Hot surface ignition of ethylene-air mixtures: Selection of reaction models for CFD simulations
2017
会议
Tenth Joint US Sections Meeting of the Combustion Institute
The present study investigated hot surface ignition of C2H4-air mixtures. The ignition thresholds from a stationary commercial glow plug (active heated area is 9.3 mm in height and 5.1 mm in diameter) were characterized using two-color pyrometry and high-speed interferometry. The minimum ignition temperature decreases from 1180 K to 1110 K as the equivalence ratio increases from Φ=0.4 to Φ=4. The performance of eight reaction models have been quantitatively evaluated using a comprehensive database on auto-ignition. The reaction model of Mével C1-C3 and the GRI-mech 3.0 were reduced for inclusion in two-dimensional numerical simulations. Simulations performed with the GRI-mech demonstrate better quantitative agreement for rich mixtures but predicts an opposite trend with Φ as compared to experiments. Simulations with Mével’s model demonstrate quantitative agreement for lean conditions, and decreasing performance for Φ ≤1. However, it reproduces the correct evolution of ignition threshold as a function of Φ.
