Etude de la combustion de gaz de synthèse issus d'un processus de ...

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Numerical simulation of a syngas-fuelled engine 1200 1000 Volume (cm3) 800 600 400 200 Experimental Polynomial 0 180 210 240 270 300 330 360 390 420 450 480 510 540 Crank Angle (degrees) tel-00623090, version 1 - 13 Sep 2011 Figure 6.7 – In-cylinder volume polynomial fitting: compression and expansion of downdraft syngas with ignition 12.5 ms BTDC. For this reason, the volume fitting function was divided into two parts one for compression and another for expansion reducing the fitting error to 0.5%. 6.2.2.3 Heat transfer A common practice in engine testing for combustion diagnostic is, prior to the usual firing tests, to test the engine in motored conditions, with air as the only working gas, and the in-cylinder pressure being recorded by a piezoelectric transducer (Lapuerta et al., 2003). The study of the compression process in a RCM operating without combustion is useful to identify different parameters related with its operation, namely the heat transfer to the walls. Once determined, these parameters can also be used during the usual firing cycle. In fact, a determinant parameter in the code is the heat transfer coefficient, which should be calibrated. The pressure signals of single compression are used to determine the heat transfer on the RCM. Figure 6.8 shows the comparison between experimental and numerical in-cylinder pressure without combustion. 184
Chapter 6 40 Experimental 30 Numerical Pressure (bar) 20 10 0 180 210 240 270 300 330 360 Crank Angle (degrees) tel-00623090, version 1 - 13 Sep 2011 Figure 6.8 - Comparison between experimental and numerical in-cylinder pressure during compression of downdraft syngas without combustion. From figure 6.8 is seen that the Woschni model works well in its original formulation and represent the heat transfer of the RCM compression stroke. 6.3.2.4 Turbulent burning velocity As reported in section 3.2.5 the turbulence intensity was experimentally determined for the RCM, and was implemented in the code in the expression (6.26) for validation proposes. The laminar burning velocity formulation obtained in the section 4.1.2.3 was also used to close expression (6.26). 6.3.2.5 Results and discussion Figures 6.9-6.10 show experimental and numerical cylinder pressure for typical downdraft syngas-air mixture and methane-air mixture for various ignition timings, respectively. 185
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THÈSE Pour l’obtention du Grade
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Acknowledgements Acknowledgements T
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Résumé __________________________
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Nomenclature Nomenclature Roman tel
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Nomenclature Subscripts tel-0062309
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Contents tel-00623090, version 1 -
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Contents 6.4. SYNGAS FUELLED-ENGINE
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Introduction CHAPTER 1 INTRODUCTION
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Introduction proves to have higher
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Introduction Chapter 3 - Experiment
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Bibliographic revision CHAPTER 2 BI
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Bibliographic revision point today
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Bibliographic revision - Boudouard
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Bibliographic revision Table 2.1 -
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Bibliographic revision Biomass Dryi
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Bibliographic revision Circulating
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Bibliographic revision or eliminate
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Bibliographic revision established
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Bibliographic revision Hydrogen Hyd
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Bibliographic revision of low moist
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Bibliographic revision scrubbing an
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Bibliographic revision suggests tha
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Bibliographic revision 1 d( δ A) 1
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Bibliographic revision Since n is
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Bibliographic revision 2 ( rsr ) 2
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Bibliographic revision This evoluti
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Bibliographic revision The burning
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Bibliographic revision δVG = − a
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Bibliographic revision 2 1 − −
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Bibliographic revision where the su
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Bibliographic revision the stretche
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Bibliographic revision burning velo
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Experimental set ups and diagnostic
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Chapter 4 CHAPTER 4 EXPERIMENTAL AN
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Chapter 4 4.1 Laminar burning veloc
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Chapter 4 4.1.1.1 Flame morphology
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Chapter 4 P i = 1.0 bar, Ti = 293 K
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Chapter 4 Figure 4.5 shows schliere
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Chapter 4 P i = 2.0 bar, T i = 293
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Chapter 4 Sn (m/s) 3.0 2.5 2.0 1.5
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Chapter 4 5 ms 10 ms 15 ms 20 ms 25
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Chapter 4 behaviour of the curves r
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Chapter 4 1.50 Sn (m/s) 1.25 1.00 0
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Chapter 4 0.5 0.4 φ =1.0 Su (m/s)
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Chapter 4 variation of the normaliz
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Chapter 4 4.1.1.6 Comparison with o
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Chapter 4 The values of laminar bur
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Chapter 4 Pressure (bar) 7 6 5 4 3
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Chapter 4 0.5 0.4 φ=1.2 Su (m/s) 0
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Chapter 4 0.3 φ=0.8 Su (m/s) 0.2 0
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Chapter 4 a minimum pressure to exp
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Chapter 4 Notice the similar behavi
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Chapter 4 A very good agreement bet
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Chapter 4 ( ) Q = h T − T (4.21)
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Chapter 4 tel-00623090, version 1 -
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Chapter 4 are tested and discussed.
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Chapter 4 7 500 Pressure (bar) 6 5
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Page 139 and 140: Chapter 4 4.2.3.4 Quenching distanc
Page 141 and 142: Chapter 4 10000 Quenching distance
Page 143 and 144: Chapter 5 CHAPTER 5 EXPERIMENTAL ST
Page 145 and 146: Chapter 5 30 10 25 8 Pressure (bar)
Page 147 and 148: Chapter 5 30 Piston position (mm) 2
Page 149 and 150: Chapter 5 5.1.1.4 In-cylinder press
Page 151 and 152: Chapter 5 estimation of various par
Page 153 and 154: Chapter 5 TDC 1.25 ms 2.5 ms 3.75 m
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Page 159 and 160: Chapter 5 From figure 5.15 is possi
Page 161 and 162: Chapter 5 From figure 5.16 is obser
Page 163 and 164: Chapter 5 80 Pressure (bar) 70 60 5
Page 165 and 166: Chapter 5 80 10 Pmax (bar) 70 60 50
Page 167 and 168: Chapter 5 -5.0 ms -3.75 ms -2.5 ms
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Page 171 and 172: Chapter 6 CHAPTER 6 NUMERICAL SIMUL
Page 173 and 174: Chapter 6 centered at the spark plu
Page 175 and 176: Chapter 6 H 2 O, (3) N 2 , (4) O 2
Page 177 and 178: Chapter 6 For all the above express
Page 179 and 180: Chapter 6 motions within the cylind
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Page 183 and 184: Chapter 6 Heat transfer Wei et al.,
Page 185 and 186: Chapter 6 The calibration coefficie
Page 187: Chapter 6 6.3.2.2 In-cylinder volum
Page 191 and 192: Chapter 6 80 70 60 Numerical Experi
Page 193 and 194: Chapter 6 downdraft syngas than for
Page 195 and 196: Chapter 6 80 23º BTDC 60 29.5º BT
Page 197 and 198: Chapter 6 with experimental results
Page 199 and 200: Conclusions CHAPTER 7 CONCLUSIONS 7
Page 201 and 202: Conclusions radius and time for syn
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Page 207 and 208: References References tel-00623090,
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Page 221 and 222: Appendix A - Overdetermined linear
Page 223 and 224: Appendix A - Overdetermined linear
Page 225 and 226: Appendix B- Syngas-air mixtures pro
Page 227 and 228: Appendix C -Rivère model Heat flux
Page 229 and 230: Appendix C -Rivère model The work
Page 231 and 232: tel-00623090, version 1 - 13 Sep 20
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