Now the hypothesis of existence of scalar fields of a various nature and energy density in the modern Universe is intensively explored. It can explain a nature of the dark (nonbaryon) matter in the Universe and an existence of positive Λ-term [1]. One of component of such field has a cluster nature and organizes in the closed gravitational configurations from galactic scales up to relativistic ...

Ozone addition presents a promising approach for optimizing and regulating both combustion ignition mechanisms. In Rotating Detonation Engines (RDEs), investigating the impact of ozone is particularly important due to fact their unique operating conditions potential improved efficiency. This study explores influence concentration, total temperature, equivalent ratio on characteristics hydrogen–...

Two-dimensional numerical simulations with Eulerian-Lagrangian method are conducted to study propagation and extinction of stoichiometric hydrogen/air detonations in fine water sprays. Parameterized by mass loading initial droplet size, a detonation map is developed. Detonation would occur larger and/or smaller size. General features gas phase droplets local frontal structures well captured. Nu...

Using 15 LES cycles of a high load / low speed spark ignition engine operating point, two different fresh gases autoignition regimes called knock and super-knock are analyzed. A direct “a posteriori” analysis of pressure waves and autoignition heat release observed in LES is proposed. It reveals that low to moderate knock intensity, corresponding to late spark timings (ST) is characterized by o...

Characteristics of continuous rotating detonation (CRD) in a cavity-based annular combustor are studied through three-dimensional simulations, which solved OpenFOAM with skeletal chemical kinetics mechanism. The results show that the wave (CRDW) attaches to outer wall and detaches from inner combustor. A high-temperature recirculation zone is found cavity reactive intermediate species identifie...

Research carried out from 2003-2005 at the Explosion Dynamics Laboratories at Caltech under an ONR contract has examined many issues critical to Pulse Detonation Engine (PDE) development. These include: detonation structure imaging using OH PLIF; a narrow channel facility for examining regular and irregular detonations; detonation diffraction; mechanism of soot track generation; fundamental and...

This paper presents an overview of experimental and numerical investigations of the nonequilibrium cold plasma generated under high overvoltage and further usage of this plasma for plasma-assisted combustion. Here, two different types of the discharge are considered: a streamer under high pressure and the so-called fast ionization wave (FIW) at low pressure. The comprehensive experimental inves...

This study investigates combustion clouds embedded in unconfined spherical explosions. Two charge configurations are considered: a 0.5-g spherical PETN booster surrounded by a spherical shell of either 1-g of TNT solid or of 1-g of Aluminum (Al) powder; these provide the fuel for the combustion process. Detonation of booster disperses the fuel, whose expansion drives a blast wave into the surro...

A well-known effect of amines, and also of water, on detonation characteristics of nitromethane (Nm) is discussed from the point of view of the published knowledge about the study of initiation reactivity of this nitro paraffin. It is documented that bimolecular and higher interactions during the initiation of Nm are impossible. The most widespread concepts of the primary steps of this initiati...

In this work the effect of the accuracy of a FAE detonation modeling on the generated blast wave is investigated. First, a one-dimensional numerical simulation with a reduced chemical kinetics of C2H2-O2-Ar, involving 25 elementary reactions, is used as the base model. The properties of the blast calculated with this model is compared with those of simpler models, the similarity solution of Tay...