Design and Simulation of Two Stroke Engines

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Design and Simulation of Two-Stroke Engines gas velocities is well known, and the theory or practice can be found in any textbook on fluid mechanics [3.14]. The comb of pitot tubes shown in Fig. 3.4 can be connected to a variety of recording devices, ranging from the simplest, which would be an inclined water manometer bank, to some automatic data logging system through a switching valve from a pressure transducer. Irrespective of the recording method, the velocity of gas, c, in line with the pitot tube is given by: 4,/Ap~ water m/s (3.2.1) where Apwater is the pitot-static pressure difference in units of mm of water. The engine can be motored at a variety of speeds and the throttle set at various opening levels to vary the value of scavenge ratio, SR. The most important aspect of the resulting test is the shape of the velocity contour map recorded at the open cylinder bore. Jante [3.5] describes various significant types of patterns, and these are shown in Fig. 3.5. There are four velocity contour patterns, (a)-(d), shown as if they were recorded from various loop-scavenged engines with two side transfer ports and one exhaust port. The numerical values on the velocity contours are in m/s units. Jante describes pattern (a) as the only one to produce good scavenging, where the flow is ordered symmetrically in the cylinder about what is often referred to as the "plane of symme- PITOT TUBES CONNECTED TO THE RECORDING INSTRUMENTATION COMB OF PITOT TUBES ENGINE VITH TEST CYLINDER J BEING MOTORED—•* mmt Fig. 3.4 Experimental configuration for Jante test. 220 EXHAUST PORT INLET PORT
(A) SYMMETRICAL PATTERN Chapter 3 - Scavenging the Two-Stroke Engine (B) TONGUE PATTERN (C) V ALL P ATTERN (D) UNSYMMETRIC AL P ATTERN Fig. 3.5 Typcial velocity contours observed in the Jante test. Plate 3.1 A comb ofpitot tubes for the Jante test on a motorcycle engine. 221
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Design and Simulation of Two-Stroke
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A Second Mulled Toast When as a stu
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Acknowledgments As explained in the
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Table of Contents Nomenclature xv C
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Table of Contents 2.10.1 Flow at pi
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Table of Contents 3.5.3.1 The use o
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Table of Contents 6.1.3 The effect
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Nomenclature NAME SYMBOL UNIT (SI)
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speed of rotation speed of rotation
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attenuation or transmission loss wa
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Page 192 and 193: Design and Simulation of Two-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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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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Name F R Chapter 8 • Reduction of
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1 Chapter 8 - Reduction of Noise Em
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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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Pressure wave reflection (in pipes)
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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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