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

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Experimental study of engine-like turbulent combustion single compression experiments performed enables to define a typical scattering on less than 4.0 mm (from -13 mm to -17 mm). The TDC position has also some scattering but only of 1 mm (from 419 mm to 420 mm) which could be endorsed to some mechanical deformation imposed by elevated incylinder pressures. Considering a piston stroke of 419 mm, the overall uncertainty of the piston initial position is lower than 1.0%. This jitter on the initial position can be converted to time scale by considering the average piston speed of 9.5 m/s. This conversion gives a maximum value of 0.42 ms. Considering that the volume inside the chamber is obtained from the piston position, the influence of this jitter on the piston position from one experiment to another is then analyzed in figure 5.3 for the case of updraft syngas without combustion in order to tel-00623090, version 1 - 13 Sep 2011 avoid the effect of the spark time scattering. The choice of the same fuel also avoids differences in the polytropic coefficient of the mixture being compressed. In the case shown in the figure 5.3, the difference in the initial piston position is 1.75 mm. It is observed that there is no significant difference on the piston position along time. 450 Piston position (mm) 360 270 180 90 0 90 100 110 120 130 140 Time (ms) Figure 5.3- Piston displacement during single compression of updraft syngas-air. From figure 5.3 it is also observed the evolution in a “stair” mode of the laser piston position signal. As the in-cylinder volume variation is obtained from this signal, therefore a peak detection filter was applied to this signal (figure 5.4). 142
Chapter 5 30 Piston position (mm) 20 10 0 92 93 94 95 96 97 98 99 100 Time (ms) Figure 5.4 – Peak detection filter. 5.1.1.3 Spark time tel-00623090, version 1 - 13 Sep 2011 Spark time is defined by the diagnostic system of the RCM in a time scale. Thus, this signal is independent of the piston displacement. In order to analyze the jitter of the spark time, figure 5.5 shows the three signals for the case of ignition at TDC and in addition the TDC position in a time scale. 6 Voltage (V) Piston position 5 4 3 2 1 Spark 0 135 136 137 138 139 140 141 142 143 144 145 Time (ms) Figure 5.5 – Spark time at TDC and TDC position signals. Analysing the figure 5.5 it is observed that the spark signal varies slightly (
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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
Page 95 and 96: Chapter 4 P i = 1.0 bar, Ti = 293 K
Page 97 and 98: Chapter 4 Figure 4.5 shows schliere
Page 99 and 100: Chapter 4 P i = 2.0 bar, T i = 293
Page 101 and 102: Chapter 4 Sn (m/s) 3.0 2.5 2.0 1.5
Page 103 and 104: Chapter 4 5 ms 10 ms 15 ms 20 ms 25
Page 105 and 106: Chapter 4 behaviour of the curves r
Page 107 and 108: Chapter 4 1.50 Sn (m/s) 1.25 1.00 0
Page 109 and 110: Chapter 4 0.5 0.4 φ =1.0 Su (m/s)
Page 111 and 112: Chapter 4 variation of the normaliz
Page 113 and 114: Chapter 4 4.1.1.6 Comparison with o
Page 115 and 116: Chapter 4 The values of laminar bur
Page 117 and 118: Chapter 4 Pressure (bar) 7 6 5 4 3
Page 119 and 120: Chapter 4 0.5 0.4 φ=1.2 Su (m/s) 0
Page 121 and 122: Chapter 4 0.3 φ=0.8 Su (m/s) 0.2 0
Page 123 and 124: Chapter 4 a minimum pressure to exp
Page 125 and 126: Chapter 4 Notice the similar behavi
Page 127 and 128: Chapter 4 A very good agreement bet
Page 129 and 130: Chapter 4 ( ) Q = h T − T (4.21)
Page 131 and 132: Chapter 4 tel-00623090, version 1 -
Page 133 and 134: Chapter 4 are tested and discussed.
Page 135 and 136: Chapter 4 7 500 Pressure (bar) 6 5
Page 137 and 138: Chapter 4 Pressure (bar) 7 6 5 4 3
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: Chapter 5 30 10 25 8 Pressure (bar)
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
Page 155 and 156: Chapter 5 Piston position (mm) 500
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
Page 169 and 170: Chapter 5 observation emphasis the
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
Page 183 and 184: Chapter 6 Heat transfer Wei et al.,
Page 185 and 186: Chapter 6 The calibration coefficie
Page 187 and 188: Chapter 6 6.3.2.2 In-cylinder volum
Page 189 and 190: Chapter 6 40 Experimental 30 Numeri
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
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Chapter 6 with experimental results
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Conclusions CHAPTER 7 CONCLUSIONS 7
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Conclusions radius and time for syn
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Conclusions conditions, therefore s
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Conclusions tel-00623090, version 1
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References References tel-00623090,
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References tel-00623090, version 1
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Appendix A - Overdetermined linear
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Appendix A - Overdetermined linear
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Appendix B- Syngas-air mixtures pro
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Appendix C -Rivère model Heat flux
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Appendix C -Rivère model The work
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tel-00623090, version 1 - 13 Sep 20
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