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Effect of non-spherical particles on nozzle two-phase flow loss in nano-iron powder metal fuel motor

机译：非球形颗粒对纳米铁粉金属燃料电机喷嘴两相流失的影响

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摘要

Metal iron powder is a promising new energy source that is of significant practical and research interest for future automotive power systems. However, the shapes of the particles are typically assumed to be spherical or an equivalent sphere when estimating the specific impulse of motors. Such an assumption lacks objectivity and can result in unreasonable estimations of two-phase flow losses. In order to better optimize the design of an engine, this study focuses on the influence of non-spherical particles (such as ellipsoidal and cuboid particles) on the characteristics of nozzle two-phase flow. Models for the governing equations of nozzle two-phase flow are developed to conduct a theoretical study to analyze the combustion properties of iron oxide particles and flow in the nozzle. In addition, experimental studies involving nanometer iron-powder particle combustion and engine thrust measurements are conducted to validate the results obtained from numerical calculations that are conducted using a fourth order Runge-Kutta-Gill method. The results indicate that particle morphology, size, and coagulation content play a significant role in the motor performance and the two-phase flow losses. Specifically, the hypothesis of the ellipsoidal model is in better agreement with the experimental findings compared to the other particle models. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：金属铁粉是一个有希望的新能源，对未来的汽车电力系统具有重要实用和研究兴趣。然而，当估计电动机的特定脉冲时，通常假设颗粒的形状是球形或等效球体。这种假设缺乏客观性，可以导致两相流量损失的不合理估计。为了更好地优化发动机的设计，本研究侧重于非球形颗粒（例如椭圆形和长方体颗粒）对喷嘴两相流的特性的影响。用于喷嘴的控制方程的模型进行两相流动，进行理论研究，以分析铁氧化铁颗粒的燃烧性能并在喷嘴中流动。此外，进行涉及纳米铁粉末颗粒燃烧和发动机推力测量的实验研究以验证从使用第四阶跑速-GILT方法进行的数值计算获得的结果。结果表明，颗粒形态，尺寸和凝血含量在电机性能和两相流损失中起着重要作用。具体地，与其他粒子模型相比，椭圆形模型的假设与实验结果更好。 （c）2019年Elsevier Masson SAS。版权所有。

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