Click here to load reader

NGUYEN QUANG TRUNG PERFORMANCE STUDY - udn. · PDF file NGUYEN QUANG TRUNG PERFORMANCE STUDY OF SPARK IGNITION ENGINE USING GASOLINE- ETHANOL FUEL Major : Automotive engineering Code

  • View
    2

  • Download
    0

Embed Size (px)

Text of NGUYEN QUANG TRUNG PERFORMANCE STUDY - udn. · PDF file NGUYEN QUANG TRUNG PERFORMANCE STUDY...

  • -1-

    MINISTRY OF EDUCATION AND TRAINING THE UNIVERSITY OF DANANG

    NGUYEN QUANG TRUNG

    PERFORMANCE STUDY OF SPARK IGNITION ENGINE

    USING GASOLINE- ETHANOL FUEL

    Major : Automotive engineering

    Code : 62.52.01.16

    SUMMARY OF DOCTORAL THESIS

    DANANG – 2019

  • -2-

    The thesis is completed at:

    THE UNIVERSITY OF DANANG

    Science facilitator :

    1. Prof. Dr. Bui Van Ga

    2. Assoc. Prof. Dr. Duong Viet Dung

    Reviewer 1 : Prof. Dr. Pham Van Lang

    Reviewer 2 : Prof. Dr. Le Anh Tuan

    Reviewer 3 : Assoc. Prof. Dr. Hoang Duong Hung

    The thesis protected in front of the thesis review committee at the University of Danang.

    At : 08:30 AM, November 16, 2019

    Can find thesis at :

    - Vietnam National Library ;

    - Communication and Learning Information Resource Center,

    the University of Danang.

  • -1-

    INTRODUCTION

    1. Necessity

    Vietnam is an agricultural country with great potential for biofuel

    production. The Vietnamese government has a policy of developing

    biofuels properly expressed through the "Project of development and use

    of biofuels by 2015 and vision to 2025". The topic "Researching

    performance of spark ignition engines using gasoline- ethanol fuel" will

    contribute to solving the problem of fuel shortage, reducing

    environmental pollution and combating climate change.

    2. Objectives of research

    - Assess the impact and effectiveness of the use of gasohol on the

    spark ignition engines being circulated. On that basis, it is proposed that

    the ratio of ethanol in the mixture of gasoline-ethanol fuel ensures the

    performance of the spark ignition engine used in cars under operating

    conditions.

    - Proposing a solution to improve the intake manifold structure,

    gasoline / ethanol mixing method for compulsory spark ignition engine

    using gasohol with a flexible ratio of ethanol according to operating

    conditions in order to increase the ethanol ratio.

    3. Subjects and scope of research

    - The object of the study is an engine with 4-cylinder, 4-stroke,

    gasoline injection and spark ignition by electronically controlled. This

    type of engine is commonly used in passenger cars today.

    - The scope of the study is to consider and evaluate the process

    of fuel injection, formation of mixture, combustion process, performance

    and pollution emissions of spark ignition engines using gasohol fuel

    according to the operating condition. The proportion of ethanol in gasohol

    will be changeable over a wide range.

  • -2-

    4. Research content

    - The simulation models are built based on theoretical of

    computation fluid dynamic (CFD) and Ansys-Fluent software.

    - The experimental system is built to measure and evaluate

    performance and pollution emissions of the engine.

    - The simulation model is adjusted according to experimental

    results, then simulation model is developed to expand the scope of the

    research.

    5. Research method

    Simulations and experiments are used simultaneously for this

    research.

    6. The significance of scientific and practical

    Simulation model of the thesis is the scientific basis of applying

    Ansys-Fluent software in calculating the ignition engine operating cycle

    using multiple fuels. Calculation results from the model allow analysis

    and assessment of the course of the fuel injection process, the formation

    of mixture, and the combustion process in gasoline injection and spark

    ignition engines. Simulation results of evaporation, mixture formation

    and combustion process are the scientific basis for calibrating engine of

    electronically controlled ignition and injection, which uses gasohol fuel

    with high ethanol content.

    Experimental results on the performance of the engine using

    gasohol indicate the high range of ethanol ratio can be apply on engine of

    passenger cars, which has confirmed the feasibility in realizing the

    objectives of the bio-fuel roadmap under the Prime Minister's Decision

    53/2012 / QD-TTg.

