INTERNAL COMBUSTION ENGINES

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Second Edition Fundamentals of INTERNAL COMBUSTION ENGINES Solenoid winding Electrical connection Pintle Valve needle Return spring H.N. Gupta

FUNDAMENTALS OF INTERNAL COMBUSTION ENGINES SECOND EDITION H.N. GUPTA Professor of Mechanical Engineering Indian Institute of Technology (Banaras Hindu University) Varanasi Delhi-110092 2013

FUNDAMENTALS OF INTERNAL COMBUSTION ENGINES, Second Edition H.N. Gupta 2013 by PHI Learning Private Limited, Delhi. All rights reserved. No part of this book may be reproduced in any form, by mimeograph or any other means, without permission in writing from the publisher. ISBN-978-81-203-4680-2 The export rights of this book are vested solely with the publisher. Fifth Printing (Second Edition) ¼ ¼ ¼ January, 2013 Published by Asoke K. Ghosh, PHI Learning Private Limited, Rimjhim House, 111, Patparganj Industrial Estate, Delhi-110092 and Printed by Rajkamal Electric Press, Plot No. 2, Phase IV, HSIDC, Kundli-131028, Sonepat, Haryana.

Contents Preface xvii 1. Introduction to Internal Combustion Engines 1 50 1.1 An Overview 1 1.2 Historical Development 2 1.3 Modern Developments 3 1.4 Engine Classifications 4 1.5Classification of Reciprocating Engines by Application 6 1.6 Classifications of Engines by Cylinder Arrangement 6 1.7 Engine Components 9 1.8 Basic Terminology 14 1.9 Four-stroke Spark-ignition Engine 15 1.10 Valve-timing of Four-stroke SI Engine 17 1.10.1 Inlet Valve 18 1.10.2 Exhaust Valve 18 1.11 Four-stroke Compression Ignition (CI) Engines 19 1.12 Comparison of SI and CI Engines 20 1.13 Two-stroke Engines 21 1.14 Comparison of Four-stroke and Two-stroke Engines 23 1.15Geometry of Reciprocating Engine 24 1.16 Engine Performance Parameters 27 1.16.1 Fuel Power 27 1.16.2 Indicated Power (ip) 27 1.16.3 Brake Power (bp) 28 1.16.4 Friction Power (fp) 29 1.16.5 Indicated Thermal Efficiency (h i ) 29 1.16.6 Brake Thermal Efficiency (h b ) 29 1.16.7 Mechanical Efficiency (h m ) 29 1.16.8 Combustion Efficiency (h c ) 30 1.16.9 Relative Efficiency or Efficiency Ratio (h rel ) 30 1.16.10 Volumetric Efficiency (h v ) 30 1.16.11 Indicated Mean Effective Pressure (imep or p mi ) 31 iii

iv Contents 1.16.12 Brake Mean Effective Pressure (bmep or p mb ) 31 1.16.13Specific Fuel Consumption (sfc) 32 1.16.14 Specific Power, Output per Displacement, Engine Specific Volume and Engine Specific Weight 33 1.16.15 Air/Fuel and Fuel/Air Ratios 33 Review Questions 47 Problems 48 2. Air-Standard Cycles and Their Analysis 51 109 2.1 Introduction 51 2.2 Air-standard Cycle 51 2.3 Carnot Cycle 52 2.4 Stirling Cycle 55 2.5Ericsson Cycle 57 2.6 Lenoir Cycle 59 2.7 Otto Cycle or Constant Volume Cycle 61 2.8 Diesel Cycle 65 2.9 Dual Combustion Cycle 68 2.10 Comparison of Otto, Diesel and Dual Combustion Cycles 71 2.11 Atkinson Cycle 75 2.12 Miller Cycle 78 2.13 Brayton Cycle 81 Review Questions 106 Problems 107 3. Reactive Systems 110 153 3.1 Introduction 110 3.2 Properties of Air 110 3.3 Combustion with Air 111 3.4 Equivalence Ratio 113 3.5Enthalpy of Formation 122 3.6 First Law Analysis for Steady-State Reacting Systems 123 3.7 Enthalpy of Combustion, Internal Energy of Combustion and Heating Values 128 3.8 Adiabatic Combustion Temperature 134 3.9 Dissociation 141 3.10 Chemical Equilibrium 143 Review Questions 150 Problems 151 4. Fuel-Air Cycles and Their Analysis 154 193 4.1 Introduction 154 4.2 Fuel-Air Cycle 154 4.3 Factors Affecting the Fuel-Air Cycle 155 4.3.1 Composition of Cylinder Gases 155 4.3.2 Variation of Specific Heats 156

