Specific features of n-decane vapors self-ignition in air at temperatures of 600–800 K

В В Лещевич ,О Г Пенязьков ,С Ю Шимченко

doi:10.29235/1561-8323-2020-64-6-747-756

Abstract

Experiments of n-decane/air self-ignition at the temperature range 600–800 K were carried out by rapid compression machine. It allowed obtaining temperature-concentration limits of transition from single-stage to two-stage ignition. High-speed video recording has let established that hot stage ignition always initiates near the piston surface or quartz window. These locations depend on gas temperature. Combustion of the test mixture occurs in the entire volume after that. Couple sequential photos of cool flame shows that it starts same near piston surface and has a complicated volumetric structure caused by the roll-up gas vortex. It is shown that partial n-decane pressure increasing during compression causes the non-equilibrium condensation process near the inner surfaces of combustion chamber. This leads to significant redistribution of n-decane concentration and determines local characteristics self-ignition of n-decane/air mixture.

Highlights

Experiments of n-decane/air self-ignition at the temperature range 600–800 K were carried out by rapid compression machine
High-speed video recording has let established that hot stage ignition always initiates near the piston surface or quartz window
Couple sequential photos of cool flame shows that it starts same near piston surface and has a complicated volumetric structure caused by the roll-up gas vortex

Summary

Introduction

Experiments of n-decane/air self-ignition at the temperature range 600–800 K were carried out by rapid compression machine. В [11] на УБС квадратного сечения получены результаты по измерению задержки воспламенения паров н-декана в воздухе в диапазоне температуры от 600 до 700 К и давлении 0,7 и 1,5 МПа. 3. Динамика давления (черная линия) и свечения на длине волны 431,5 нм (синяя линия), зарегистрированные в экспериментах со стехиометрической смесью при температурах 720 (а), 713 (b) и 670 К (c) вместе с фотографиями очагов горения, где красная штриховая линия – граница между поверхностью поршня и боковой стенкой камеры сгорания

Results

Conclusion