Experimental investigation on incipient mass flow rate of micro aluminum powder at high pressure

Experimental investigation on incipient mass flow rate of micro aluminum powder at high pressure
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高压微细铝粉初始质量流量实验研究

DOI:
10.1016/j.expthermflusci.2017.01.012
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发表时间:
2017-05
影响因子:
3.2
通讯作者:
Yang Jiangang
Yang Jiangang
中科院分区:
工程技术2区
文献类型:
--
作者:
Sun Haijun;Hu Chunbo;Zhu Xiaofei;Yang Jiangang

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通过粉末夹带实验,研究了不同变量参数对初始质量流速率的影响。考虑初始总压、颗粒平均粒径、节流孔面积和粉末体积分数等参数,建立了半经验模型。该模型可用于预测粒径在10 ~ 100 μm范围内的初始质量流量。通过比较半经验模型与原模型的相对误差,结果表明半经验模型比原模型具有更高的预测精度。在颗粒夹带过程中,存在三个阶段:含气流出阶段(阶段I)、含大量颗粒流出阶段(阶段II)和含少量颗粒流出阶段(阶段III)。第1阶段的结果表明,颗粒存在拾取延迟,这有利于粉末发动机点火顺序匹配研究。
Experiments on powder entrainment have been carried out to study the influence of different variable parameters on incipient mass flow rate. A semi-empirical model was established by taking into account many affecting parameters, including: initial total pressure, particle mean size, throttling orifice area and powder volume fraction. This model could be used to predict the incipient mass flow rate with particle mean sizes from 10 μm to 100 μm. By comparing the relative error between the semi-empirical model and previous model, the results show that the semi-empirical model has higher prediction accuracy than previous model.In the progress of particle entrainment, there exists three stages: flow-out stage with gas (stage I), flow-out stage with large amounts of particles (stage II), and flow-out stage with small amount of particles (stage III). The result of stage I shows that there exists a pickup delay for particles, which is good for the ignition sequence matching research of powder engine.
DOI: --
发表时间: 2005
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