液态碳氢燃料热辐射物性参数反演方法

基于光线跟踪法建立了玻璃-液态碳氢燃料-玻璃3层平板总透射比的正问题模型,给出了反演液态碳氢燃料热辐射物性参数(光谱吸收指数 k 和光谱折射指数 n)的反问题模型,采用Monte-Carlo(M-C)法结合区间逼近法求解.通过将已知文献中庚烷的热辐射物性参数作为“真实值”,采用正问题模型计算总透射比作为“实验测量值”,然后利用反问题模型计算 n 和 k ,并分析实验偏差对反演计算的影响.研究结果表明:①模型反演 k 计算误差的标准差小于0.003%,而 n 的标准差高于21%.②实验偏差对反演计算影响较大,且偏差达到1.0%时个别反演数据明显“失真”.③ k 反演计算误 差的标准差 y 与实验偏差 γ 满足 y =2285.2 γ2- 10.484 γ +0.0037的关系式; n 反演计算误差的标准差受实验偏差影响较小,但偏差导致反演 n 误差均超过20%. 

Inverse method investigation of thermal radiation property of liquid hydrocarbon fuel

The spectral transmittance radio calculation model of glass-liquid hydrocarbon fuel-glass three layer slabs was developed based on ray trace method,and an inverse model was built to determine the thermal radiation property(k is extinction coefficient and n is refractive index) of liquid hydrocarbon fuel in the three layer slabs.The inverse model was retrieved,and was combined with Monte-Carlo method and area approach method.The thermal radiation property of heptane attained in the references was selected as the true values,and the spectral transmittance radio of the three layer slabs based on the direct model simulation was regarded as the experimental values.The thermal radiation property of Heptane was achieved by the inverse model,and then the effect of measurement error on the inverse results was also investigated.The results show that,(1) the standard deviation of k calculation error by the inverse model is less than 0.003%,and that of n is higher than 21%.(2) the effect of measurement error on the inverse results is urgent distinct,and some inversed calculation values are obviously when the measurement error is higher than 1%.(3) the standard deviation of k calculation error and measurement error y satisfy the equation which is y=2285.2 γ2-10.484γ+0.0037.The effect of measurement error on the standard deviation of n calculation error is lower,however,the n calculation error is higher than 20% when the measurement error exists.