Analysis Of Homogeneous Charge Compression Ignition Engine With Emphasis On Combustion Timing And Reaction Rate
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Analysis Of Homogeneous Charge Compression Ignition Engine With Emphasis On Combustion Timing And Reaction Rate
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Author : Arunim Bhattacharya
language : en
Publisher:
Release Date : 2017
Analysis Of Homogeneous Charge Compression Ignition Engine With Emphasis On Combustion Timing And Reaction Rate written by Arunim Bhattacharya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Engineering categories.
HCCI engines are a class of engines which use high compression ratio to ignite a charge of air-fuel mixture, essentially eliminating the need for spark plugs. This contrasts with diesel engines (although HCCI can be used for diesel engines) where the fuel is injected near the top dead center of the compression stroke regime. Gasoline HCCI engines are of significance because, it attempts to improve the characteristics of the engine for example the thermal efficiency. High compression ratio comes with higher thermal efficiency, yet the peak temperature remains low enough to have low production rates of harmful oxides of nitrogen and formation of soot. However, there are certain challenges associated with such type of engine, one of which and perhaps the most important of all is how to control the combustion rate. Flow dynamics and chemical-kinetics analysis, is essential to predict combustion timing, duration, and rate. The objective of this study is to analyze a HCCI engine using, simulation analysis models including a three-dimensional CFD simulation model. Simulation analysis is carried out using a generic HCCI engine, initially with simplified chemical kinetics, and then using detailed chemical kinetics and using RANS turbulence CFD model. A sensitivity analysis of the effect of RPM on the combustion time, burn duration, heat release, efficiency and emission concentration are carried out.
Control And Robustness Analysis Of Homogeneous Charge Compression Ignition Using Exhaust Recompression
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Author : Hsien-Hsin Liao
language : en
Publisher: Stanford University
Release Date : 2011
Control And Robustness Analysis Of Homogeneous Charge Compression Ignition Using Exhaust Recompression written by Hsien-Hsin Liao and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
There has been an enormous global research effort to alleviate the current and projected environmental consequences incurred by internal combustion (IC) engines, the dominant propulsion systems in ground vehicles. Two technologies have the potential to improve the efficiency and emissions of IC engines in the near future: variable valve actuation (VVA) and homogeneous charge compression ignition (HCCI). IC engines equipped with VVA systems are proven to show better performance by adjusting the valve lift and timing appropriately. An electro-hydraulic valve system (EHVS) is a type of VVA system that possesses full flexibility, i.e., the ability to change the valve lift and timing independently and continuously, making it an ideal rapid prototyping tool in a research environment. Unfortunately, an EHVS typically shows a significant response time delay that limits the achievable closed-loop bandwidth and, as a result, shows poor tracking performance. In this thesis, a control framework that includes system identification, feedback control design, and repetitive control design is presented. The combined control law shows excellent performance with a root-mean-square tracking error below 40 [Mu]m over a maximum valve lift of 4 mm. A stability analysis is also provided to show that the mean tracking error converges to zero asymptotically with the combined control law. HCCI, the other technology presented in this thesis, is a combustion strategy initiated by compressing a homogeneous air-fuel mixture to auto-ignition, therefore, ignition occurs at multiple points inside the cylinder without noticeable flame propagation. The result is rapid combustion with low peak in-cylinder temperature, which gives HCCI improved efficiency and reduces NOx formation. To initiate HCCI with a typical compression ratio, the sensible energy of the mixture needs to be high compared to a spark ignited (SI) strategy. One approach to achieve this, called recompression HCCI, is by closing the exhaust valve early to trap a portion of the exhaust gas in the cylinder. Unlike a SI or Diesel strategy, HCCI lacks an explicit combustion trigger, as autoignition is governed by chemical kinetics. Therefore, the thermo-chemical conditions of the air-fuel mixture need to be carefully controlled for HCCI to occur at the desired timing. Compounding this challenge in recompression HCCI is the re-utilization of the exhaust gas which creates cycle-to-cycle coupling. Furthermore, the coupling characteristics can change drastically around different operating points, making combustion timing control difficult across a wide range of conditions. In this thesis, a graphical analysis examines the in-cylinder temperature dynamics of recompression HCCI and reveals three qualitative types of temperature dynamics. With this insight, a switching linear model is formulated by combining three linear models: one for each of the three types of temperature dynamics. A switching controller that is composed of three local linear feedback controllers can then be designed based on the switching model. This switching model/control formulation is tested on an experimental HCCI testbed and shows good performance in controlling the combustion timing across a wide range. A semi-definite program is formulated to find a Lyapunov function for the switching model/control framework and shows that it is stable. As HCCI is dictated by the in-cylinder thermo-chemical conditions, there are further concerns about the robustness of HCCI, i.e., the boundedness of the thermo-chemical conditions with uncertainty existing in the ambient conditions and in the engine's own characteristics due to aging. To assess HCCI's robustness, this thesis presents a linear parameter varying (LPV) model that captures the dynamics of recompression HCCI and possesses an elegant model structure that is more amenable to analysis. Based on this model, a recursive algorithm using convex optimization is formulated to generate analytical statements about the boundedness of the in-cylinder thermo-chemical conditions. The bounds generated by the algorithm are also shown to relate well to the data from the experimental testbed.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Characteristics And Control Of Low Temperature Combustion Engines
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Author : Rakesh Kumar Maurya
language : en
Publisher: Springer
Release Date : 2017-11-03
Characteristics And Control Of Low Temperature Combustion Engines written by Rakesh Kumar Maurya and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-03 with Technology & Engineering categories.
