ТЕМПЕРАТУРНІ РЕЖИМИ ЗОН ЗВОРОТНИХ ТОКІВ У БЛИЖНЬОМУ СЛІДІ ЦИЛІНДРИЧНИХ СТАБІЛІЗАТОРІВ ПОЛУМ'Я

Autor: A. V. Klisch, A. B. Timoshchenko, E. I. Milko, N. N. Olkhovskaya, A. A. Ozerov, L. A. Shvetsova, Yu.V. Sherenkovskii, M. Z. Abdulin, A. A. Seryi, Nataliia Fialko
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Науковий вісник НЛТУ України, Vol 28, Iss 3, Pp 97-100 (2018)
ISSN: 2519-2477
1994-7836
Popis: The results of experimental studies of the temperature regimes of the back flow zones behind the cylindrical flame stabilizers of microjet burners are presented. The authors have considered a burner device, which is a circular channel with a cylindrical stabilizer placed in it. Circular openings for feeding fuel gas (propane-butane) into the blowing air flow off are located in a circle on the stabilizer. To determine the sizes of the back flow zones in the regions astern of the stabilizer, a method of visualizing the flow using sodium salts was used. The temperature measurement in the back flow zone was carried out by the chromel-alumel thermocouple. The regularities of the influence on the length of the back flows zones and the temperatures in these zones of such regime parameters of the combustion process as the value of the air flow velocity at the inlet to the channel and the air excess coefficient are analysed. Particular attention is paid to the study of the features of the change in the heat state and the length of the back flow zones as a function of the magnitude of the relative pitch of disposition of the gas-supply openings. An increase in the relative pitch of the gas-supplying openings and the air excess coefficient is shown to lead to a decrease in the length of the back flow zones, and an increase in the airflow velocity, on the contrary, increases this length. The influence of the relative pitch of disposition of the gas is noted to supply openings related to the fact that its growth leads to an increase in the injecting action of the fuel gas jets, which consists in a greater attraction of ambient air to the fuel jets. This in turn leads to an additional increase in the degree of rarefaction in the back flows zone beyond the stabilizer, and then to a decrease in the length of this zone. The dependence of the length of the back flow zone on the magnitude of the relative pitch of the gas supply openings is observed to be significant only at relatively high values of the air excess coefficient. With an increase in this pitch and the air-flow velocity, the maximum values of the temperatures are defined to increase. An increase in the air excess coefficient is considered to lead to a drop in maximum temperatures in the back flows zone. The results of the completed studies can be used in energy practice in the design of burner devices for fuel combustion equipment with relatively low power, when it is necessary to ensure the uniformity of heat supply over the fire space.
Databáze: OpenAIRE
Externí odkaz: