VECOM Low Temperature Combustion

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Increasing Compression Ratio Increasing CR beyond 12-14 provides little efficiency gain: • Increased heat losses (higher surface area to volume ratio) • Decreased combustion efficiency (fuel trapped in crevices, quenching) Furthermore, increased CR: • Requires higher octane fuel (expensive) • Requires stronger engine structure (high peak cylinder pressure) Conclusion: Increasing CR beyond current range for naturally aspirated engines (10.5-11.5) does not have the potential for large improvements in efficiency. <strong>VECOM</strong> Workshop 18 Prague, March 14-15 2012
Otto Efficiency (%) 1 1 CR Increasing Ratio of Specific Heats ( 1) C C p v 65 60 CR=11 55 50 45 40 35 1.20 1.22 1.24 1.26 1.28 1.30 1.32 1.34 1.36 1.38 1.40 C p /C v (-) <strong>VECOM</strong> Workshop 19 Prague, March 14-15 2012
Page 1 and 2: Low Temperature Combustion Stanisla
Page 3 and 4: My research interests: Using thermo
Page 5 and 6: Outline • Why consider low temper
Page 7 and 8: Normal (High) Temperature Combustio
Page 9 and 10: Tools for studying LTC VECOM Worksh
Page 11 and 12: Improving efficiency with LTC VECOM
Page 13 and 14: Carnot Cycle Efficiency For a gasol
Page 15 and 16: Otto Cycle Efficiency 1 1 CR ( 1)
Page 17: Increasing Compression Ratio - Real
Page 21 and 22: Increasing Ratio of Specific Heats
Page 23 and 24: Real Engine Effects Real engines do
Page 25 and 26: Engine Model - Operating Conditions
Page 27 and 28: Effect of Phi on Naturally Aspirate
Page 29 and 30: Effect of Phi on Boosted Engine Eff
Page 31 and 32: Ignition and combustion constraints
Page 33 and 34: Ignition and Combustion with LTC Co
Page 35 and 36: Ignition and Combustion with Natura
Page 37 and 38: Combustion Phasing The simulations
Page 39 and 40: Ringing and misfire limits VECOM Wo
Page 41 and 42: HCCI Ringing Limit HCCI and SACI ca
Page 43 and 44: HCCI Ringing Limit Three commonly u
Page 45 and 46: HCCI Ringing Limit 3) Combustion No
Page 47 and 48: HCCI Ringing Limits Comparison of t
Page 49 and 50: IMEP g [kPa] Combining HCCI Ringing
Page 51 and 52: Emissions from HCCI VECOM Workshop
Page 53 and 54: Emissions from HCCI We’ll conside
Page 55 and 56: Emissions from HCCI Smoke Meter PM
Page 57 and 58: Emissions from HCCI NO x Emissions
Page 59 and 60: PM (mg/m3) PM Emissions from HCCI 4
Page 61 and 62: Summary • Significant efficiency
Page 63 and 64: Future challenges 1. Optimization o
Page 65 and 66: Outline • Why consider low temper
Page 67 and 68: Conventional Diesel Combustion Good
Page 69 and 70:
Reducing emissions with diesel LTC
Page 71 and 72:
Phi - T Diagram Soot 1600-2400K Ide
Page 73 and 74:
Diesel LTC Concept Reduce PM and NO
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Experimental Setup Engine Manufactu
Page 77 and 78:
Implementation of LTC on a diesel e
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Implementation of LTC on a Diesel E
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Operating Conditions Lean Conv. Lea
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Engine-Out HC Composition by Carbon
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Late-Forming Species (Engine-Out) R
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DOC Conversion Efficiency VECOM Wor
Page 97 and 98:
Why Does the DOC Perform Poorly wit
Page 99 and 100:
Why Does the DOC Perform Poorly wit
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Summary VECOM Workshop 101 Prague,
Page 103 and 104:
Future challenges VECOM Workshop 10
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Thank you for your attention! E-mai
Page 107 and 108:
Acknowledgements - Projects • Mar
Page 109:
Selected Diesel LTC References Nort
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VECOM Low Temperature Combustion

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