Injection timing effects on partially premixed diesel–methane dual fuel low temperature combustion

Abstract

Dual fuel low temperature combustion (LTC) strategies are attractive for future internal combustion engines due to their promise of very low engine-out emissions of oxides of nitrogen (NO x) and particulate matter. In the present work, experimental results for diesel-ignited methane dual fuel LTC on a compression ignition single cylinder research engine (SCRE) are presented. Methane was fumigated into the intake manifold and diesel injection was used to initiate combustion. The engine was operated at a constant speed of 1500 rev/min, and diesel injection pressure was fixed at 500 bar. The start of injection (SOI) of diesel fuel was varied from 260º to 360º (i.e., TDC) to quantify its impact on engine performance and engine-out, indicated-specific emissions of NO x (ISNO x), carbon monoxide (ISCO), and unburned hydrocarbons (ISHC), and smoke emissions. The SOI sweeps were performed at different net indicated mean effective pressures (IMEPs) of 4.1 and 12.1 bar. Intake manifold pressure and methane percent energy substitution (PES) were fixed at 1.5 bar and 80%, respectively, for 4.1 bar IMEP and at 1.8 bar and 95%, respectively, for 12.1 bar IMEP. For all loads, when SOI was advanced, the longer ignition delays caused the separation between the fuel injection and the combustion events to increase. This was accompanied by a change in the shape of the AHRR curve from a distinct two-stage profile to a smooth, single-stage (almost Gaussian) profile.

The effect of injection parameters and boost pressure on diesel-propane dual fuel low temperature combustion in a single-cylinder research engine

“…Dual fuel LTC has been demonstrated with diesel as the high-cetane fuel and a variety of primary, low-cetane fuels such as methane or natural gas [34][35], gasoline [10,33,36], ethanol [37], etc. Among gaseous primary fuels for dual fuel LTC, methane (or natural gas) has been investigated quite extensively.…”

“…The present effort is an attempt to fill this gap. Building on previous research efforts on dual fuel LTC at Mississippi State University (MSU) [34][35][36][44][45], this paper presents experimental results for diesel-ignited propane dual fuel LTC on a single-cylinder research engine (SCRE). Considering the wellestablished infrastructure for propane production and distribution within the United States, it is attractive as the primary fuel for dual fuel LTC.…”

Assessment of late pilot injection effect in dual-fuel combustion

“…Guerry et al in (2016) [7] varied SOI on a wide range of values, testing a single-cylinder compression ignition engine, observing that, when SOI was advanced, the ignition delay (ID) and the separation between the end of injection and start of combustion both increased. The heat release rate (HRR) curve changed from a distinct two-stage profile to a smooth singlestage profile.…”

Trade-off Improvements by Combining EGR and Supercharging Ignited by Next Generation Bio-alcohol Blended FAME Fuels in Diesel Dual Fuel Operation Using Natural Gas

“…Drawbacks include large amounts of unburned HC and CO emissions, specifically at low loads, which is a major factor to decrease thermal efficiency at partial loads. To improve partial load performance many studies with various approaches have been conducted (Mizushima et al, 2003;Ogawa et al, 2003;Aroonsrisopon et al, 2009;Wannatong et al, 2009;Abdelaal and Hegab, 2012;Taniguchi et al, 2012;Li et al, 2015;Yang et al, 2015;Guerry et al, 2016;Blasio et al, 2017).…”