Troels Dyhr Pedersen.indd - Solid Mechanics

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- 6 - - 1 Foreword The work described in this thesis was initiated in June 2006 and completed in January 2010. It was carried out under supervision of associate professor Jesper Schramm at the Department of Mechanical Engineering, Technical University of Denmark. I wish to thank Jesper Schramm for offering me the PhD position. I also wish to thank the rest of the Internal Combustion Engine Group. Everyone has been supportive and helpful in many situations. In 2008 I visited the National Traffic Safety and Environmental Laboratories in Tokyo, Japan, for 5 months. The purpose of the visit was to perform experiments with HCCI combustion on a truck engine test bench. I am grateful for having been given this opportunity to work in a professional environment, and wish to thank the people whom I worked with at NTSEL for their help and kindness.
2 Nomenclature - 7 - - AC Alternating Current ASRT Automatic Scheme Reduction Tool ATAC Active Thermo Atmosphere Combustion ATDC After Top Dead Center BMEP Brake Mean Effective Pressure BTDC Before Top Dead Center CAI Controlled Auto Ignition CCI Combined Combustion System CFD Computational Fluid Dynamics CI Compression Ignition CJ Chapman Jouget DFT Discrete Fourier Transform DI Direct Injection DME Dimethyl Ether EGR Exhaust Gas Recirculation FIR Finite Impulse Response FFT Fast Fourier Transform GCI Gasoline Compression Ignition HCCI Homogenous Charge Compression Ignition HTR High Temperature Reactions IIR Infinite Impulse Response IMEP Indicated Mean Effective Pressure LHV Lower Heating Value LTR Low Temperature Reactions NTSEL National Traffic Safety and Environment Laboratories PCCI Premixed Charge Compression Ignition PCI Premixed Compression Ignition RMS Root Mean Square SI Spark Ignition SPL Sound Pressure Level TDC Top Dead Center ZND Zel´dovich Neumann Döring
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 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
Page 30 and 31: - 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
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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,
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- 66 - - A detailed drawing of the
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- 68 - - In the expressions above,
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( 21) ( 22) - 70 - - The mach numbe
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( 25) - 72 - - Δt v = u ⋅ Δx wh
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- 74 - - Figure 29: Development in
Page 78 and 79:
- 76 - - 12.5 Observations of deton
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- 78 - - On figure 34, the individu
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- 80 - - • The engine load obtain
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- 82 - - 15. Takayugi Tsuchiya, Yos
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- 84 - - 15 Appendix A: Reduced sch
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16 Appendix B: Detonation model in
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- 88 - - 17 Paper I: The Effect of
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- 90 - - 19 Paper III: Reducing HCC
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DESCRIPTION OF THE EXPERIMENT OBJEC
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Engine modification To obtain a low
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Pressure [Mpa] 6 5 4 3 2 1 lambda 2
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Pressure [Mpa] 6 5 4 3 2 1 lambda 4
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At lambda 4, IMEP peaks at a compre
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CONCLUSION • It was possible to a
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close to the lean limit. HC is comp
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Reactions do however not stop entir
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METHANOL TEST PROCEDURE In the firs
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Page 8 of 22 0 -5 -10 -15 -20 -25
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With EGR there was a notable change
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Page 12 of 22 9 8 7 6 5 4 3 2 MEOH
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Page 14 of 22 250 200 150 100 50 40
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EMISSIONS The emissions in table 6
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Page 18 of 22 15 12 9 6 3 0 1000 RP
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REFERENCES 1. Mingfa Yao: An Invest
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PM: Particulate matter THC: Total H
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Coupling of pressure waves and reac
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chambers which often have this flat
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The two piston crowns with chambers
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Page 8 of 21 Figure 10: Steel plate
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Page 10 of 21 16.7 kW @ 3000 rpm 17
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v v, ref T T ref with T and Tref be
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dB higher than the 8 cylindrical ch
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Page 16 of 21 Flat chamber 7 BTDC 3
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Page 18 of 21 diesel type chamber 3
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CONCLUSION HCCI combustion generate
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DTU Mechanical Engineering Section
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