Effects of particle size and pressure on combustion of nano-aluminum particles and liquid water
Effects of particle size and pressure on combustion of nano-aluminum particles and liquid water
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DOI：
10.1016/j.combustflame.2013.04.025
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发表时间：
2013-10
影响因子：
4.4
通讯作者：
D. Sundaram;V. Yang;Ying Huang;G. Risha;R. Yetter
中科院分区：
文献类型：
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作者：
D. Sundaram;V. Yang;Ying Huang;G. Risha;R. Yetter
对纳米铝-水混合物在1-10 MPa压力范围内的燃烧波传播进行了理论和实验研究。通过求解各区域的守恒方程，并在界面处实现质量和能量的连续性，建立了一个多区域框架来预测燃烧特性和火焰结构。通过在恒定体积的容器中燃烧纳米铝-水束来测量火焰特性。本文研究的是向下传播的火焰。重点放在颗粒大小和压力的影响。推导出燃烧速率的解析表达式，并确定了决定火焰行为的物理化学参数。对于研究中存在的条件，燃烧速率显示出r B [cm/s]= 98.8×（p [MPa]）0.32（dp [nm]）-1.0形式的压力和粒度依赖性。火焰厚度随着颗粒尺寸的增大和压力的降低而增大。结果支持的假设，即铝-水混合物的燃烧控制的质量扩散穿过颗粒的氧化物层。
The combustion wave propagation of nanoaluminum–water mixtures is studied theoretically and experimentally for particles in the size range of 38–130 nm and over a pressure range of 1–10 MPa. A multi-zone framework is established to predict the burning properties and flame structure by solving the conservation equations in each zone and enforcing the mass and energy continuities at the interfacial boundaries. The flame properties are measured by burning nanoaluminum–water strands in a constant-volume vessel. The present study deals with the downward propagating flame. Emphasis is placed on the effects of particle size and pressure. An analytical expression for the burning rate is derived, and physicochemical parameters that dictate the flame behavior are identified. For conditions present in the study, the burning rate shows pressure and particle size dependencies of the form r b [cm/s]= 98.8×(p [MPa]) 0.32 (d p [nm])-1.0. The flame thickness increases with increasing particle size and decreasing pressure. Results support the hypothesis that the combustion of aluminum–water mixtures is controlled by mass diffusion across the oxide layers of the particles.