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Article
Thermodynamics
Ashwini Karmarkar et al.
Summary: The study focuses on the impact of coherent oscillations on the growth of a flame brush and how this is influenced by the turbulence intensity of the approaching flow. Results show that under low-turbulence conditions, high-amplitude acoustic excitation can cause the flame brush to exhibit step-function growth. This impact is strongly dependent on the turbulence intensity, and higher levels of turbulence minimize the impact of increasing amplitudes of acoustic excitation.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Mechanics
A. I. Krikunova et al.
Summary: An experimental investigation was conducted on an inverted conical, plane-symmetrical premixed methane-air flame stabilized by a bluff body under acoustic excitation and various gravity conditions. The phase-resolved particle image velocimetry method was used to determine the recirculation zone characteristics. The size of the longitudinal vortex zone increases with increasing fuel concentration and flow velocity under normal and reverse gravity conditions. The size of the vortex zone becomes sensitive to the excitation frequency with an increase in flow velocity.
Article
Engineering, Aerospace
A. I. Krikunova et al.
Summary: Ensuring fire safety is crucial in the development of habitable spacecraft. This study investigates the dynamics of an M-shaped premixed methane-air flame under normal and reversed gravity with various external acoustic excitations. The results show that low frequency acoustic excitation has minimal impact on the flame front, while at 160 Hz, oscillatory motion becomes more energetically saturated. As the frequency increases further, the dominant energy shifts back to the main gas flow, reducing its effect on the flame structure.
Review
Engineering, Aerospace
Augustin Guibaud et al.
Summary: Fire safety is a prime concern in inhabited space exploration. This article examines past incidents, analyses fire safety planning development, and evaluates the current fire provisions in the International Space Station. With future deep space exploration, there is a need to rethink existing solutions and conduct further research.
Editorial Material
Engineering, Aerospace
N. N. Smirnov
Summary: The article discusses the use of special materials to withstand external effects in the aggressive space environment. It also reviews the Space flight safety measures and discusses topics such as protection of Space structures, fire safety of Space vehicles, safety at launch and during landing, as well as propulsion systems modeling and supercomputer predictive modeling.
Article
Engineering, Aerospace
Yuanzhe Liu et al.
Summary: This paper numerically investigates mode competition and cooperation phenomena in liquid rocket engines experiencing combustion instabilities. The study reveals the relationship between acoustic mode and intrinsic vorticity mode and analyzes the detailed coupling process between intrinsic vortex shedding and acoustic oscillation. The findings provide important insights into combustion instability.
Article
Mechanics
A. Krikunova et al.
Summary: This paper shows that acoustics can increase the stability of flames under certain conditions of reverse gravity, and that there is a hysteresis in the V-M and M-V transitions under both reverse and normal gravity. The study also proves that the conditions for hysteresis degeneracy under reverse gravity are independent of the excitation frequency.
Article
Engineering, Aerospace
Ryoya Umeoka et al.
Summary: The study investigated the high-frequency combustion instability of liquid-propellant rocket engines through combustion tests. It was found that a rapid and large pressure increase near the propellant injector occurred, with a short duration. The pressure in the semi-enclosed space during combustion was significantly higher than before combustion.
Article
Mechanics
A. Krikunova et al.
Summary: This study experimentally investigates the stability of an inverted conical plane-symmetrical premixed methane-air flame under normal and reversed gravity conditions. The flame can exhibit both V-shaped and M-shaped configurations depending on various factors. Gravity plays a significant role in the stability of the flames, with the most unstable flames observed under reversed gravity conditions.
Article
Mechanics
A. Krikunova et al.
Summary: Experimental investigation of an inverted conical plane-symmetrical premixed methane-air flame under acoustic excitation explored transitions between different flame front configurations and the effects of acoustic disturbances. New data was obtained, revealing characteristics of hysteresis effects and their influencing factors.
Article
Mechanics
A. Krikunova
Review
Thermodynamics
T. Poinsot
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2017)
Article
Multidisciplinary Sciences
E. R. Stofan et al.
