Thermochemistry slides

Thermochemistry slides - ‘5‘ E 30 0. IE 0 G .9 3 g 70 8...

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Unformatted text preview: ‘5‘ E 30 0. IE 0 G .9 3 g 70 8 a X Diesels ‘1’ A 60 o Spark-ignition *1... 50 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Exhaust equivalence ratio FIGURE 3-9 Variation of engine combustion efficiency with fuel/air equivalenoc ratic. 1.4 1.6 OPI IONAI. '— Venl Io , . . . . . . . . . .. Almospere f """"""""" “: ‘ : N02/N0 - : 184 REACIION I v : “5 ° 3 CHA'MBER k A 1 : 5 r2 = c0 E 1 NOx "Om : 3 “2 I 3 CL 3 I '_ Q ' V11 1‘ z i ' v33 Span and F‘OZ’NO ‘ S n and Span and Span and Zero Gases E : Z to Gases Zero Gases Zero Gases Am : ‘ ‘ E M M V14 "5 . . . - H ‘ V7 V1 ‘ ‘ m we ‘ ’ ‘ ‘ 4 V \ v v 4 ~ 0 rs n "0 \ \\ S :eflwmma .5! u 86 V13 ‘ V9 n3 Heated 53mm Pump \ , ls“ §urs.3wl N . “1 H "a § [:2] Sample Probe ‘v‘Nlllfi ’(auuur\\.A\"i\\\\‘-fi V2 F4 F3 V16 Figure 079-1 HEAVY-DUTY EXHAUST GAS SAMPLING AND ANALYTICAL TRNN LEGEND a Particulate Fillet Howmeler Backpressure Regulalor with _. Internal Control Loop Shown Line Pressure Regulator wrlh lnlernal Conlrol L000 Shown —, I i 1 Ball Valve or Equwalenl (Darkened Leg Indicates Common Pr. 49;).le Control or Needle Valve Plug Valve or Equivalent (Cenler Pon is Common) (33:) Heated Area mm an? $33on 21 mm. fl 0.02 SIR: m m m. 0. Q 0 0 0 m :28 0 N w .Q l / O 0 mm _ 0 . 0 m m m m m m m. m 3 2 1 2 1 1 M “Engage”? SHE aOZ .LluLcslrlLilLllL m m m m m 0 1w .§@ 88 Howwcmb “mom TC Crank angle, deg Mole fraction Mole fraction Mole fraction (b) (6) FIGURE '3«10 Mole fractions of equilibrium combustion products of isooctane-air mixtures as a f unction of fuel/air equivalence ratio at 30 atmospheres and (a) 1750 K; (b) . and (c) 2750 K. 2250 K; e¢CBH13+02102+ 0.79N2 3 P=50atm _1 . 10 \Heo CO 002 Mole irac‘lion 1 0’3 : 1000 3000 1000 3000 1000 3000 TemperaturewK Figure 3-1 Composition of octane—air mixtures at equilibrium for different tempera- tures at 4: = 0.8, 1.0, and 1.2. Mole fraction—yi ' 10'3 0.2 Figure 3-2 am. edaceHw + 0.21 02 + 079 N2 H2 0.4 0.6 1.0 2 4 Equivalence ratio-«d: Equilibrium composition of octane-air mixture at Tr: 3000 K, P = 50 TRENDS IN EXHAUST CONST ITUEN T S / / \ / / 0.00 , _ _ 6.5 0.6 0.7 1.! [.3 1.4 LS Exhaust equivalence rat io FIGURE 4—20 Spark-ignition engine exhaust gas composition daxa in mole fractions as a function of fuel/air equiva— ience ratio. Fueis: gasoline and isomane. H/C 2 lo 225. {From D'AHeva and Lovell," Sn’uender," Harrington and Sinking:6 Spindr,” and dazafiom the author ‘5 laboratory at M171) 6000 xs 5 4‘ Measured 0 Calculated 5000 0% EGR 4000 3000 de Concentrations ppm on wet has 2000 '5 .2 ‘2 .3. 1900 E a O 0.8 0.9 1.0 - 1.1 1.2 1.3 1.4 Equivalence ratio Figure 9—19 Measured and calculated exhaust NO concentration as function of equivalence ratio with no EGR (Komiyama and Heywood, 1973)- Repfintcd with permission © 1973- Society 0-8 0‘9 L0 of Automotive Engineers, Inc. 0.0 0.! 0.2 O. 3 0.4 0.5 0.6 0.7 Exhaust equivalence ratio FIGURE 4-22 Exhaust. gas composition from several diesel engines in mole fractions on a dry basis as a function of fuel/air equivalence 1-2:.1.io."_1 ...
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This note was uploaded on 02/01/2012 for the course MECH ENG 333 taught by Professor Drallmeier during the Spring '11 term at Missouri S&T.

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Thermochemistry slides - ‘5‘ E 30 0. IE 0 G .9 3 g 70 8...

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