The Effects of Exhaust Back Pressure on Conventional and Low-Temperature Diesel Combustion

Cong, Shenghui; Garner, Colin P.; McTaggart-Cowan, Gordon

doi:10.1177/09544070jauto1577

Cited by 30 publications

(23 citation statements)

References 31 publications

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“…Of the parameters, EGR appears to have had a generally larger influence compared to Fuel Q. This agrees with other LTC results [2], which show a strong sensitivity to EGR at the very high EGR levels needed to achieve low-NOx and low-PM combustion.…”

Section: Half Fractional Factorial Testsupporting

confidence: 89%

“…It was primarily sensitive to EGR rate and secondarily to fuel injection quantity. (2) Smoke emissions showed significant sensitivity to the changes in EGR rate for the intermediate load LTC conditions. The higher combustion temperature and air-fuel ratio under this condition were likely to be close to the soot formation threshold in the (P-T map [19].…”

Section: Discussionmentioning

confidence: 97%

“…The desired EGR rate and EBP were achieved by controlling independently the valve positions for the EGR and EBP valves. The effects of EBP on the combustion process have been reported previously [2].…”

Section: Introductionmentioning

confidence: 95%

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Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

McTaggart-Cowan

Cong

Garner

et al. 2012

Journal of Engineering for Gas Turbines and Power

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This work elucidated which engine operating parameters have the greatest influence on Low temperature diesel combustion (LTC) and emissions. Key parameters were selected and evaluated at low and intermediate speed and load conditions using fractional factorial and Taguchi orthogonal experimental designs. The variations investigated were: about ± 5% in EGR rate, fuel injection quantity and engine speed respectively; and ± we in intake charge temperature. The half-fractional factorial results showed that the interactions among these parameters were negligible for a specific load/speed point. The Taguchi orthogonal method could be used as an efficient DoE tool for studying the multi-parameter 'small-scale transients' that a diesel engine would be likely to encounter when operating in LTC modes. LTC showed the most significant sensitivity to EGR rate variations, where an increase from 60% to 63% in EGR rate doubted THC and CO emissions and reduced combustion stability. LTC was also sensitive to the fuel injection quantity with an increase in injected mass lowering the overall oxygen-fuel ratio and thereby increasing THC and CO emissions. These two parameters influenced the oxygen concentration in the intake charge; which was identified to be a decisive parameter for the LTC combustion and emissions. Intake charge temperature affected the total charge quantity trapped in the cylinder and showed noticeable influence on CO emissions for the low speed intermediate load condition. Variations in engine speed showed a negligible influence on the LTC combustion processes and emissions.

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Section: Half Fractional Factorial Testsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 97%

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Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

McTaggart-Cowan

Cong

Garner

et al. 2012

Journal of Engineering for Gas Turbines and Power

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“…However, the emissions of THC and CO emissions are increased, and engine thermal efficiency and combustion stability are reduced (Cong et al, 2011;Ogawa et al, 2007). These are mainly due to the high level of exhaust gas recirculation (EGR) implemented to realize LTC (Cong et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Low Temperature Diesel Combustion Processes

Cong

McTaggart-Cowan

Garner

et al. 2011

Combustion Science and Technology

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“…Assuming a 2200 K maximum combustion temperature which represents the normal heat release case in diesel engines [20], and a recuperator effectiveness of 0.8, the available compression ratio range is shown in Fig. 2.…”

Section: Brayton Cycle Recuperated Brayton Cyclementioning

confidence: 99%

A novel split cycle internal combustion engine with integral waste heat recovery

2015

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h i g h l i g h t sA novel engine thermodynamic cycle is proposed. Theoretical analysis is applied to identify the key parameters of the thermodynamic cycle.The key stages of the split cycle are analysed via one-dimensional modelling work. The effecting mechanism of the split cycle efficiency is analysed. a b s t r a c tTo achieve a step improvement in engine efficiency, a novel split cycle engine concept is proposed. The engine has separate compression and combustion cylinders and waste heat is recovered between the two. Quasi-isothermal compression of the charge air is realised in the compression cylinder while isobaric combustion of the air/fuel mixture is achieved in the combustion cylinder. Exhaust heat recovery between the compression and combustion chamber enables highly efficient recovery of waste heat within the cycle. Based on cycle analysis and a one-dimensional engine model, the fundamentals and the performance of the split thermodynamic cycle is estimated. Compared to conventional engines, the compression work can be significantly reduced through the injection of a controlled quantity of water in the compression cylinder, lowering the gas temperature during compression. Thermal energy can then be effectively recovered from the engine exhaust in a recuperator between the cooled compressor cylinder discharge air and the exhaust gas. The resulting hot high pressure air is then injected into a combustor cylinder and mixed with fuel, where near isobaric combustion leads to a low combustion temperature and reduced heat transferred from the cylinder wall. Detailed cycle simulation indicates a 32% efficiency improvement can be expected compared to the conventional diesel engines.

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The Effects of Exhaust Back Pressure on Conventional and Low-Temperature Diesel Combustion

Cited by 30 publications

References 31 publications

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

Experimental Investigation of Low Temperature Diesel Combustion Processes

A novel split cycle internal combustion engine with integral waste heat recovery

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