A Laboratory Combustion Study of Diesel Particulates Containing Metal Additives

McCabe, Robert W.; Sinkevitch, Robert M.

doi:10.4271/860011

Cited by 23 publications

(13 citation statements)

References 6 publications

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“…The wall temperature above which no significant deposits exist is not known precisely. Reported values of the ignition temperature of soot particles [42,43] ranged from 620 to 870 K, although the ignition temperature could be lowered substantially with additives [42,44,45]. Nevertheless these results suggest the possibility that a decrease in the thickness of wall deposits with increasing wall temperature may be the cause of the measured increase in the transient surface heat flux during combustion with increasing wall temperature.…”

Section: A C Alkidascontrasting

confidence: 43%

Discussion: “Heat Transfer With Insulated Combustion Chamber Walls and Its Influence on the Performance of Diesel Engines” (Woschni, G., and Spindler, W., 1988, ASME J. Eng. Gas Turbines Power, 110, pp. 482–488)

Borman

1988

Journal of Engineering for Gas Turbines and Power

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increase in bsfc -% engine speed [rpml The turbocompounded engine with insulated pistons would eliminate this gain in consumption, which means that the compounded engine with insulated pistons is inferior to the turbocharged engine with bare aluminum pistons over the whole engine map, as can be seen from Fig. 15. ConclusionFurther experiments confirmed the fact presented in [1] that insulation of the combustion chamber yields savings in fuel consumption only at low load, if ever. The reason is that only for relatively low surface temperatures of the combustion chamber walls do the heat losses through the combustion chamber walls decrease according to the decreasing temperature difference between gas and surface. With higher surface temperatures the heat transfer coefficient rises rapidly, so the positive effect of the decreasing temperature difference is overcompensated. The possible gain in fuel consumption at part load in any case is paid for dearly with a significant fuel consumption increase at full load. This holds true for the naturally aspirated engine as well as for the turbocharged engine without and with an additional power turbine.

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Section: A C Alkidascontrasting

confidence: 43%

Discussion: “Heat Transfer With Insulated Combustion Chamber Walls and Its Influence on the Performance of Diesel Engines” (Woschni, G., and Spindler, W., 1988, ASME J. Eng. Gas Turbines Power, 110, pp. 482–488)

Borman

1988

Journal of Engineering for Gas Turbines and Power

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“…Here one must mention first the classical work of Bissett and Shadman (1985) with a zero-dimensional model, along with its extension to a one-dimensional (1-D) model of a trap channel (Bissett, 1984). However, only relatively limited application of this model to real-world applications has been presented so far (McCabe and Sinkevitch, 1986). Other researchers also presented regeneration models 1 later on (Gamer and Dent, 1988;Pattas and Samaras, 1989;I Pauli et al, 1984).…”

Section: Modeling Thermal Trap Regenerationmentioning

confidence: 99%

Modeling thermal regeneration of wall‐flow diesel particulate traps

Koltsakis

Stamatelos

1996

AIChE Journal

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“…Following this shift the maximum DPF temperature is a monotonic increasing function of the filtration velocity. Eventually this trend is reversed 46, 47. All the experiments reported here were conducted under conditions that an increase in either the feed temperature, the oxygen concentration, or the filtration velocity increased the DPF temperature under stationary operation.…”

Section: Introductionmentioning

confidence: 96%

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Chen¹,

Martirosyan²,

Luss³

2010

AIChE Journal

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A major technological challenge in the regeneration of diesel particulate filters (DPFs) is that sometimes local high temperature excursions melt the cordierite ceramic filter. The cause of this melting is still an open question as the highest temperature attained under stationary (constant feed) combustion of the accumulated particulate matter is too low to cause this melting (melting temperature $1250 C). We recently conjectured that the high temperature excursions are a counterintuitive response to a rapid deceleration, which decreases the exhaust gas temperature and flow rate and increases the oxygen concentration. Infrared measurements of the spatiotemporal temperature during soot combustion on a single-layer DPF showed that a simultaneous step change of the feed temperature, flow rate, and oxygen concentration can lead to a transient temperature that exceeds the highest attained for stationary operation under either the initial or the final operation conditions. The experiments revealed that the magnitude of the temperature rise depends in a complex way on several factors, such as the direction of movement of the propagating temperature front. The amplitude of the temperature rise is a monotonic decreasing function of the distance that the temperature front moved before the step change. The rapid response to the feed oxygen concentration increases initially the moving front temperature. The slow response of the ceramic DPF to a decrease in the feed temperature may eventually decrease the moving front temperature and even lead to premature extinction and partial regeneration.

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A Laboratory Combustion Study of Diesel Particulates Containing Metal Additives

Cited by 23 publications

References 6 publications

Discussion: “Heat Transfer With Insulated Combustion Chamber Walls and Its Influence on the Performance of Diesel Engines” (Woschni, G., and Spindler, W., 1988, ASME J. Eng. Gas Turbines Power, 110, pp. 482–488)

Discussion: “Heat Transfer With Insulated Combustion Chamber Walls and Its Influence on the Performance of Diesel Engines” (Woschni, G., and Spindler, W., 1988, ASME J. Eng. Gas Turbines Power, 110, pp. 482–488)

Modeling thermal regeneration of wall‐flow diesel particulate traps

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

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