    Therefore, the thesis contributes to ensuring national energy

    security and fulfilling Vietnam's commitment at COP21 in dealing with

  • -3-

    global warming.

    7. Structure of the thesis

    In addition to the introduction and conclusion, the content of the

    thesis is divided into 4 chapters, presenting the following main contents:

    Chapter 1 - Overview, Chapter 2 - Theoretical foundations, Chapter 3 -

    Experimental research and Chapter 4 - Simulation research.

    8. New contributions of the thesis

    - Successfully building a 3D-CFD model of a gasoline engine,

    allowing analysis of the fuel injection process, fuel-air mixture

    characteristics and combustion process in the gasoline injection engine,

    for both gasoline - ethanol blended injection and separate

    gasoline/ethanol injection.

    - Proposing a dual gasoline / ethanol injection solution applied to

    gasoline port fuel injection engines or direct injection engines. It is not

    only satisfying the complete evaporation capacity of ethanol at high ratio

    but also helps to stratified octane number of mixtures at the end of the

    compression process in the cylinder of engine.

    Chapter 1. OVERVIEW

    1.1. Using renewable fuels on automobile engines

    1.1.1. Practical requirements towards using biofuels

    Use of biofuels in general and ethanol request comes from energy

    security, reduce pollution and CO2 emission reduction commitments

    under the COP21 of the countries in the world including Vietnam.

    1.1.2. Combustion technology uses two fuels as a suitable solution

    towards the use of biofuels on internal combustion engines

    The scientific community is moving towards the concept of

    advanced combustion, including combustion compression with a

  • -4-

    homogeneous mixture (HCCI), Reactivity Controlled Compression

    Ignition (RCCI) and Partially premixed combustion (PPC). These

    combustion technologies important roles of alternative fuels such as

    ethanol, methanol, natural gas, ...

    1.1.3. The situation of biofuel production in the world and in Vietnam

    Ethanol dominates today's biofuel market thanks to its ability to

    produce on an industrial scale and be environmentally friendly compared

    to other alcohols.

    Vietnam is an agricultural country, agricultural waste products are

    plentiful, especially in cassava, corn and sugarcane production areas ...

    Vietnam currently has more than 50 domestic sugar factories with a total

    capacity of nearly 100,000 tons sugarcane per day, it is possible that

    Vietnam can produce up to 100 million liters of alcohol each year.

    "The project of developing biofuels to 2015 and vision to 2025" of

    the Government of Vietnam has promoted the amount of ethanol

    produced domestically to meet E5 fuel to replace RON92 gasoline

    nationwide in the period over time. This is the premise towards ethanol

    production in the country to meet the demand for ethanol to blend E10,

    E15 and E20 fuels to replace RON92 gasoline in the coming time.

    1.2. Situation of research on using gasohol fuel on spark ignition

    engines

    Typically, gasohol fuel is created by directly mixing ethanol with

    gasoline. When using gasohol fuel with ethanol ratio not exceeding E20,

    engine performance is not only guaranteed but also significantly reduces

    CO, HC and CO2 emissions compared to conventional gasoline.

    Application of ethanol as a fuel for internal combustion engines by direct

    injection of ethanol into the combustion chamber or by the separate

    injection of gasoline / ethanol on the port intake can not only solve the

  • -5-

    renewable fuel source, but also take advantage of the benefits of ethanol

    to improve engine efficiency, reduce CO, HC, CO2 emissions and limit

    NOx increase compared to port gasoline-ethanol mixture injection

    traditional.

    Conclusion chapter 1

    Ethanol is a renewable biofuel, suitable to replace gasoline fuel on

    the current means of transportation. In addition, the production and use

    of ethanol do not emit CO2 in the carbon cycle, contributing to the fight

    against global warming according to the COP21 joint statement.

    Currently, Vietnam has ethanol factories that can meet the amount

    of ethanol blended with E5 biofuel to replace RON92 gasoline

    nationwide. Besides, with the policy mechanism from "Project of

    developing biofuels to 2015, vision to 2025" will create conditions to

    increase ethanol production to meet blends E10, E15 and E20 biofuel

    instead replace E5 in the future.

    To exploit the advantages and overcome the significant

    disadvantages of ethanol fuel when used on gasoline engines, it is

    necessary to study different fuel injection solutions because they are the

    main factors affecting the evaporation, mixture formation and formati