Diesel Combustion and Emission Study by Using of High Boost and High Injection Pressure in a Single Cylinder Engine (Third Report)~Effects of Boost Pressure on Friction Losses

Aoyagi, Yoshinobu; Osada, Hideaki; Misawa, Masahiro; Hirosawa, Tomoaki; Hyodo, Yoshiyuki; Kobayashi, Makiko; Noda, Akira; Ishii, Hajime

doi:10.4271/2005-08-0109

Cited by 10 publications

(11 citation statements)

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“…Note that the EGR cooler does not reduce the temperature down to that of the fresh intake air before it is introduced into the intake manifold. MAT should create different combustion characteristics, such as a shorter ignition delay [32,91] and smaller premix spike [92,93]. It is plausible that since the 2004 Cummins engine implements higher injection pressures, mixing was enhanced, and shorter ignition delays were created [91].…”

Section: Comparison Of Heat Release Between Enginesmentioning

confidence: 99%

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The Effects of Fuel Additives on Diesel Engine Emissions during Steady State and Transient Operation

Nuszkowski¹

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Internal combustion engines have propelled society's transportation and power needs for the last century. However, with the regulatory demand to reduce air pollution, internal combustion engines are a major focus to reduce the emissions from these engines. Compression ignition or diesel engines are a major contributor to NOx and PM pollution. However, the life of these engines is much longer than that of their spark-ignited counterparts, causing the fleet of diesel engines to consist of a significant number of old, higher polluting engines. Fuel additives are one method of reducing emissions and/or enhancing performance in these older diesel engines without the need for technology upgrades (new engines/aftertreatment). Although diesel fuel additives' ability to reduce harmful emissions is well known in the literature, the mechanism as to how these additives work is not well understood. To explore the mechanism, three cetane improvers (2-EHN, DTBP, and ODA) were investigated on a 1992 DDC Series 60 engine and 2004 EGR-equipped Cummins ISM370 engine incorporating sensors for in-cylinder pressure measurement and analysis. The engines were tested on the heavy-duty FTP cycle and the steady state SET test. The cetane improvers, depending on the additive, treat rate, and base fuel (excluding the biodiesel blends), showed significant reduction in NOx (2.2-4.9%) on the 1992 DDC engine and no change or significant increase (1.3-1.4%) on the 2004 Cummins engine when exercised over the transient FTP cycle. In the SET tests, low loads produced a NOx decrease (up to 8%) and high loads a NOx increase (up to 1.8%) with cetane improvers on the 1992 DDC engine. The 2004 Cummins engine showed little NOx decrease (up to 1%) or a NOx increase (up to 6.1%) with cetane improvers compared to the base fuel on the SET test. The biodiesel blends showed a similar trend with the additized neat fuel with decreased NOx at low load and increased NOx at high load on the 1992 DDC engine, suggesting a cetane effect due to the high cetane number of biodiesel. The heat release parameters showed that the change in NOx was due to the change in maximum cylinder pressure, maximum cylinder gas temperature, premix fraction, and pressure at the start of combustion on the 1992 DDC engine. Overall, the fuel additives reduced the premix fraction of the heat release on the 1992 DDC engine at all loads and reduced the premix fraction at low

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Section: Comparison Of Heat Release Between Enginesmentioning

confidence: 99%

“…It is plausible that since the 2004 Cummins engine implements higher injection pressures, mixing was enhanced, and shorter ignition delays were created [91]. Studies with high boost pressures create reduced ignition delays, and the heat release profile approaches the injection profile [92,93].…”

Section: Comparison Of Heat Release Between Enginesmentioning

confidence: 99%

The Effects of Fuel Additives on Diesel Engine Emissions during Steady State and Transient Operation

Nuszkowski¹

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“…11 Effects of start of combustion on peak cylinder pressure, P max , the degree of constant volume, (dP/du) max , and brake thermal efficiency at full load To achieve high BSFC, a high degree of constant volume combustion was sought by advancing the combustion phasing while maintaining P max below 28 MPa by means of delaying IVC timing. Figures 13,14,and 15 show the effects of the start of combustion on the indicated and brake thermal efficiencies, BSFC, pumping and friction losses, degree of constant volume, P max , and (dP/du) max with the IVC timing as a parameter. Retarding IVC timing causes reduced effective compression ratio and lower P max , which allow operation at advanced start-of-combustion timings with a higher degree of constant volume combustion.…”

Section: Effect Of Effective Compression Ratio On Bsfcmentioning

confidence: 99%

Improvement of thermal efficiency of a high-boosted diesel engine with focus on peak cylinder pressure

Aoyagi¹,

Yamaguchi²,

Osada³

et al. 2011

International Journal of Engine Research

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The combination of high boosting and high exhaust gas recirculation (EGR) is a practical and effective strategy to achieve simultaneous reductions of fuel consumption and exhaust emissions in diesel engines. To obtain further improvements of fuel efficiency and emissions, the effects of engine parameters including compression ratio, peak cylinder pressure, and the timing of the start of combustion are investigated using a single-cylinder diesel engine under conditions of high boost pressure of 400 kPa and fuel injection pressure of 200 MPa, focusing particularly on the peak cylinder pressure. The experiments show that when the peak cylinder pressure is raised to 28 MPa by adjusting the timing of the start of combustion at 23°after top dead centre (ATDC) at a compression ratio of 18, the lowest specific fuel consumption rate of 185.6 g/kW h, which corresponds to the brake thermal efficiency of 45.2 per cent, is obtained. When the effective compression ratio is lowered by using a variable valve timing system while maintaining the peak cylinder pressure at 28 MPa, the minimum specific fuel consumption of 181.2 g/kW h, which corresponds to a brake thermal efficiency of 46.3 per cent, is obtained.

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“…RCM is an instrument designed to stimulate a single compression event of an engine cycle of internal combustion engine [6][7][8]. The influence of the injection process inside the combustion chamber has to be considered in the analysis of spray formation and propagation.…”

Section: Introductionmentioning

confidence: 99%

Study on Spray Characteristics of Biodiesel using a Rapid Compression Machine

Jaat

Khalid

Manshoor

et al. 2015

AMM

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Mixture formation plays as a key element on burning process and controlled by the characteristics if the injection system, the nature of the swirl and turbulence in the cylinder, ad spray characteristics. Mixture formation during ignition process associated with the exhaust emissions.Measurements were made in an optically-accessible rapid compression machine (RCM) with intended to simulate the actual diesel combustion related phenomena. The diesel spray was simulated with the RCM which is equipped with the single-shot common-rail fuel injection system. Diesel engine compression process could be reproduced within the wide range of ambient temperature, ambient density, swirl velocity, equivalence ratio and fuel injection pressure. The examination of the first stage of mixture formation is very important consideration due to the fuelair premixing process linked with the combustion characteristics. The detail behavior of mixture formation images was captured using the high speed camera.This method can capture spray penetration length, spray angle, spray evaporation and mixture formation process clearly. The spray characteristic such as the penetration length, spray angle and spray area are increasing when the injection pressure increased.

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Diesel Combustion and Emission Study by Using of High Boost and High Injection Pressure in a Single Cylinder Engine (Third Report)~Effects of Boost Pressure on Friction Losses

Cited by 10 publications

References 0 publications

The Effects of Fuel Additives on Diesel Engine Emissions during Steady State and Transient Operation

The Effects of Fuel Additives on Diesel Engine Emissions during Steady State and Transient Operation

Improvement of thermal efficiency of a high-boosted diesel engine with focus on peak cylinder pressure

Study on Spray Characteristics of Biodiesel using a Rapid Compression Machine

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