (CNG) Heavy-Duty Engine." Thesis, University of California, Riverside, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10194518.

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<p> Heavy duty on-road vehicles represent one of the largest sources of NO<sub> x</sub> emissions and fuel consumption in North America. Heavy duty vehicles are predominantly fueled with diesel, with the recent interest in natural gas (NG) systems. As emissions and greenhouse gas regulations continue to tighten new opportunities for advanced fleet specific heavy duty vehicles are becoming available with improved fuel economy. NO<sub>x</sub> emissions have dropped 90% for heavy duty vehicles with the recent 2010 certification limit. Additional NO<sub>x</sub> reductions of another 90% are desire

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11

Tenora, Tomáš. "Racionalizace výroby součásti zemědělského stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318724.

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This master's thesis deals with the process of machining a forged connecting rod in cooperation with the company Zetor Tractors a.s. The first chapter of the thesis is focused on a detailed introduction of the company. The second chapter includes an elaborate analysis of the technical documentation and requirements concerning the making process of the subject of study, specifically the construction of the connecting rod. In the third chapter, the current production technology is discussed and described in detail. The aim of the fourth chapter is to propose an innovative technology which can be

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12

Ringenson, Josefin. "Efficiency of CNN on Heterogeneous Processing Devices." Thesis, Linköpings universitet, Programvara och system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-155034.

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In the development of advanced driver assistance systems, computer vision problemsneed to be optimized to run efficiently on embedded platforms. Convolutional neural network(CNN) accelerators have proven to be very efficient for embedded camera platforms,such as the ones used for automotive vision systems. Therefore, the focus of this thesisis to evaluate the efficiency of a CNN on a future embedded heterogeneous processingdevice. The memory size in an embedded system is often very limited, and it is necessary todivide the input into multiple tiles. In addition, there are power and speed const

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13

Jelínek, Petr. "Obrobení náboje kola formulového vozu na CNC obráběcím centru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229749.

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The master thesis deals with design and manufacturing of rear right formula hub on CNC machining centre by using modern CAD/CAM technologies. The theoretical part is focused on description and characterization of milling technology and machinability of aluminium alloys. The practical part is focused on the designing formula hub in CAD software Pro/Engineer, proposing machining strategies by using CAM software PowerMILL and manufacturing on CNC machine. There is technical economic evaluation of the machined part at the end of the thesis.

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14

Morgan, Jolvani. "TÉCNICAS DE SEGMENTAÇÃO DE IMAGENS NA GERAÇÃO DE PROGRAMAS PARA MÁQUINAS DE COMANDO NUMÉRICO." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/8071.

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This work describes a tool for extraction of features in 2D images applied to industrial automation. The method uses techniques implemented targeting of images into pieces model as detection of edges in the extraction of spatial coordinates of the image and import applications in CAD (Computer-Aided Design) for the generation of programmers for Computer Numerical Control (CNC). This work is to copy a particular model (image) from an existing object, which features a process of reverse engineering. An initial prototype was developed using the Java language with the Eclipse IDE and library for h

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15

Garg, Manish. "Studies On Fuel-Air Stratification And Combustion Modelling In A CNG-Fuelled Engine." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2593.

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In-cylinder fuel-air mixing in a compressed natural gas (CNG)-fuelled, single-cylinder, spark-ignited engine is analysed using a transient three-dimensional computational fluid dynamic model built and run using STAR-CD, a commercial CFD software. This work is motivated by the need for strategies to achieve improved performance in engines utilizing gaseous fuels such as CNG. The transient in-cylinder fuel-air mixing is evaluated for a port gas injection fuelling system and compared with that of conventional gas carburetor system. In this work pure methane is used as gaseous fuel for all the com

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16

Garg, Manish. "Studies On Fuel-Air Stratification And Combustion Modelling In A CNG-Fuelled Engine." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2593.

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In-cylinder fuel-air mixing in a compressed natural gas (CNG)-fuelled, single-cylinder, spark-ignited engine is analysed using a transient three-dimensional computational fluid dynamic model built and run using STAR-CD, a commercial CFD software. This work is motivated by the need for strategies to achieve improved performance in engines utilizing gaseous fuels such as CNG. The transient in-cylinder fuel-air mixing is evaluated for a port gas injection fuelling system and compared with that of conventional gas carburetor system. In this work pure methane is used as gaseous fuel for all the com

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17

Swain, Ranjan Kumar. "Studies on multicyclinder diesel engine using compressed natural gas (CNG), Hydrogen and CNG-Hydrogen blends." Thesis, 2005. http://localhost:8080/xmlui/handle/12345678/6156.

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18

KUMAR, PARVESH. "EXPERIMENTAL INVESTIGATIONS ON PERFORMANCE OF DUAL FUEL DIESEL ENGINE USING CNG AND BIODIESEL." Thesis, 2017. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16045.

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The power generation and transportation sectors are heavily dependent on fossil fuels, whose combustion results in high level of air pollution. However, uncertainties about the long-term availability coupled with price perturbation of fossil fuels are a key challenge due to which alternative fuels are getting more attention. Gaseous fuels such as Compressed Natural Gas (CNG) or hydrogen are very promising for use in Spark Ignition (SI) or Compression Ignition (CI) Engines. The research on the use of gaseous fuels in CI engines is still underway unlike SI engines, where it has even

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19

Rezapour, Kambiz, Byron A. Mason, Alastair S. Wood, and Kambiz M. Ebrahimi. "Bi-fuel SI Engine Model for Analysis and Optimization." 2014. http://hdl.handle.net/10454/10983.