This book deals with novel advanced engine combustion technologies having potential of high fuel conversion efficiency along with ultralow NOx and particulate matter (PM) emissions. It offers insight into advanced combustion modes for efficient utilization of gasoline like fuels. Fundamentals of various advanced low temperature combustion (LTC) systems such as HCCI, PCCI, PPC and RCCI engines and their fuel quality requirements are also discussed. Detailed performance, combustion and emissions characteristics of futuristic engine technologies such as PPC and RCCI employing conventional as well as alternative fuels are analyzed and discussed. Special emphasis is placed on soot particle number emission characterization, high load limiting constraints, and fuel effects on combustion characteristics in LTC engines. For closed loop combustion control of LTC engines, sensors, actuators and control strategies are also discussed. The book should prove useful to a broad audience, including graduate students, researchers, and professionals Offers novel technologies for improved and efficient utilization of gasoline like fuels; Deals with most advanced and futuristic engine combustion modes such as PPC and RCCI; Comprehensible presentation of the performance, combustion and emissions characteristics of low temperature combustion (LTC) engines; Deals with closed loop combustion control of advanced LTC engines; State-of-the-art technology book that concisely summarizes the recent advancements in LTC technology. .
Chemical Biological And Environmental Engineering Proceedings Of The International Conference On Cbee 2009
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Author : Li Kai
language : en
Publisher: World Scientific
Release Date : 2010
Chemical Biological And Environmental Engineering Proceedings Of The International Conference On Cbee 2009 written by Li Kai and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Technology & Engineering categories.
Held in Singapore from 9 to 11 October 2009, the 2009 International Conference on Chemical, Biological and Environmental Engineering (CBEE 2009) aims to provide a platform for researchers, engineers, academicians as well as industrial professionals from all over the world to present their research and development activities in chemical, biological and environmental engineering. Conference delegates will also have the opportunity to exchange new ideas and application experiences, establish business or research relations and find global partners for future collaboration. Sample Chapter(s). Chapter 1: The Future of Biopharmaceutics'' Production (92 KB). Contents: Study on Pyrolysis Characteristics of Electronic Waste (J Sun et al.); Application of Noise Mapping on Environmental Management (K-T Tsai et al.); Characteristics and Transport Properties of Two Modified Zero Valent Iron (Y-H Lin et al.); Synthesis of Visible Light Active N-Doped Titania Photocatalyst (C Kusumawardani et al.); CFD-PBM Modeling of Vertical Bubbly Flows (M R Rahimi & H Karimi); Hydrotalcite-Like Synthesis Using Magnesium from Brine Water (E Heraldy et al.); Cement/Activated-Carbon Solidification/Stabilization Treatment of Nitrobenzene (Z Su et al.); Investigation of Fish Species Biodiversity in Haraz River (I Piri et al.); Risk Assessment of Fluoride in Indian Context (V Chaudhary & M Kumar); Light Transmission In Fluidized Bed (E Shahbazali et al.); Drying of Mushroom Using a Solar Tunnel Dryer (M A Basunia et al.); and other papers. Readership: Researchers, engineers, academicians and industrial professionals in related fields of chemical, biological and environmental engineering.
Energy For Propulsion
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Author : Akshai K. Runchal
language : en
Publisher: Springer
Release Date : 2018-07-06
Energy For Propulsion written by Akshai K. Runchal and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-06 with Technology & Engineering categories.
