The Influence of Combustion Chamber Geometry on the Modes of Continuous Detonation of a Mixture of Kerosene and Heated Air
F. A. Bykovskii, S. A. Zhdan, A. N. Samsonov, E. F. Vedernikov
Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: fire heating of air, hydrogen, liquid kerosene, continuous spin detonation, continuous multi-front detonation
Abstract
In a flow-through annular combustion chamber with a diameter of 503 mm, with a narrowed outlet section and profiling of the channel (installation of cavities at the beginning or end of the chamber), the modes of continuous multi-front detonation of kerosene with air heated to 800 K were implemented and investigated. It was shown that the installation of cavities increased the frequency of transverse waves. In the coordinates of the specific air consumption --- excess fuel coefficient, the region of implementation of detonation modes was determined. It was found that the existence of the continuous multi-front detonation mode is due to collisions of transverse shock waves generating transverse detonation waves, which degenerate into shock waves before collisions. When installing a cavern at the end of the annular cylindrical chamber, the maximum specific impulse relative to the fuel of 2,040 s was obtained. The minimum length of the combustion chamber in which the continuous multi-front detonation mode is implemented is in the range of 530 ÷ 670 mm. Measurements of pressure profile pulsation levels in the pre-chamber and at the combustion chamber outlet by high-frequency sensors have determined that they belong to the category of sound vibrations. This is important for the use of detonation combustion in practical applications.
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