Experimental and modeling study of the autoignition of cyclopentane

TL;DR

This study measures ignition delay times of cyclopentene-oxygen-argon mixtures under shock conditions and models the results using a kinetic mechanism, revealing insights into cyclopentene's reactivity compared to similar hydrocarbons.

Contribution

It provides experimental ignition delay data for cyclopentene and validates a kinetic model, enhancing understanding of its combustion behavior.

Findings

Cyclopentene has lower reactivity than cyclohexene but similar to cyclopentane.

A kinetic mechanism accurately models ignition delay times.

Main reaction pathways identified through sensitivity analysis.

Abstract

Ignition delay times of cyclopentene-oxygen-argon mixtures were measured behind reflected shock waves. Mixtures contained 0.5 or 1 % of hydrocarbons for equivalence ratios ranging from 0.5 to 1.5. Reflected shock waves conditions were: temperatures from 1300 to 1700 K and pressures from 7 to 9 atm. When comparing to previous results obtained under similar conditions, it can be observed that the reactivity of cyclopentene is much lower than that of cyclohexene, but very close to that of cyclopentane. A kinetic mechanism recently proposed for the combustion of cyclopentene in a flame has been used to model these results and a satisfactory agreement has been obtained. The main reaction pathways have been derived from flow rate, simulated temporal profiles of products and sensitivity analyses.