Troels Dyhr Pedersen.indd - Solid Mechanics

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Page 11 of 22 Mode HCCI DME+ MEOH HCCI DME+ MEOH HCCI DME+ EGR HCCI DME+ EGR Speed 1000 1800 1000 1800 Torque [Nm] 150 161 75 81 Power [kW] 15.7 30.3 7.9 15.3 BMEP [kPa] 412 443 206 223 e 0.36 0.37 0.33 0.29 Bsfc [g/kWh] 235 230 260 290 Table 4: Performance of the engine in DI CI mode
Page 12 of 22 9 8 7 6 5 4 3 2 MEOH=0.024 DME only MEOH=0.067 MEOH=0.095 MEOH=0.120 MEOH=0.117 1 CAD -25 -20 -15 -10 -5 0 5 10 15 Figure 4: Cyl. pressure, DME + MEOH at 1000 RPM 9 8 7 6 5 4 3 2 DME only MEOH=0.048 MEOH=0.022 MEOH=0.070 MEOH=0.076 1 CAD -25 -20 -15 -10 -5 0 5 10 15 Figure 5: Cyl. pressure, DME + MEOH at 1800 RPM 9 8 7 6 5 4 3 2 40 % EGR No EGR 50 % EGR 60 % EGR 70 % EGR 65 % EGR 1 CAD -25 -20 -15 -10 -5 0 5 10 15 Figure 6: Cyl. pressure, DME + EGR at 1000 RPM Pressure [MPa] Pressure [MPa] Pressure [MPa]
Page 1:
Homogeneous Charge Compression Igni
Page 4 and 5:
- 2 - - Table of contents 1 FOREWOR
Page 6 and 7:
- 4 - - 11.5.3 Filtering of sample
Page 8 and 9:
- 6 - - 1 Foreword The work describ
Page 10 and 11:
3 Résumé - 8 - - This thesis is b
Page 12 and 13:
4 Resumé (dansk) - 10 - - Denne af
Page 14 and 15:
5 Introduction - 12 - - 5.1 About H
Page 16 and 17:
- 14 - - 5.3 Scope of investigation
Page 18 and 19:
6 The basics of HCCI combustion - 1
Page 20 and 21:
- 18 - - the cylinder. In HCCI comb
Page 22 and 23:
7 Combustion of DME - 20 - - 7.1 Co
Page 24 and 25:
- 22 - - 8 Description of experimen
Page 26 and 27:
- 24 - - 8.1.3 Piston modifications
Page 28 and 29:
- 26 - - combustion event is often
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- 28 - - however not possible, sinc
Page 32 and 33:
- 30 - - (excess air ratio 3) of ai
Page 34 and 35:
dQ dt = h ⋅ A ⋅ - 32 - - ( T
Page 36 and 37:
- 34 - - In addition, many reaction
Page 38 and 39:
- 36 - - Arrows in the scheme indic
Page 40 and 41:
- 38 - - formaldehyde (CH2O) and fo
Page 42 and 43:
Figure 12: Termination of the low t
Page 44 and 45:
- 42 - - The non-carbon radical act
Page 46 and 47:
10.7 List of species Radicals of hy
Page 48 and 49:
- 46 - - If a frequency analysis of
Page 50 and 51:
- 48 - - 11.5.3 Filtering of sample
Page 52 and 53:
- 50 - - The SPL of the cylinder pr
Page 54 and 55:
Figure 17: Intensity chart for cyli
Page 56 and 57:
- 54 - - 11.7.3 Axial modes Axial w
Page 58 and 59:
- 56 - - A case was set up to make
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12 Simulation of detonation phenome
Page 62 and 63:
- 60 - - provided more ideal condit
Page 64 and 65:
- 62 - - positive in the x- directi
Page 66 and 67: 3,0 x 10 6 2,5 x 10 6 2,0 x 10 6 1,
Page 68 and 69: - 66 - - A detailed drawing of the
Page 70 and 71: - 68 - - In the expressions above,
Page 72 and 73: ( 21) ( 22) - 70 - - The mach numbe
Page 74 and 75: ( 25) - 72 - - Δt v = u ⋅ Δx wh
Page 76 and 77: - 74 - - Figure 29: Development in
Page 78 and 79: - 76 - - 12.5 Observations of deton
Page 80 and 81: - 78 - - On figure 34, the individu
Page 82 and 83: - 80 - - • The engine load obtain
Page 84 and 85: - 82 - - 15. Takayugi Tsuchiya, Yos
Page 86 and 87: - 84 - - 15 Appendix A: Reduced sch
Page 88 and 89: 16 Appendix B: Detonation model in
Page 90 and 91: - 88 - - 17 Paper I: The Effect of
Page 92 and 93: - 90 - - 19 Paper III: Reducing HCC
Page 94 and 95: DESCRIPTION OF THE EXPERIMENT OBJEC
Page 96 and 97: Engine modification To obtain a low
Page 98 and 99: Pressure [Mpa] 6 5 4 3 2 1 lambda 2
Page 100 and 101: Pressure [Mpa] 6 5 4 3 2 1 lambda 4
Page 102 and 103: At lambda 4, IMEP peaks at a compre
Page 104: CONCLUSION • It was possible to a
Page 107 and 108: close to the lean limit. HC is comp
Page 109 and 110: Reactions do however not stop entir
Page 111 and 112: METHANOL TEST PROCEDURE In the firs
Page 113 and 114: Page 8 of 22 0 -5 -10 -15 -20 -25
Page 115: With EGR there was a notable change
Page 119 and 120: Page 14 of 22 250 200 150 100 50 40
Page 121 and 122: EMISSIONS The emissions in table 6
Page 123 and 124: Page 18 of 22 15 12 9 6 3 0 1000 RP
Page 125 and 126: REFERENCES 1. Mingfa Yao: An Invest
Page 127 and 128: PM: Particulate matter THC: Total H
Page 129 and 130: Coupling of pressure waves and reac
Page 131 and 132: chambers which often have this flat
Page 133 and 134: The two piston crowns with chambers
Page 135 and 136: Page 8 of 21 Figure 10: Steel plate
Page 137 and 138: Page 10 of 21 16.7 kW @ 3000 rpm 17
Page 139 and 140: v v, ref T T ref with T and Tref be
Page 141 and 142: dB higher than the 8 cylindrical ch
Page 143 and 144: Page 16 of 21 Flat chamber 7 BTDC 3
Page 145 and 146: Page 18 of 21 diesel type chamber 3
Page 147 and 148: CONCLUSION HCCI combustion generate
Page 150: DTU Mechanical Engineering Section
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Troels Dyhr Pedersen.indd - Solid Mechanics

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