On the Interpretation and Correlation of High‐Temperature Ignition Delays in Reactors with Varying Thermodynamic Conditions

Abstract

Ignition delay time (IDT) is a useful global metric for fuel performance screening and a major target for kinetic modeling. Measurements of IDT are conceptually straightforward; however, interpretation could be complicated, especially for systems with changing temperature and pressure. Some experimental conditions in the high repetition rate miniature shock tube (HRRST) exhibit complex temperature and pressure state histories. To better interpret and correlate IDTs, especially those obtained in reactors with varying thermodynamic conditions, an inverse Livengood-Wu (L-W) integral technique is applied to deconvolve the constant condition IDTs from measured IDTs in the HRRST using information on the varying state history. In this paper, the approximate problem is demonstrated using only the measured pressure history

Prospects and Limitations of Predicting Fuel Ignition Properties from Low-Temperature Speciation Data

“…An ideal fuel-screening platform should both be general (i.e., applicable to any proposed fuel candidate or blend) and require as little fuel as possible. Many tools for fuel screening have been described in the literature, for example, those that measure ignition directly in chambers of various designs. − While this approach is general, it typically requires numerous measurements in a broad range of pressures and temperatures, with 10s of milliliters of fuel used at each P and T point. Furthermore, direct measurements of specific ignition properties are often not easily extrapolated to different properties or different operating conditions.…”