Visualization and Image Analysis of Outflow of Combustion Products of Pyrotechnic Composition from the Model Gasgenerator

Using the visualization, experimental studies of outflow of combustion products of solid pyrotechnic composition from a two-nozzle unit of the model gasgenerator are conducted. The methods are described: for calibrating the exposure degree (gray level) of the Videosprint matrix camcorder according to the brightness temperature of the tungsten filament of the standard lamp SI8-200; for pseudo-color coding of images; for configuring the color wedge taking into account the introduced calibration curve. The examples of pseudo-color processing of a frame of the outflowing stream of combustion products in the fire test and the temperature field with the highest values in the range 2400-2500 K are given. It is found that the use of high-speed digital video camera with a frequency of shooting of 500 frames/s resulted in registration of vortex structures on a border of the stream of combustion products, unlike video shooting by the Panasonic camera (a frequency of 25 frames/s), when a border of the submerged stream appears smooth.

References

[1] M.M. Mazur, V.N. Shorin, V.N. Zhogun, V.I. Pustovoyt, V.E. Pozhar, Yu.K. Kalinnikov, N.S. Kostin, L.I. Mazur, V.N. Toropov, D.V. Shorin. Akustoopticheskiy ramanovskiy spektrometr. V kn.: "Akustoopticheskie, akusticheskie i rentgenospektral’nye metody i sredstva izmereniy v nauke i tekhnike" [Acousto-optical Raman spectrometer. In book: "Acousto-optical, acoustic and X-ray methods and means of measurement in science and technology"], Moscow, VNIIFTRI Publ., 2005, pp. 16-26.

[2] Bobrov A.N., Yagodnikov D.A., Popov I.V. Ignition and combustion in two-component powder suspension in a gas. Combustion, explosion and shock waves, 1992, vol. 28, no. 2, pp. 155-158.

[3] Yagodnikov D.A., Voronetskiy A.V., Lapitskiy V.I. Flame propagation for aero-suspension of aluminum at low pressures Fizika goreniya i vzryva [Combustion, explosion and shock waves], 1995, vol. 31, no. 5, pp. 23-31 (in Russ.).

[4] Yagodnikov D.A., Voronetskii A.V. The Effect of Electric Field on Ignition and Combustion Processes of Combustible Cases, Dust and Liquids. Combustion, Explosion, Shock Waves, 1994, vol. 2, pp. 87-90.

[5] Teplinskiy M.V., Yagodnikov D.A. Digital processing and analysis of visualization results of fire tests of a model solid-fuel rocket engine. Vestn. Mosk. Gos. Tekh. Univ. im. N. E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2005, no. 3, pp. 34-41 (in Russ.).

[6] Mal’tsev V.M., Mal’tsev M.I., Kashporov L.Ya. Osnovnye kharakteristiki goreniya [Basic characteristics of combustion]. Moscow, Khimiya Publ., 1977. 320 p.

[7] Kadyshevich A.E. Measuring the temperature of the flame. Moscow, Metallurgy Publ., 1961. 218 p.

[8] Yagodnikov D.A. Vosplamenenie i gorenie poroshkoobraznykh metallov [Ignition and combustion of powdered metals]. Moscow, MGTU im. N.E. Baumana Publ., 2009. 432 p.