Contents v 4.3.3 Effect of Dissociation 158 4.3.4 Effect of Number of Molecules 160 4.4 Effect of Engine Variables on the Performance of Fuel-Air Cycles 161 4.5Equilibrium Charts 176 4.5.1 Unburned Mixture Charts 176 4.5.2 Burned Mixture Charts 184 4.5.3Relation between Unburned and Burned Mixtures 186 Review Questions 191 Problems 192 5. The Actual Cycle 194 208 5.1 Introduction 194 5.2 Difference between the Actual cycle and the Fuel-Air Cycle 194 5.2.1 Leakage 195 5.2.2 Imperfect Mixing of Fuel and Air 195 5.2.3Progressive Burning 196 5.2.4 Burning Time Losses 196 5.2.5 Heat Losses to the Cylinder Walls 197 5.2.6 Exhaust Blowdown Loss 197 5.2.7 Fluid Friction 199 5.2.8 Gas Exchange or Pumping Loss 199 5.3 Effect of Engine Variables on Flame Speed 199 5.3.1 Fuel/Air Ratio 200 5.3.2 Inlet Pressure 200 5.3.3 Engine Speed 200 5.3.4 Engine Size 200 5.3.5 Residual Gas 201 5.4 Effect of Spark-Timing on the Actual Cycle of SI Engines 201 5.5 Power and Efficiency of the Actual Cycle 204 5.5.1 Effect of Compression Ratio 204 5.5.2 Effect of Fuel/Air Ratio 205 5.6 Frictional Losses 205 5.7 The Actual Cycle of Compression-ignition Engines 206 5.8 Actual and Fuel-Air Cycles of CI Engines 207 Review Questions 208 6. Combustion in Spark-Ignition Engines 209 253 6.1 Introduction 209 6.2 Normal Combustion 209 6.2.1 Stages of Combustion in SI Engine 210 6.2.2 Flame Speed Pattern 212 6.2.3Finite Heat Release Model for Combustion Process of SI Engine 213 6.2.4 Pressure and Temperature Variation as a Function of Crank Angle 215 6.2.5 Effect of Spark Timing on Indicator Diagram 216 6.2.6 Effect of Fuel/Air Ratio on Indicator Diagram 216

vi Contents 6.3 Factors Affecting Ignition Lag 217 6.3.1 Nature of Fuel and Air/Fuel Ratio 217 6.3.2 Initial Temperature and Pressure 218 6.3.3 Compression Ratio 218 6.3.4 Spark Timing 218 6.3.5 Turbulence and Engine Speed 218 6.3.6 Electrode Gap of Spark Plug 218 6.4 Factors Affecting Combustion in Spark-ignition Engines 219 6.4.1 Composition of the Mixture 219 6.4.2 Load 219 6.4.3Compression Ratio 219 6.4.4 Speed 220 6.4.5 Turbulence and Shape of Combustion Chamber 220 6.4.6 Spark Plug Position 221 6.5Cyclic Variation 221 6.6 Rate of Pressure Rise 222 6.7 Abnormal Combustion Autoignition and Detonation 223 6.8 Detrimental Effects of Knocking 224 6.9 Theories of Knocking 225 6.10 Effect of Engine Variables on Knock 226 6.10.1 Temperature, Pressure and Density Factors 226 6.10.2 Time Factors 228 6.10.3 Composition Factors 229 6.10.4 Effect of Design 231 6.11 Detection of Knocking 232 6.12 Uncontrolled Combustion 233 6.12.1 Preignition 233 6.12.2 Run-on Surface Ignition 234 6.12.3Run-away Surface Ignition 234 6.12.4 Wild Ping 234 6.12.5 Rumble 234 6.13 Combustion Chambers for Spark-ignition Engines 235 6.13.1 Basic Requirements of a Good Combustion Chamber 236 6.14 Combustion Chamber Design Principles 237 6.15Combustion Chamber Optimization Procedure 238 6.15.1 Geometric Considerations 238 6.15.2 Considerations for Cyclic Variations 238 6.15.3 Consideration for Proper Turbulence 239 6.16 Types of Combustion Chamber 239 6.16.1 T-head Type Combustion Chamber 239 6.16.2 L-head Type or Side Valve Combustion Chamber 239 6.16.3 Ricardo Turbulent Head Side Valve Combustion Chamber 240 6.16.4 Overhead-valve or I-head Type Combustion Chamber 242 6.16.5 F-head Type Combustion Chamber 243 6.16.6 Hemispherical Combustion Chamber 243 6.16.7 Piston Cavity Combustion Chamber 244