This research book provides state-of-the-art advances in several areas of energy generation from, and environmental impact of, fuels and biofuels. It also presents novel developments in the areas of biofuels and products from various feedstock materials along with thermal management, emission control and environmental issues. Availability of clean and sustainable energy is of paramount importance in all applications of energy, power, mobility and propulsion. This book is written by internationally renowned experts from around the globe. They provide the latest innovations in cleaner energy utilization for a wide range of devices. The energy and environment sustainability requires a multipronged approach involving development and utilization of new and renewable fuels, design of fuel-flexible combustion systems and novel and environmentally friendly technologies for improved fuel use. This book serves as a good reference for practicing engineers, educators and research professionals.
Science Technology Review
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Author :
language : en
Publisher:
Release Date : 1999
Science Technology Review written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Military research categories.
Engineering Research Methods
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Author : Nor Mariah Adam
language : en
Publisher: Lulu.com
Release Date : 2012-02-25
Engineering Research Methods written by Nor Mariah Adam and has been published by Lulu.com this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-25 with Technology & Engineering categories.
Proceedings Of The Fall Technical Conference Of The Asme Internal Combustion Engine Division
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Author : American Society of Mechanical Engineers. Internal Combustion Engine Division. Technical Conference
language : en
Publisher:
Release Date : 2007
Proceedings Of The Fall Technical Conference Of The Asme Internal Combustion Engine Division written by American Society of Mechanical Engineers. Internal Combustion Engine Division. Technical Conference and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Internal combustion engines categories.
Encyclopedia Of Automotive Engineering
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Author :
language : en
Publisher: John Wiley & Sons
Release Date : 2015-03-23
Encyclopedia Of Automotive Engineering written by and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-23 with Technology & Engineering categories.
Erstmals eine umfassende und einheitliche Wissensbasis und Grundlage für weiterführende Studien und Forschung im Bereich der Automobiltechnik. Die Encyclopedia of Automotive Engineering ist die erste umfassende und einheitliche Wissensbasis dieses Fachgebiets und legt den Grundstein für weitere Studien und tiefgreifende Forschung. Weitreichende Querverweise und Suchfunktionen ermöglichen erstmals den zentralen Zugriff auf Detailinformationen zu bewährten Branchenstandards und -verfahren. Zusammenhängende Konzepte und Techniken aus Spezialbereichen lassen sich so einfacher verstehen. Neben traditionellen Themen des Fachgebiets beschäftigt sich diese Enzyklopädie auch mit "grünen" Technologien, dem Übergang von der Mechanik zur Elektronik und den Möglichkeiten zur Herstellung sicherer, effizienterer Fahrzeuge unter weltweit unterschiedlichen wirtschaftlichen Rahmenbedingungen. Das Referenzwerk behandelt neun Hauptbereiche: (1) Motoren: Grundlagen; (2) Motoren: Design; (3) Hybrid- und Elektroantriebe; (4) Getriebe- und Antriebssysteme; (5) Chassis-Systeme; (6) Elektrische und elektronische Systeme; (7) Karosserie-Design; (8) Materialien und Fertigung; (9) Telematik. - Zuverlässige Darstellung einer Vielzahl von Spezialthemen aus dem Bereich der Automobiltechnik. - Zugängliches Nachschlagewerk für Jungingenieure und Studenten, die die technologischen Grundlagen besser verstehen und ihre Kenntnisse erweitern möchten. - Wertvolle Verweise auf Detailinformationen und Forschungsergebnisse aus der technischen Literatur. - Entwickelt in Zusammenarbeit mit der FISITA, der Dachorganisation nationaler Automobil-Ingenieur-Verbände aus 37 Ländern und Vertretung von über 185.000 Ingenieuren aus der Branche. - Erhältlich als stets aktuelle Online-Ressource mit umfassenden Suchfunktionen oder als Print-Ausgabe in sechs Bänden mit über 4.000 Seiten. Ein wichtiges Nachschlagewerk für Bibliotheken und Informationszentren in der Industrie, bei Forschungs- und Schulungseinrichtungen, Fachgesellschaften, Regierungsbehörden und allen Ingenieurstudiengängen. Richtet sich an Fachingenieure und Techniker aus der Industrie, Studenten höherer Semester und Studienabsolventen, Forscher, Dozenten und Ausbilder, Branchenanalysen und Forscher.