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Yes<br>The natural gas as an alternative fuel has economical and environmental benefits. Bi-fuel engines powered by gasoline and compressed natural gas (CNG) are an intermediate and alternative step to dedicated CNG engines. The conversion to bi-fuel CNG engine could be a short-term solution to air pollution problem in many developing countries. In this paper a mathematical model of a bi-fuel four-stroke spark ignition (SI) engine is presented for comparative studies and analysis. It is based on the two-zone combustion model, and it has the ability to simulate turbulent combustion. The model i

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20

KUMAR, SANDEEP. "PERFORMANCE AND EMISSIONS TESTING OF GASOLINE AND CNG ON A SI ENGINE." Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15685.

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Nowadays, increased attention has been focused on internal combustion engine fuels. Compressed natural gas has been introduced as an alternative to gasoline and diesel fuels in many applications. A high research octane number which allows combustion at higher compression ratios without knocking phenomenon and good emission characteristics of unburned hydrocarbons and carbon monoxide are major benefits of compressed natural gas as an engine fuel. In Present work an experimental study is conducted using gasoline and compressed natural gas (CNG) as the main fuel in a 4-cylinder,4-stroke spark ig

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21

BAIRWA, RAJNISH. "EXPERIMENTAL ANALYSIS OF GASOLINE AND CNG IN A SI ENGINE FOR PERFORMANCE AND EMISSIONS." Thesis, 2012. http://dspace.dtu.ac.in:8080/jspui/handle/repository/13923.

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M.TECH<br>It is well known, that fossil fuel reserves all over the world are diminishing at an alarming rate and a shortage of crude oil expected at the early decades of this century. Probably in this century, it believed that crude oil and petroleum products become very scare and costly to find and produce. Gasoline and diesel will become scarce and most costly. Alternative fuel technology, availability and use must and will become more common in the coming decades. Any researchers did the several researches to substitute fossil fuel oil to another alternative fuels and one of it is use

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22

KUMAR, PANKAJ. "PERFORMANCE AND EMISSIONS ANALYSIS OF CNG–DIESEL DUAL FUEL ON A VCR ENGINE." Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14370.

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ABSTRACT The rapidly depletion of petroleum reserves or resources have promoted research for alternative fuels for internal combustion engines. The C.I. Engine is a very important prime mover being used in the buses, trucks, locomotives, tractors, pumping sets and many other applications, small and medium electric power generation and marine propulsion etc. The running costs of C.I. Engines are much less than S.I. Engines and hence make them attractive for industrial, transport and other applications. A dual fuel diesel engine is a diesel engine fitted with a fuel conversion kit to enab

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23

Reddy, Y. V. Raghavendra. "Studies on a CNG-fuelled spark ignition engine using a gas injection system." Thesis, 1999. http://localhost:8080/xmlui/handle/12345678/6450.

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24

Boddez, Jason Bradley. "Evaluation of SI-HCCI-SI mode-switching using conventional actuation on a CNG engine." Master's thesis, 2011. http://hdl.handle.net/10048/1825.

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Homogeneous Charge Compression Ignition (HCCI) operation is desirable for its high thermal efficiency and low emissions of NOx and particulates. Difficulty with cold starting and maximum achievable speed/load highlight the desire for mode-switching to traditional spark ignition (SI) operation. Mode-switching between SI and HCCI is investigated using only actuation of throttle, CNG injector pulse width, and CNG injection timing on a single cylinder CFR engine. Open-loop control achieves a one cycle mode-switch between two adjustable IMEP levels. Sequences are repeatable as demonstrated by 10 m

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25

Srivastava, Rajiv. "Studies on CNG substitution in a diesel fuelled tractor engine using exhaust gas recirculation." Thesis, 2003. http://localhost:8080/xmlui/handle/12345678/6492.

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26

Soni, Shyam Lal. "Compresses natural gas(CNG) fuelled spark ignition engine-gas injection,combustion,performance and exhaust emission studies." Thesis, 1997. http://localhost:8080/iit/handle/2074/5047.

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27

Mahla, Sunil Kumar. "Studies on utilization of CNG and biodiesal blend in a compression ignition engine using exhaust gas recirulation." Thesis, 2007. http://localhost:8080/xmlui/handle/12345678/6205.

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28

HUANG, TIAN-LIN, and 黃天麟. "A Multi-vendor CNC Tool Holder Search Engine with Standardized Metadata." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4pq544.

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碩士<br>國立暨南國際大學<br>資訊管理學系<br>106<br>Searching holders manually in catalogs to make a pair of CNC holder and tool is time wasting and inefficient. As there are no standards for the parameters of holders, this searching can even ineffective in multi-vendor environment. In this thesis, we design and implement a search engine for multi-vendor tool holder based on standardized metadata. The search engine has following advantages: ・CNC tool holders can be searched with standardized data. ・Using metadata to render input view and to generate an exclusive data structure of a CNC tool holder. ・Showing or

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29

Lourenço, Carlos Eduardo Ribeiro. "Contribuição para o fabrico de motor de ciclo sobre-expandido." Master's thesis, 2012. http://hdl.handle.net/1822/22676.

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Dissertação de mestrado integrado em Engenharia Mecânica<br>Desde o aparecimento dos primeiros motores de combustão interna, estes têm sido constantemente alvo de evoluções em função das necessidades do meio ao qual se destinam, seja a procura por melhor fiabilidade, por maiores potências ou mesmo pela otimização dos mesmos de modo a tornar o seu custo de produção mais sustentável. Atualmente existe uma crescente preocupação pelos problemas ambientais, bem como pela escassez das reservas de petróleo, o que associado à crise económico-financeira vivida torna a procura por uma maior eficiê

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