Auto-ignition Dynamics of Pulsed Turbulent Hydrocarbon Fuel Jets Issuing into High-Temperature Vitiated Coflows

摘要

In the present study, we investigate the auto-ignition dynamics of cold fuel injected in a hot vitiated environment. Due to the short time scale of these events, high-speed measurements are beneficial for resolving the coupled spatio-temporal behavior. The present study uses high-speed (multi-view) OH~* chemiluminescence imaging to identify the location of the initial ignition kernels, providing statistical information on the location of kernel formation qualitative visualization of ignition dynamics. The test platform used for the current study is a transient (pulsed) fuel jet issuing into a high-temperature, vitiated coflow. The fuel under investigation is propane. A fast-actuating solenoid valve provides short pulses of fuel injection and the time-resolved imaging is performed using two intensified high-speed cameras configured orthogonal to each other. The dynamics of the auto-ignition events is studied across a parameter space consisting of constant coflow temperatures with varying stoichiometric mixture fraction and constant stoichiometric mixture fraction with varying coflow temperatures.