The Influence of Hydrogen Proportion on the Propagation Characteristics of Hydrogen-kerosene-air Rotating Detonation Waves

doi:10.3969/j.issn.1000-1093.2022.01.010

Abstract

Abstract: The influence of hydrogen proportion on the propagation characteristics of rotating detonation waves is studied. Two-dimensional numerical simulation of rotating detonation process was made by solving the Navier-Stokes equation，in which liquid kerosene and hydrogen were used as fuel，and air was used as oxidant. The influence of different working conditions on the propagation characteristics of rotating detonation wave is studied by changing the mass flow rate and the proportion of hydrogen，and the formation process of new detonation wave，the mode conversion process and the mal-distribution of gas and liquid in the combustion chamber are analyzed. Numerical results show that the detonation wave has three propagation modes，namely single wave mode，single wave mode caused by double wave collision and double wave mode caused by double wave collision，under the successful detonation condition. The double wave mode is easily generated by increasing mass flow rate and hydrogen proportion，and the propagation velocity of rotating detonation wave suddenly decreases when propagation mode changes from single wave to double wave. At the end of the first propagation period of detonation wave， the weak shock wave generated during the initial ignition collides with the detonation wave and transmits it. A hot spot is induced by the transmitted shock wave near the slow-burning area and forms a new detonation wave. After a series of collisions，transmitting，and enhancing processes，a stable single wave mode or double wave mode is finally formed. When the detonation wave stabilizes，the internal flow field during the stable propagation of rotating detonation wave in the combustion chamber can be divided into slow-burning area，combustion-rich area，oxygen-rich area and filling area due to the mal-distribution of gas and liquid in the combustion chamber.The formation of hot spots near the slow-burning area is one of the reasons for the formation of new detonation wave.

Key words: hydrogen-kerosenemixedfuel, rotatingdetonationwave, gas-liquidtwo-phasedetonation, propagationcharacteristics, mal-distributionofgasandliquid

CLC Number:

V434⁺.13

WU Mingliang， ZHENG Quan， XU Han， WENG Chunsheng， BAI Qiaodong. The Influence of Hydrogen Proportion on the Propagation Characteristics of Hydrogen-kerosene-air Rotating Detonation Waves[J]. Acta Armamentarii, 2022, 43(1): 86-97.

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