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High fuel economy is typically achieved with smooth velocity profiles, which can be attained with slow engine response. The reverse however, is not true. Specifically, this paper shows that slow engine response may have deleterious fuel economy effects when aggressive profiles such as the US06 drive cycle need to be tracked. This effect is crucial for strategies which enable higher fuel efficiency...
Conventional and alternative jet fuels, such as petroleum-derived Jet-A, coal-derived IPK, and natural-gas-derived S-8, display significant chemical and physical fuel property differences that influence their ignition characteristics. The current work addresses the need for surrogate mixtures capable of emulating the various properties of these fuels and their select blends, which are often used within...
The current study presents an experimental validation of jet aviation fuel surrogates formulated using a surrogate model-optimizer. Two surrogate fuel mixtures are used to emulate a practical Jet-A (POSF 4658) considering a series of physical and chemical processes in diesel engines. The surrogate mixtures consist of: n-dodecane/isocetane/methylcyclohexane (MCH)/toluene 0.3844/0.1484/0.2336/0.2336...
CFD simulations of reacting fuel sprays were conducted to identify temperature-dependent physical properties of the liquid fuel that should be emulated by diesel and jet fuel surrogates during compression ignited combustion. Using a validated CFD model for an n-dodecane spray under diesel-relevant conditions, six physical properties of the liquid phase fuel (density, vapor pressure, viscosity, surface...
Two surrogates are developed using a model-based optimizer to emulate the fuel properties affecting the spray development and gas phase ignition of a conventional jet fuel. The first surrogate, UM1, is a mixture of n-dodecane/iso-cetane/methylcyclohexane/toluene (0.3844/0.1484/0.2336/0.2336mol fraction), while the second, UM2, is a mixture of n-dodecane/iso-cetane/decalin/toluene (0.2897/0.1424/0...
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