Design and Simulation of Two Stroke Engines

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Nomenclature NAME SYMBOL UNIT (SI) Coefficients Coefficient of heat transfer, conduction Coefficient of heat transfer, convection Coefficient of heat transfer, radiation Coefficient of friction Coefficient of discharge Coefficient of contraction Coefficient of velocity Coefficient of loss of pressure, etc. Squish area ratio Coefficient of combustion equilibrium Area ratio of engine port to engine duct Dimensions and phvsical quantities area diameter length length of computation mesh mass molecular weight radius time volume force pressure pressure ratio pressure amplitude ratio mass flow rate volume flow rate velocity of gas particle velocity of pressure wave propagation velocity of acoustic wave (sound) Young's modulus wall shear stress gravitational acceleration XIX Ck ch cr Cf cd Cc cs CL c Kr A d X L m M r t V F P P X m V c a a Y X g sq W/mK W/m 2 K W/m 2 K 4 m 2 m m m kg kg/kgmol m s m 3 N Pa kg/s m 3 /s m/s m/s m/s N/m 2 N/m 2 m/s 2
Design and Simulation of Two-Stroke Engines Dimensionless numbers Froude number Grashof number Mach number Nusselt number Prandtl number Reynolds number Energv-. work- and heat-related parameters system energy specific system energy internal energy specific internal energy specific molal internal energy potential energy specific potential energy kinetic energy specific kinetic energy heat specific heat enthalpy specific enthalpy specific molal enthalpy entropy specific entropy work work, specific Engine, physical geometry number of cylinders cylinder bore cylinder stroke bore-to-stroke ratio connecting rod length crank throw swept volume swept volume, trapped clearance volume compression ratio, crankcase compression ratio, geometric compression ratio, trapped speed of rotation speed of rotation XX Fr Gr M Nu Pr Re E e U u u PE pe KE ke Q q H h h S s W w n dbo Lst Cbs J-^cr Let Vsv Vts Vcv CRCC CRg CRt N rpm J J/kg J J/kg J/kgmol J J/kg J J/kg J J/kg J J/kg J/kgmol J/K J/kgK J J/kg mm mm mm mm m 3 m 3 m 3 rev/min rev/min
Page 2 and 3: Design and Simulation of Two-Stroke
Page 4 and 5: A Second Mulled Toast When as a stu
Page 8 and 9: Acknowledgments As explained in the
Page 10 and 11: Table of Contents Nomenclature xv C
Page 12 and 13: Table of Contents 2.10.1 Flow at pi
Page 14 and 15: Table of Contents 3.5.3.1 The use o
Page 16 and 17: Table of Contents 6.1.3 The effect
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Design and Simulation of Two-Stroke
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Design and Simulation ofTwo-Stroke
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Design and Simulation ofTwo'Stroke
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Chapter 4 Combustion in Two-Stroke
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Chapter 4 - Combustion in Two-Strok
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a stratilpl o tions to ivior. If m
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CD 30 -, W 20 - LU CO iS _J LU OC 1
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181 also x3 = — = 0.905 x6 = 2.17
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to be cur .3.20) .3.21) .3.22) for
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3.23) com- :on is hhas has a /eng-
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stroke .3.29) mean me to 3land ssio
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a LU z: en 3 CO a LU z EC D m O ho
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CD 1.2 -i 1.0 - di „„ LU 0.8 cc
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CO —> 111" cc LU < LU _J LU CC £
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Combustion in compression-ignition
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stroke ari more often lseful lental
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lat the ssi ;tribu- ELEVATION VIEWS
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CYLINDER HEAD TYPE IS CENTRAL BORE,
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CO E 50 40 - O O _i Hi > I CO 30 Z)
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CURRENT INPUT DATA FOR 2-STROKE 'SP
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Cylin- PP £ Pa- tics of Paper Chap
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vfitro- ;titi >tants 1970. i(In- Ch
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£2 = Pi P2 I Pi J Chapter 4 - Comb
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CHAINSAW AT 9600 rpm. Chapter 4- Co
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LLI •z. O N -z. 0.21 -, 0.20 DC 0
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Chapter 7 Reduction of Fuel Consump
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Chapter 7 • Reduction of Fuel Con
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Chapter 7 - Reduction of Fuel Consu
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^ s C£ Q 2^ E Q. Q_ z' o ISSI HCEM
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o > z~ Q w CO UJ w g x O z o z o m
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S.S.F.C. , C./SHP-HS Chapter 7 - Re
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0.35 • 0.34 LU ° 0.33 - c 03 DC
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§ 2000
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y, ,6 Chapter 7 - Reduction of Fuel
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Chapter 7- Reduction of Fuel Consum
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INLET FOR r AIR AND FUEL Chapter 7
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o Q_ Ld < CD 15-, 10- Chapter 7 - R
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Chapter 8 Reduction of Noise Emissi
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Chapter 8 • Reduction of Noise Em
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Chapter 8 - Reduction of Noise Emis
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• • / . • Appendix Listing of
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Active radical (AR) combustion and
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initial conditions, assumptions reg
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in two-stroke engine (schematic dia
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exhaust timing control valve, effec
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I Exhaust emissions/exhaust gas ana
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Exhaust systems (continued) untuned
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gas constant/universal gas constant
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in crankcase heat transfer analysis
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Mercury Marine air-assisted fuel in
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I PISTON POSITION (computer program
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local acoustic velocity, 60 local M
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Roots blower in turbocharged/superc
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Scavenging (continued) scavenging e
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Simulation, engine See Computer mod
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temperature vs. crankshaft angle (c
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work per thermodynamic (Otto) cycle
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Design and Simulation of Two Stroke Engines

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