Contents vii 6.16.8 Combustion Chamber with a Pre-chamber for Lean Burn Engine 245 6.16.9 Future Trends 246 6.17 Octane Requirement 246 Review Questions 250 Problems 253 7. Combustion in Compression-Ignition Engines 254 283 7.1 Introduction 254 7.2 Air Motion in CI Engines 255 7.3 Spray Structure 256 7.4 Stages of Combustion 259 7.5Heat Release Rate 261 7.6 Air/Fuel Ratio in CI Engines 262 7.7 Influence of Various Factors on Delay Period 263 7.8 Combustion Knock in CI Engines 267 7.9 Comparison of Knock in SI and CI Engines 270 7.10 Methods of Controlling Knock in CI Engines 271 7.11 Combustion Chamber for CI Engines 272 7.11.1 Combustion Chamber Characteristics 272 7.11.2 Classification of CI Engine Combustion Chambers 272 7.12 Direct Injection (DI) Engines or Open combustion Chamber Engines 273 7.12.1 Semiquiescent or Low Swirl Open Chamber 273 7.12.2 Medium Swirl Open Chamber 274 7.12.3 High Swirl Open Chamber ( M type) 274 7.13 Indirect-Injection (IDI) Engines or Divided Combustion Chamber Engines 275 7.13.1 Swirl or Turbulent Chamber 275 7.13.2 Precombustion Chamber 277 7.13.3 Air Cells 277 7.13.4 Energy Cells 278 7.14 Comparison of Characteristics of Combustion Chambers of CI Engine 279 7.15Starting Methods and Aids 279 Review Questions 282 8. Fuels for Internal Combustion Engines 284 317 8.1 Introduction 284 8.2 Classification of Fuels 284 8.3 Solid Fuels 285 8.3.1 Brief Description of Solid Fuels 285 8.3.2 Use of Solid Fuels in IC Engines 286 8.4 Liquid Fuels 286 8.4.1 Petroleum Fuels (Petra = rock + oleum = oil) 286 8.4.2 Refining Process of Petroleum 289 8.4.3Petroleum-based Liquid Fuels 291 8.5Liquid Alternative Fuels 292 8.5.1 Benzol 292 8.5.2 Alcohol 292

