Tailoring the Temperature Sensitivity of Ignition Delay Times in Hot Spots Using Fuel Blends of Dimethyl Ether, Methane, and Hydrogen
2019
Vinkeloe, J. | Zander, L. | Szeponik, M. | Djordjevic, N.
Advanced combustion concepts based on autoignition of combustible mixture for internal combustion engine and gas turbine applications are sensitive to reactivity gradients arising from temperature inhomogeneities. A reaction front resulting from such reactivity gradient depends on the physicochemical properties of a combustible mixture and can be influenced by fuel tailoring. The present study investigates the effects of blending fuels with and without negative temperature coefficient (NTC) behavior on the temperature sensitivity of ignition delay times. A first set of experimental data on ignition delay times of a ternary equimolar dimethyl ether/hydrogen/methane fuel blend has been collected in a high-pressure shock tube at a pressure of 33 bar in a range of temperatures between 700 and 1150 K under variation of equivalence ratio. The experimental data are used to evaluate the predictability of available detailed reaction mechanisms regarding ignition delay time and its temperature sensitivity. Both experimental and numerical data have been analyzed in the context of autoignitive wave propagation and detonation development in a generic hot spot. Based on a numerical study, the effect of each fuel component on relevant parameters is investigated.
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