Numerical investigation of the pulse jet flow of an inhomogeneous gas-dispersed mixture


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The paper presents the results of numerical simulation of the pulse jet flow of a gas-dispersed mixture as a prototype of the jet powder technology of fire extinguishing or pollution neutralization. Two cases of pulsed two-phase jets have been studied: with alternating sections of powder and gas layers inside the discharge cylindrical channel, as well as with its homogeneous initial filling. The time dependences of the gas-dynamic parameters in the outlet section of the ejection channel and spatial numerical Schlieren images of particle concentrations are obtained. The determining mechanism of the jet inhomogeneous flow is hydrodynamic instability with the formation of large-scale vortex structures, which leads to the intensification of mixing processes.

numerical modeling, jet powder technology

DOI: http://doi.org/10.33257/PhChGD.23.4.996


Volume 23, issue 4, 2022 year


Численное исследование импульсного струйного течения неоднородной газодисперсной смеси

В работе представлены результаты численного моделирования импульсного струйного течения газодисперсной смеси, как прототипа струйной порошковой технологии пожаротушения или нейтрализации загрязнений. Изучены два случая импульсных двухфазных струй: с чередованием секций порошка и газовых слоев внутри выбросного цилиндрического канала, а также с его однородным начальным заполнением. Получены зависимости от времени газодинамических параметров в выходном сечении выбросного ка-нала и пространственные численные шлирен-изображения концентраций частиц. Определяющим механизмом струйного неоднородного потока является гидродинамическая неустойчивость с образованием крупномасштабных вихревых структур, что приводит к интенсификации процессов перемешивания.

численное моделирование, струйная порошковая технология

DOI: http://doi.org/10.33257/PhChGD.23.4.996


Volume 23, issue 4, 2022 year



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