Extinction of incident hydrogen/air detonation in fine water sprays
نویسندگان
چکیده
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. Numerical soot foils used characterize the influence size on wave. The results also show that cell increases increased or decreased Analysis unsteady process performed evolutions structure, spatial distribution thermochemical variables interphase transfer rates (mass, energy, momentum). Moreover, chemical explosive mode analysis reveals for stable detonation, thermal runaway dominates behind Mach stem, while propensities auto-ignition appear alternately incident When induction zone length as reaction front (RF) shock (SF) decoupled, localized burned pockets surrounded autoignition can be observed. In addition, interactions between wave demonstrate energy momentum have more direct interaction SF RF than transfer. increase loading. Under same loading, rates. However, has limited exchange.
منابع مشابه
Detonation and Transition to Detonation in Partially Water-Filled Pipes
Detonations and deflagration-to-detonation transition (DDT) are experimentally studied in horizontal pipes which are partially filled with water. The gas layer above the water is stoichiometric hydrogen–oxygen at 1 bar. The detonation wave produces oblique shock waves in the water, which focus at the bottom of the pipe due to the curvature of the walls. This results in peak pressures at the bot...
متن کاملEXTINCTION CONDITIONS OF NON-PREMIXED FLAMES WITH FINE DROPLETS OF WATER AND WATER/NaOH SOLUTIONS
Interactions of fine droplets of water and water/NaOH solutions with a steady, laminar counterflow methane/air nonpremixed flame are investigated experimentally and numerically. A water atomizer generating a polydisperse distribution of droplet sizes with a median diameter of 20 lm is used in experiments with steady feed rate. Comparisons of the measured flame extinction condition as a function...
متن کاملDroplet Dynamics Changes in Electrostatic Sprays of Methanol-Water Mixtures
Two-dimensional phase Doppler anemometry measurements have been carried out to determine the size and velocity distributions of electrosprayed droplets generated from methanol-water mixtures. We investigated spraying conditions close to those of electrospray ionization sources. The droplet size and the axial and radial velocity distributions were measured as a function of liquid flow rate, need...
متن کاملEvaporative Cooling of Continuously Drawn Glass Fibers by Water Sprays
This paper examines the effect of the water sprays commonly used to cool freshly drawn glass fibers. A model has been developed using a Karman-Pohlhausen treatment of the velocity and thermal boundary layers and accounting for the evaporation of an entrained water spray. Solutions of the model equations have been calculated, and the effect of changing various process parameters is studied. Vari...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2021
ISSN: ['1527-2435', '1089-7666', '1070-6631']
DOI: https://doi.org/10.1063/5.0071405