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首页> 外文期刊>International Journal of Thermal Sciences >Scrutiny of spray jet and impact characteristics under dispersion effects of powder injection parameters in APS process
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Scrutiny of spray jet and impact characteristics under dispersion effects of powder injection parameters in APS process

机译：在APS工艺中，粉末喷射参数分散作用下的喷射流和冲击特性的研究

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This study aims to analyse axisymmetric turbulent argon plasma jet charged with particle/droplet stream and its impact characteristics during atmospheric spraying process. The governing partial differential equations are solved using a double population lattice Boltzmann (LB) numerical model (D2Q9-D2Q4) coupled LES turbulence model. The powder dynamics and heating were modeled using a Lagrangian plasma particles interaction model. A validation of the developed LB model on argon plasma jet was done, leading to credible results and the focus was thus mainly made on the plasma particle exchanges during the powder journey in argon plasma. The effects of injection conditions on the spray stream of molten particles and the particles impacting conditions (velocity, temperature, melting rate, ...) are carried out for four selected operating parameters, i.e. particle diameter, injection velocity, injection position (along injector section) and the injection angle at the injector exit. It has been observed that the LB method is a powerful tool for investigating plasma jet flows. It was concluded through the tracking model of the micro-sized particles that the present LB-based results agree well with the FD-based results and that the spray stream depends strongly on the studied injections conditions. Besides, the splashing phenomenon is found to be a rule governing particle/droplet impact behaviors. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：本研究旨在分析充有颗粒/液滴流的轴对称湍流氩等离子体射流及其在大气喷涂过程中的冲击特性。使用双种群晶格玻尔兹曼（LB）数值模型（D2Q9-D2Q4）耦合LES湍流模型求解控制偏微分方程。使用拉格朗日等离子体颗粒相互作用模型对粉末动力学和加热进行建模。对开发的LB模型在氩气等离子流上的有效性进行了验证，从而获得了可靠的结果，因此重点主要放在氩气等离子体中粉末行进过程中的等离子体颗粒交换。对于四个选定的运行参数，即粒径，喷射速度，喷射位置（与喷射器一起），进行喷射条件对熔融颗粒喷射流的影响以及颗粒的撞击条件（速度，温度，熔化速率...）。截面）和喷油器出口处的喷油角度。已经观察到，LB方法是研究等离子流的有力工具。通过对微粒的跟踪模型可以得出结论，当前基于LB的结果与基于FD的结果非常吻合，并且喷雾流在很大程度上取决于研究的注射条件。此外，发现飞溅现象是控制颗粒/液滴冲击行为的规则。 （C）2015 Elsevier Masson SAS。版权所有。

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