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 $\div$ 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.
