Troels Dyhr Pedersen.indd - Solid Mechanics

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Page 13 of 22 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 7: Cyl. pressure, DME + EGR at 1800 RPM 250 200 150 100 50 MEOH=0.024 DME only MEOH=0.095 MEOH=0.117 MEOH=0.067 0 CAD -25 -20 -15 -10 -5 0 5 10 15 Pressure [MPa] MEOH=0.120 Figure 8: Heat release, DME + MEOH at 1000 RPM 250 200 150 100 50 DME only MEOH=0.07 0 MEOH=0.048 MEOH=0.022 MEOH=0.076 0 CAD -25 -20 -15 -10 -5 0 5 10 15 Figure 9: Heat release, DME + MEOH at 1800 RPM Heat release [J/CAD] Heat release [J/CAD]
Page 14 of 22 250 200 150 100 50 40 % EGR No EGR 50 % EGR 60 % EGR 65 % EGR 70 % EGR 0 CAD -25 -20 -15 -10 -5 0 5 10 15 Figure 10: Heat release, DME + EGR at 1000 RPM 250 200 150 100 50 40 % EGR No EGR COMPARISON WITH SIMULATIONS 50 % EGR 60 % EGR 65 % EGR 70 % EGR 0 CAD -25 -20 -15 -10 -5 0 5 10 15 Figure 11: Heat release, DME + EGR at 1800 RPM A 0-D CHEMKIN II simulation was made for the 1000 RPM tests. The CHEMKIN model used was the 0-D closed homogeneous IC engine reactor. The model was setup with the same parameters as the engine tested. Heat transfer was modeled with the built-in Woschni correlation. For the experiment with methanol, mole fractions of methanol and DME identical to those used in the test were implemented in a parameter study. The reactor initial temperature was decreased with increasing equivalence ratio of methanol according to figure 1. The result of the simulation has been plotted in figure 12. Heat release [J/CAD] Heat release [J/CAD]
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Homogeneous Charge Compression Igni
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- 2 - - Table of contents 1 FOREWOR
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- 4 - - 11.5.3 Filtering of sample
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- 6 - - 1 Foreword The work describ
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3 Résumé - 8 - - This thesis is b
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4 Resumé (dansk) - 10 - - Denne af
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5 Introduction - 12 - - 5.1 About H
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- 14 - - 5.3 Scope of investigation
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6 The basics of HCCI combustion - 1
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- 18 - - the cylinder. In HCCI comb
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7 Combustion of DME - 20 - - 7.1 Co
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- 22 - - 8 Description of experimen
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- 24 - - 8.1.3 Piston modifications
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- 26 - - combustion event is often
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- 28 - - however not possible, sinc
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- 30 - - (excess air ratio 3) of ai
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dQ dt = h ⋅ A ⋅ - 32 - - ( T
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- 34 - - In addition, many reaction
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- 36 - - Arrows in the scheme indic
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- 38 - - formaldehyde (CH2O) and fo
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Figure 12: Termination of the low t
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- 42 - - The non-carbon radical act
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10.7 List of species Radicals of hy
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- 46 - - If a frequency analysis of
Page 50 and 51:
- 48 - - 11.5.3 Filtering of sample
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- 50 - - The SPL of the cylinder pr
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Figure 17: Intensity chart for cyli
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- 54 - - 11.7.3 Axial modes Axial w
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- 56 - - A case was set up to make
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12 Simulation of detonation phenome
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- 60 - - provided more ideal condit
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- 62 - - positive in the x- directi
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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 and 116: With EGR there was a notable change
Page 117: Page 12 of 22 9 8 7 6 5 4 3 2 MEOH
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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