Frontier Materials & TechnologiesFrontier Materials & TechnologiesFrontier Materials & Technologies2782-40392782-6074Togliatti State University11110.18323/2073-5073-2019-1-64-71ArticlesСтатьиTHE STUDY OF SPECIAL ASPECTS OF COMBUSTION IN A VARIABLE VOLUME COMBUSTION CHAMBERИССЛЕДОВАНИЕ ОСОБЕННОСТЕЙ СГОРАНИЯ В КАМЕРЕ СГОРАНИЯ ПЕРЕМЕННОГО ОБЪЕМАShaikinA. P.ШайкинА. П.
Russian Federation
IvashinP. V.ИвашинП. В.
Russian Federation
GalievI. R.ГалиевИ. Р.
Russian Federation
BobrovskyI. N.БобровскийИ. Н.
Russian Federation
DeryachevA. D.ДерячевА. Д.
Russian Federation
TverdokhlebovA. Ya.ТвердохлебовА. Я.
Russian Federation
Togliatti State UniversityТольяттинский государственный университет29032019164711103202111032021https://vektornaukitech.ru/jour/article/view/111

The paper covers the study of special aspects of the application of ionization sensors intended for determining the characteristics of flame propagation (flame propagation velocity and the width of chemical combustion reactions area) in the variable volume combustion chamber. The review of contemporary methods of study of the process of hydrocarbon fuel combustion in piston engines showed the perspectivity of ionization sensors application. On a single-cylinder engine, the authors experimentally obtained and studied the main parameters of fuel combustion using the specially developed ionization sensors designed for identifying the characteristics of flame propagation when changing temperature, pressure, turbulence, and the combustion chamber volume in a wide range within several milliseconds. The variance of ion current, flame propagation turbulent velocity and the width of combustion chemical reactions area are determined depending on the fuel-air mixture composition when changing its physical and chemical properties due to the addition of hydrogen. It is shown that the change in the flame propagation turbulent velocity when adding hydrogen is caused by the increase in its normal component, and the width of turbulent combustion area is linearly related to the ion current value and its variance reflects the intensity of chemical combustion reactions. It is identified that despite the change in the excess air factor, the hydrogen concentration in fuel, and the engine speed rate, the linear dependence of flame width on the flame propagation turbulent velocity in the second combustion phase remains: the velocity increase corresponds to the flame width narrowing.

Статья посвящена изучению особенностей применения ионизационных датчиков для исследования характеристик распространения пламени (скорости распространения и ширины зоны химических реакций пламени) в камере сгорания переменного объема. Обзор современных методов исследования процесса сгорания углеводородного топлива в поршневых двигателях показал перспективность применения ионизационных датчиков. На одноцилиндровом двигателе экспериментально получены и исследованы основные параметры сгорания топлива с помощью специально разработанных ионизационных датчиков, предназначенных для определения характеристик распространения пламени при изменении в широком диапазоне за несколько миллисекунд температуры, давления, турбулентности и объема камеры сгорания. Определены изменения ионного тока, турбулентной скорости распространения пламени и ширины зоны химических реакций горения в зависимости от состава топливно- воздушной смеси при изменении ее физико-химических свойств за счет добавок водорода. Показано, что изменение турбулентной скорости распространения пламени при добавке водорода происходит в основном за счет увеличения ее нормальной составляющей, а ширина зоны турбулентного горения линейно связана с величиной ионного тока, и ее изменение отражает интенсивность протекания химических реакций горения. Обнаружено, что, несмотря на изменение коэффициента избытка воздуха, концентрации водорода в топливе, скоростного режима двигателя, сохраняется линейная зависимость ширины пламени от турбулентной скорости распространения пламени во второй фазе сгорания: увеличение скорости соответствует уменьшению ширины пламени.

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