Combustion Characteristics of a 3000 Bar Diesel Fuel System on a Single Cylinder Research Engine

Palanisamy, Madhushankar; Lorch, Jeffrey M.; Truemner, Russell; Baldwin, Brian

doi:10.4271/2015-01-2798

Cited by 14 publications

(7 citation statements)

References 7 publications

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“…The maximum injection pressure of the modern common rail system has beyond 250 MPa and some prototype systems with even higher P inj are under investigations. 2–4…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on effect of gas/spray interactions on transient diesel spray behaviors

Wang

et al. 2023

International Journal of Engine Research

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The ever-increasing rail pressure in diesel engines may cause the injection induced shock waves. In the present study, different gases (N2 and CO2) were used as the ambient mediums in order to understand the effect of shock waves induced by the high-speed jets on the near-field spray penetration. The tests were carried out in an optically-accessible constant volume vessel and a single-hole diesel injector was used. The injection pressure ( Pinj) ranged from 80 to 150 MPa and the ambient density ( ρambient) are 11.25, 22.52, and 33.81 kg/m3, respectively. Schlieren imaging was used to capture the shock waves ahead of the sprays with a frame speed of 100,000 fps and high-speed imaging was used to capture the spray penetration evolution with a frame speed of 300,000 fps in order to provide sufficient high temporal and spatial resolutions of the spray development. Shock waves can be observed under CO2 atmosphere over all the tested conditions and almost invisible under N2 atmosphere. The timings of occurrence and detachment of the shock waves are advanced with the increase in ρambient, but less sensitivity to Pinj. The difference in penetration lengths for N2 and CO2 atmosphere are not consistent as Pinj and ρambient varied, indicating the complicated role of shock waves in influencing the spray behaviors. Several mechanisms for the generation of shock waves were discussed, as well the physical meaning of the timing to the peak velocity of the spray tip with breakup time.

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“…The maximum injection pressure of the modern common rail system has beyond 250 MPa and some prototype systems with even higher P inj are under investigations. 2–4…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on effect of gas/spray interactions on transient diesel spray behaviors

Wang

et al. 2023

International Journal of Engine Research

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“…The typical fuel injection pressure upper limit for production diesel systems has risen from about 1500 bar ten years ago to about 1000 bar more than that presently [12], with a range of 300 to 2400 bar [13]. Current research is tending towards greater than 3000 bar capable diesel fuel injection systems [12 -15].…”

Section: Introductionmentioning

confidence: 99%

Nozzle configuration and in-cylinder pressure effects on fuel spray behaviour: studies using a rapid cycling machine

Njere

Emekwuru

2021

J Braz. Soc. Mech. Sci. Eng.

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“…Light duty systems capable of achieving up to 3000 bar have been announced and are under development. [1,2] An increase in pressure will result in a corresponding increase in fuel temperature after compression with studies showing changes in fuel temperatures of up to 150 °C in 1000-2500 bar injection systems. [3][4][5][6][7] Until recently, the addition of Fatty Acid Methyl Esters, FAME, to diesel had been blamed for a number of fuel system durability issues such as injector deposits and fuel filter blocking.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Impact of FAME and Diesel Fuel Composition on Stability and Vehicle Filter Blocking

Gopalan¹,

Chuck²,

Roy-Smith³

et al. 2019

SAE Int. J. Adv. & Curr. Prac. in Mobility

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In recent years, there has been an impetus in the automotive industry to develop newer diesel injection systems with a view to reducing fuel consumption and emissions. This development has led to hardware capable of higher pressures, typically up to 2500 bar. An increase in pressure will result in a corresponding increase in fuel temperature after compression with studies showing changes in fuel temperatures of up to 150 °C in 1000-2500 bar injection systems.Until recently, the addition of Fatty Acid Methyl Esters, FAME, to diesel had been blamed for a number of fuel system durability issues such as injector deposits and fuel filter blocking. Despite a growing acceptance within the automotive and petrochemical industries that FAME is not solely to blame for diesel instability, there is a lack of published literature in the area, with many studies still focusing on FAME oxidation to explain deposit formation and hardware durability.The majority of studies into diesel degradation are conducted under non-representative laboratory conditions, or are extrapolated from the deposits found in filters from vehicles with failed injectors. In this study, the cause of this degradation was investigated by using a novel High Pressure Common Rail (HPCR) non-firing rig designed to mimic a diesel common rail system, simulating realistic, albeit accelerated, operating conditions. The degree of deposition on the system fuel filter was monitored, for both petroleum diesel (B0), RF79 (B0), Bx (where x is percentage volume/volume of FAME) and surrogate diesel fuel components.A systematic study of synthetic surrogates demonstrated that, as well as FAME, any base fuel component, under sufficiently high pressures and temperatures experienced in the HPCR are prone to degradation irrespective of the concentration of the component in the original fuel. The most unstable component acts as the instigator, thus promoting fuel oxidation. The other components in the fuel such as FAME, aromatic and cycloalkane portions will also oxidise and eventually polymerise to form solids blocking the filter. This also demonstrates that while a large body of work on the oxidative instability of biodiesel in the chemical laboratory is indicative of instability this does not mimic what is seen under more realistic vehicle conditions and the focus on FAME instability is misleading.

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Combustion Characteristics of a 3000 Bar Diesel Fuel System on a Single Cylinder Research Engine

Cited by 14 publications

References 7 publications

Experimental investigation on effect of gas/spray interactions on transient diesel spray behaviors

Experimental investigation on effect of gas/spray interactions on transient diesel spray behaviors

Nozzle configuration and in-cylinder pressure effects on fuel spray behaviour: studies using a rapid cycling machine

Assessing the Impact of FAME and Diesel Fuel Composition on Stability and Vehicle Filter Blocking

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