danДоклады Национальной академии наук БеларусиDoklady of the National Academy of Sciences of Belarus1561-83232524-2431The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8323-2020-64-6-747-756dan-936Research ArticleТЕХНИЧЕСКИЕ НАУКИTECHNICAL SCIENCESОсобенности самовоспламенения паров н-декана в воздухе при температурах 600–800 КSpecific features of n-decane vapors self-ignition in air at temperatures of 600–800 KЛещевичВ. В.LeschevichV. V.

Лещевич Владимир Владимирович – канд. физ.-мат. наук, ст. науч. сотрудник

ул. П. Бровки, 15, 220072, Минск

Leschevich Vladimir V. – Ph. D. (Physics and Mathematics), Senior researcher

15, P. Brovka Str., 220072, Minsk

v.leschevich@dnp.itmo.byПенязьковО. Г.PenyazkovO. G.

Пенязьков Олег Глебович – академик, д-р физ.-мат. наук, директор

ул. П. Бровки, 15, 220072, Минск

Penyazkov Oleg G. – Academician, D. Sc. (Physics and Mathematics), Director

15, P. Brovka Str., 220072, Minsk

penyaz@dnp.itmo.byШимченкоС. Ю.ShimchenkoS. Yu.

Шимченко Сергей Юрьевич – науч. сотрудник

ул. П. Бровки, 15, 220072, Минск

Shimchenko Sergey Yu. – Researcher

15, P. Brovka Str., 220072, Minsk

sergey.shimchenko@gmail.comИнститут тепло- и массообмена имени А. В. Лыкова Национальной академии наук БеларусиA. V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus202031122020646747–756Copyright © Лещевич В.В., Пенязьков О.Г., Шимченко С.Ю., 20202020Лещевич В.В., Пенязьков О.Г., Шимченко С.Ю.Leschevich V.V., Penyazkov O.G., Shimchenko S.Y.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://doklady.belnauka.by/jour/article/view/936

В условиях быстрого адиабатического сжатия изучены особенности самовоспламенения паров н-декана в воздухе при температуре 600–800 К, давлении 0,8–1,2 МПа, эквивалентных отношениях ϕ = 0,5–1,5 и постоянной плотности смеси 5,0 ± 0,5 кг/м3 . Установлены температурно-концентрационные пределы перехода от одностадийного к двухстадийному режиму самовоспламенения. Многоракурсная съемка обнаружила, что в зависимости от температуры «горячая» стадия процесса всегда возникает и развивается вблизи поверхности поршня либо торцевой стенки цилиндра сжатия, сопровождается одновременным переносом образованных очагов внутрь камеры сгорания, после чего происходит близкое к однородному самовоспламенение оставшейся смеси. Фотографии холодного пламени паров н-декана позволили определить пространственное положение очага самовоспламенения первой стадии – вблизи поверхности поршня. Установлено, что вблизи поверхности поршня на оси камеры находится застойная зона, вызванная вихревым тороидальным течением газа, в которой химическая реакция возникает с запозданием. Показано, что по мере увеличения парциального давления паров н-декана при сжатии процесс неравновесной конденсации топлива вблизи стенок камеры сгорания приводит к существенному перераспределению концентрации и температуры смеси по объему, что предопределяет локальные особенности ее последующего самовоспламенения

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.

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The authors declare that there are no conflicts of interest present.