Influence of the electric field on the burning rate of alkanes

• Дата: 2019
• Автори: Orlovskaya, S.G., Karimova, F.F., Shkoropado, M.S., Chernyak, V.Ya.
• Формат: Стаття
• Мова: English
• Опубліковано: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2019
• Назва видання: Вопросы атомной науки и техники
• Теми: Low temperature plasma and plasma technologies
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/194714
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Influence of the electric field on the burning rate of alkanes / S.G. Orlovskaya, F.F. Karimova, M.S. Shkoropado, V.Ya. Chernyak // Problems of atomic science and technology. — 2019. — № 1. — С. 180-183. — Бібліогр.: 6 назв. — англ.

The effect of a homogeneous electric field on the burning of alkane particles in air is investigated. Stages of heat and mass exchange processes in the combustion process are determined. It is shown that the melting of a particle is the main constituent part of the induction period, the time during which the particle ignites. It is found that the melting rate is substantially reduced if the electric field strength exceeds a certain critical value. In our experimental conditions, it is about 60 kV/m. The effect of the electric field on melting is more pronounced at elevated temperatures and at high values of the Stefan number. The kinetics of the combustion of droplets of octadecane of various initial diameters was studied. It is proved that in a definite region of combustion the linear law of the square of the droplet diameter with time is fulfilled. The effect of an electric field on the burning rate of particles of different initial diameters is investigated. It is established that under the influence of the electric field, the burning rate of the droplets of alkanes increases. In particular, for droplets of octadecane, the burning rate in a constant electric field increases by 10…20 %, depending on the initial diameter of the drop. Constant burning droplets of octadecane are found. The effect of an electric field on the geometric dimensions of a flame is studied. It is established that under the influence of the field the flame becomes asymmetric and shifts towards the negatively charged plate. This reduces the height of the flame and increases its width. These phenomena are associated with the action of the "ion wind" in the flame and the transformation of the energy of the electric field into thermal energy, as a result of which the combustion front approaches the surface of the drop, increasing the rate of its evaporation. Calculations of the melting time of octadecane particles were carried out and a comparison was made with the data of experimental studies. The good agreement between experimental and calculated results is proved.