We study the dynamics and properties of a turbulent flame, formed in the presence of subsonic, high-speed, homogeneous, isotropic Kolmogorov-type turbulence in an unconfined system. Direct numerical simulations are performed with Athena-RFX, a massively parallel, fully compressible, high-order, dimensionally unsplit, reactive-flow code. A simplified reaction-diffusion model represents a stoichi...

A flame shape descriptor based on coordinates of edge of a flame is proposed. Artificial Neural Network is used to predict flame image edges .A flame with constant x-coordinate is used in the present study. Y-coordinates of flame edge are predicted using neural network. Recognition experiments were carried out using flame image sampled from a burning candle. The results show a good recognition ...

Normal-gravity experiments were conducted with inverse diffusion flames of small density difference with their surrounding ambient to study low Grashof number (Gr) flames that were several centimeters in diameter. The intensity of buoyancy was minimized by ejecting diluted air from a porous, spherical burner into a lower-density fuel atmosphere of hydrogen or hydrogen and methane at reduced pre...

0010-2180/$ see front matter 2011 The Combust doi:10.1016/j.combustflame.2011.08.015 ⇑ Corresponding author. Fax: +1 607 255 1222. E-mail address: [email protected] (C.T. Avedisian). The droplet burning characteristics of binary blends of iso-octane, n-heptane and toluene were studied in an ambience that minimizes external convection and promotes spherical droplet flames. The results are compare...

In the period from 2019 to 2022, joint American–Russian space experiment (SE) Flame Design (Adamant) was carried out on International Space Station (ISS). The purpose of SE study mechanisms control soot formation in a spherical diffusion flame (SDF) formed around porous sphere (PS), and radiative extinction SDF under microgravity conditions. objects this were “normal” “inverse” SDFs gaseous eth...

In order to reduce CO2 emissions, hydrogen combustion has become increasingly relevant for technical applications. this context, lean H2-air flames show promising features but, among other characteristics, they tend exhibit thermo-diffusive instabilities. The formation of cellular structures associated with these instabilities leads an increased flame surface area which further promotes the pro...

To reveal the inner mechanism of gas explosion dynamic behavior affected by gas equivalent concentration, a high speed Schlieren image system and flow field measurement technology was applied to record the gas explosion flame propagation and flame structure transition. The results show that a flame front structure transition occurs, followed by a flame accelerating propagation process. The lami...

The Olympic flame and torch are significant symbols of the Olympic Games and are important in linking the general public with the festival. They are internationally recognized symbols, particularly important at the Opening and Closing Ceremonies. “It is through the opening and closing ceremonies and the torch relay that the Olympiad must distinguish itself from another series of world champions...

предложен оптический метод изучения структуры короткоживущих, нестационарных и неустойчивых образований низкотемпературной плазмы, использующий ее рефракционные свойства. На основе имеющихся наблюдательных данных об оптических свойствах шаровой молнии решения интегрального уравнения Абеля получены возможные радиальные распределения показателя преломления, концентрации заряженных частиц температ...

Abstract Combusting metal precursor-laden droplets, required in spray-flame synthesis of nanomaterials, are known to undergo a rapid and disruptive disintegration, i.e., puffing micro-explosion. In this work, imaging with high spatiotemporal resolution image-analysis routines were developed investigate droplet disruption oxides. Droplet shadowgraphs imaged on high-speed camera. The solvent was ...