The Impact of Fuel Distribution on Cyclic Combustion Variations in a Natural Gas Fueled Spark Ignition Engine PDF Download
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Author: Joel D. Hiltner
Publisher:
ISBN:
Category :
Languages : en
Pages : 428
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Book Description
Author: Joel D. Hiltner
Publisher:
ISBN:
Category :
Languages : en
Pages : 428
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
Dual fuel pilot ignited natural gas engines are identified as an efficient and viable alternative to conventional diesel engines. This paper examines cyclic combustion fluctuations in conventional dual fuel and in dual fuel partially premixed low temperature combustion (LTC). Conventional dual fueling with 95% (energy basis) natural gas (NG) substitution reduces NOx emissions by almost 90%t relative to straight diesel operation; however, this is accompanied by 98% increase in HC emissions, 10 percentage points reduction in fuel conversion efficiency (FCE) and 12 percentage points increase in COVimep. Dual fuel LTC is achieved by injection of a small amount of diesel fuel (2-3 percent on an energy basis) to ignite a premixed natural gas−air mixture to attain very low NOx emissions (less than 0.2 g/kWh). Cyclic variations in both combustion modes were analyzed by observing the cyclic fluctuations in start of combustion (SOC), peak cylinder pressures (Pmax), combustion phasing (Ca50), and the separation between the diesel injection event and Ca50 (termed "relative combustion phasing" ). For conventional dual fueling, as % NG increases, Pmax decreases, SOC and Ca50 are delayed, and cyclic variations increase. For dual fuel LTC, as diesel injection timing is advanced from 20° to 60° BTDC, the relative combustion phasing is identified as an important combustion parameter along with SoC, Pmax, and CaPmax. For both combustion modes, cyclic variations were characterized by alternating slow and fast burn cycles, especially at high %NG and advanced injection timings. Finally, heat release return maps were analyzed to demonstrate thermal management strategies as an effective tool to mitigate cyclic combustion variations, especially in dual fuel LTC.
Author: American Society of Mechanical Engineers. Internal Combustion Engine Division. Technical Conference
Publisher:
ISBN:
Category : Internal combustion engines
Languages : en
Pages : 180
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Author: Shawn Nicholas Wildhaber
Publisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 0
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Book Description
"High fuel efficiency has become an extremely desirable trait for internal combustion engines. This motivation has driven extensive research on methods to improve fuel efficiency on engines of various sizes. Many of these methods involve changes to the properties of the combustion process. One way to induce these property changes is through varying the phasing of combustion. Combustion phasing can be defined as the time in the engine cycle, specifically the compression and expansion strokes, where combustion occurs. A change in combustion phasing causes a change in combustion duration. The duration of combustion impacts how the energy and work potential of the energy (availability) from the fuel are utilized. Analysis techniques based on the first and second law of thermodynamics have been developed to determine the energy and availability distributions. These distributions are utilized to visualize and quantify any improvements made to engine efficiency as combustion phasing is altered. The test engine utilized is a spark ignition (SI) engine meaning that the combustion phasing variations are completed by varying the ignition timing. In light of the test platform being a two-cylinder, industrial-use engine, this thesis focuses on determining the impact of combustion phasing on energy and availability distributions in an air-cooled, rich running utility engine subject to tight manufacturing cost constraints"--Abstract, leaf iii
Author:
Publisher:
ISBN:
Category : Railroad engineering
Languages : en
Pages : 582
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Author: Ibrahim Dincer
Publisher: Springer
ISBN: 3319046810
Category : Technology & Engineering
Languages : en
Pages : 1055
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Book Description
This thorough and highly relevant volume examines exergy, energy and the environment in the context of energy systems and applications and as a potential tool for design, analysis, optimization. It further considers their role in minimizing and/or eliminating environmental impacts and providing for sustainable development. In this regard, several key topics ranging from the basics of the thermodynamic concepts to advanced exergy analysis techniques in a wide range of applications are covered.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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Book Description
Author: Daniel A. Stang
Publisher:
ISBN:
Category : Control theory
Languages : en
Pages : 140
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Book Description
Reducing the cyclic variability of a gasoline/natural gas dual injection spark ignition engine using minimum variance control is the subject of this thesis. Cylinder pressure is used to calculate four combustion metrics, the standard deviation of which is used as an indicator of cyclic variability. Spark timing, fuel type, and engine speed are varied to characterize the cyclic variability of the engine. Location of peak pressure is found to be the best combustion metric for use as feedback in a closed loop controller. Using the location of peak pressure as an engine output and spark timing as an engine input, system identification is used to develop input-output models. Using the model, a minimum variance controller is developed which is able to reduce the cyclic variability by 1.4\% by changing the spark timing in response to the measured location of peak pressure. A detuned minimum variance tracking controller is designed to produce maximum power in changing operating conditions by using 16 crank angle degrees after top dead center as the location of peak pressure set-point. The detuned minimum variance controller is able to track and maintain the set-point under constant operating conditions and as disturbances such as, changing fuel type, addition of internal exhaust gas recirculation, and changing coolant temperature, are introduced into the system. The detuned minimum variance controller rejects these disturbances when experimentally tested and maintains optimal engine operating conditions.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 856
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Book Description
Author: Andrey A. Radionov
Publisher: Springer Nature
ISBN: 303022063X
Category : Technology & Engineering
Languages : en
Pages : 1449
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Book Description
This book highlights recent findings in industrial, manufacturing and mechanical engineering, and provides an overview of the state of the art in these fields, mainly in Russia and Eastern Europe. A broad range of topics and issues in modern engineering are discussed, including the dynamics of machines and working processes, friction, wear and lubrication in machines, surface transport and technological machines, manufacturing engineering of industrial facilities, materials engineering, metallurgy, control systems and their industrial applications, industrial mechatronics, automation and robotics. The book gathers selected papers presented at the 5th International Conference on Industrial Engineering (ICIE), held in Sochi, Russia in March 2019. The authors are experts in various fields of engineering, and all papers have been carefully reviewed. Given its scope, the book will be of interest to a wide readership, including mechanical and production engineers, lecturers in engineering disciplines, and engineering graduates.
