Experimental study on laminar flame speeds and chemical kinetic model of 2,4,4-trimethyl-1-pentene

Abstract

The laminar flame speeds for 2,4,4-trimethyl-1-pentene/air mixtures have been measured in a constant volume combustion bomb, at initial temperatures of 400 and 450 K, initial pressures of 0.1 and 0.3 MPa, and equivalence ratios from 0.6 to 1.5. Both the linear and nonlinear models are used for extrapolation of unstretched flame speed. It is observed that there is a small discrepancy in laminar flame speed using linear and nonlinear models at ϕ⩽1.1, while this discrepancy becomes larger at higher equivalence ratio. Moreover, a chemical kinetic model for 2,4,4-trimethyl-1-pentene including 50 species and 361 elementary reactions is developed. Full validations show that the present model can well predict both ignition delay times and laminar flame speeds, at a wider range of initial temperatures, initial pressures and equivalence ratios. Using the present model, the rate of production analysis is performed to investigate the main reaction pathways of 2,4,4-trimethyl-1-pentene combustion. The analysis indicates that the differences of reaction pathways at high and low temperatures, are mainly embodied in the three aspects of primary reactions of 2,4,4-trimethyl-1-pentene, reactions of TC4H9, and reactions of isobutenyl.