Radiation heat transfer in ablating boundary layer combustion theory used for hybrid rocket motor analysis
Radiation heat transfer in ablating boundary layer combustion theory used for hybrid rocket motor analysis
复制标题
用于混合火箭发动机分析的烧蚀边界层燃烧理论中的辐射传热
DOI：
10.1016/j.combustflame.2020.04.011
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发表时间：
2020
影响因子：
4.4
通讯作者：
DesJardin, Paul E.
中科院分区：
文献类型：
--
作者：
Budzinski, Kenneth;Aphale, Siddhant S.;Ismael, Elektra Katz;Surina, Gabriel;DesJardin, Paul E.
Marxman理论常被用于混合火箭发动机分析中燃料退化率的关联式。在该理论中，辐射的影响被解释为对非辐射吹送极限的扰动，允许来自辐射热传递的吹送阻塞的领先阶效应影响对流热通量。然而，该理论不考虑辐射气体吸收特性的非线性变化，以允许紧密耦合的热传递和表面吹扫的描述。在这项研究中，马克思主义理论扩展在一个新的完全耦合的方法，采用Schvab-Zeldovich耦合函数，不稳定的传热响应的燃料，气相辐射传热的解决方案。为了发展这一理论，马克思的理论进行了推广，以允许扩展的功能形式的摩擦系数和帐户的变化，气体性质。为了验证建模方法，从一个简化的板坯燃烧器实验进行测量。石蜡被用作燃料和相对较低的氧化剂通量，因此可以理解的辐射传热的主导作用。温度、烟尘体积分数和燃料辐射热通量的测量依赖于使用高速摄像机彩色图像的双色高温计分析。模型预测数据的比较表明，新的紧密耦合的方法提供了良好的预测的回归率，温度和辐射热通量的燃料表面的氧化剂流量的范围内考虑。模型敏感性研究表明，常用的单向耦合策略可能会导致显着的过度预测的燃料回归率，最有可能补偿的辐射传热的简化处理的错误。
Marxman theory is often used for developing correlations of fuel regression rate for hybrid rocket motor analysis. Effects of radiation are accounted for in this theory as a perturbation to the non-radiating blowing limit allowing for the leading order effects of blowing blockage from radiation heat transfer to influence convective heat flux. The theory does not, however, account for the non-linear changes in radiative gas absorption properties to allow for tightly coupled descriptions of heat transfer and surface blowing. In this study, Marxman theory is expanded in a new fully coupled approach, employing Schvab-Zeldovich coupling functions, unsteady heat transfer response of the fuel, and solution of the gas-phase radiation heat transfer. To develop this theory, Marxman’s theory is generalized to allow for expanded functional forms of friction coefficient and account for changes in gas properties. To validate the modeling approach, measurements from a simplified slab burner experiment are conducted. Paraffin wax is used as the fuel and relatively low oxidizer fluxes are employed so the dominate effects of radiation heat transfer can be understood. Measurements of temperature, soot volume fraction, and fuel radiative heat flux rely on two-color pyrometry analyses using high-speed camera color images. Comparisons of model predictions to data indicate the new tightly coupled approach provides good predictions of regression rate, temperature, and radiative heat flux to the fuel surface over the range of oxidizer flow rates considered. Model sensitivity studies reveal commonly used one-way coupling strategies may result in significant over prediction in fuel regression rate that are most likely compensated for by errors in simplified treatments of radiation heat transfer.