| High-Efficiency Sparkplug-Free Engine |
Researchers from Sandia National Laboratories area unit coming up with a replacement sparkplug-free engine to boost the engine potency and automotive fuel economy rates.
The team from Sandia’s Combustion center worked on low-temperature fuel combustion (LTGC) operational strategy within which with chemicals controlled ignition initiates the combustion of dilute charge mixtures.
“The use of dilute mixtures avoids high flame temperatures that may cause pollutant formation,” aforementioned Isaac Ekoto, one amongst the researchers. “LTGC operation will increase engine potency relative to traditional spark-ignited fuel engines through reduced heat transfer and pumping losses, along side inflated conversion of fuel energy into usable work via higher compression ratios and mixture heat ratios.”
The researchers conducted experiments exploitation six totally different single-component fuels: iso-octane, n-heptane, ethanol, cyclohexane, dissolving agent and 1-hexene. every of those fuel pictured totally different categories of elements found in industrial fuel. They conjointly evaluated a analysis-grade fuel whose composition was well understood and a surrogate that mimicked the research fuel.
“Quantifying the concentrations of those species provides valuable insight into however the fuel energy is distributed among the various categories of sunshine hydrocarbons within the reformate,” Ekoto aforementioned.
Further the photoionization mass qualitative analysis (PIMS) and gas chromatograph (GC) measurements were combined to guage the auto-ignition reactivity of the reformates.
The results were evaluated employing a simplified engine-cycle model that verified a rise in charge-specific heat ratios from the low-molecular-weight reformate constituents and also the charge-cooling result from the main-period fuel injection system event. The model conjointly incontestable that a rise within the quantity of reformate for the fuel surrogate sped up compression-induced auto-ignition.
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