viii Contents 8.5.3Biodiesel 293 8.5.4 Emulsified Diesel Fuel 294 8.5.5 Acetone 294 8.5.6 Diethyl Ether 294 8.5.7 Vegetable Oils 294 8.6 Gaseous Alternative Fuels 295 8.6.1 Natural Gas 295 8.6.2 Liquified Petroleum Gas (LPG) 295 8.6.3Producer Gas 296 8.6.4 Coal Gas 296 8.6.5 Hydrogen 296 8.6.6 Hythane 297 8.6.7 Dimethyl Ether 298 8.6.8 Biogas 298 8.7 Characteristics of SI Engine Fuels 298 8.7.1 Volatility of Liquid Fuels 299 8.7.2 Effect of Volatility on the Performance of SI Engines 301 8.7.3Sulphur Content 304 8.7.4 Gum Deposits 304 8.7.5 Carburettor Detergent Additives 304 8.7.6 Anti-knock Quality 304 8.8 Characteristics of CI Engine Fuels 305 8.8.1 Ignition Quality 305 8.8.2 Volatility 306 8.8.3Viscosity 306 8.8.4 Specific Gravity 307 8.8.5 Corrosion and Wear 308 8.8.6 Handling Ease 309 8.8.7 Safety 309 8.8.8 Cleanliness 309 8.9 Knock Rating of Fuels 310 8.9.1 Knock Rating of SI Engine Fuels 310 8.9.2 Knock Rating of CI Engine Fuels 313 Review Questions 315 9. Carburettors and Fuel Injection in SI Engines 318 369 9.1 Introduction 318 9.2 Limits of Flammability 318 9.3 Steady-running Mixture Requirements 319 9.3.1 Mixture Requirements for Maximum Power 319 9.3.2 Mixture Requirements for Minimum Specific Fuel Consumption 320 9.3.3 Mixture Requirements for Various Outputs 320 9.3.4 Mixture Requirements for Idling, Cruising and High Power 321 9.4 Transient Requirements 323 9.4.1 Starting and Warm-up Requirements 323 9.4.2 Acceleration Requirement 323 9.5Mixture Requirements in a Multi-cylinder Engine 323

Contents ix 9.6 Carburettor Requirements 324 9.7 A Simple Carburettor 324 9.8 Calculation of the Air/Fuel Ratio for a Simple Carburettor 326 9.9 Air/Fuel Ratio Neglecting the Compressibility of Air 328 9.10 Comments on Air/Fuel Ratio Supplied by a Simple Carburettor 329 9.11 Deficiencies of the Elementary Carburettor 330 9.12 Essential Parts of a Modern Carburettor 330 9.12.1 Choke 330 9.12.2 Main Metering System 331 9.12.3Idling System 334 9.12.4 Accelerating System 336 9.12.5 Economizer System and Power System 336 9.12.6 Antipercolator Valve 337 9.13 Types of Carburettors 337 9.13.1 Down-draught, Up-draught and Horizontal-draught Carburettors 337 9.13.2 Concentric and Eccentric Carburettors 338 9.13.3 Multi-venturi Carburettor 339 9.14 Problems Associated with Carburettors 352 9.14.1 Ice Formation 352 9.14.2 Vapour Lock in Fuel Systems 352 9.14.3 Backfiring or Popping in the Carburettor 353 9.15 Carburettor Drawbacks 353 9.16 Fuel-Injection Systems in SI Engines 353 9.16.1 Single-Point Injection (SPI) 354 9.16.2 Multi-Point Fuel Injection 355 9.16.3 Continuous Injection System 355 9.16.4 Timed Injection System (TIS) 355 9.16.5 Direct Injection 356 9.17 Mechanical Fuel-Injection Systems 356 9.17.1 Continuous Injection System with Mechanical Control 356 9.17.2 Timed Injection System with Mechanical Control 357 9.18 Electronic Fuel-Injection Systems (EFIs) 359 9.18.1 Single-point Throttle Body Injection with Electronic Control 359 9.18.2 Multi-point Port Injection with Electronic Control 359 9.19 Advantages of the Multi-point Fuel-injection System 362 9.20 Disadvantages of the Multi-point Fuel-injection System 363 9.21 Gasoline Direct Injection 364 Review Questions 367 Problems 368 10. CI Engines: Fuel-Injection System 370 410 10.1 Introduction 370 10.2 Requirements of Injection Systems 370 10.3 Injection Systems 371 10.3.1 Air-injection System 371 10.3.2 Airless-or Solid-injection System 372

Fundamentals Of Internal Combustion Engines 25% OFF Publisher : PHI Learning ISBN : 9788120346802 Author : GUPTA, H. N. Type the URL : http://www.kopykitab.com/product/7554 Get this ebook

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