薄壁蓄热器周期传热仿真系统的开发

基于渐近分析法开发蜂窝蓄热器传热数字仿真软件。建立薄壁蓄热器周期传热的数学模型,求取针对沿气流流动方向弱固体导热条件下的蓄热器温度分布近似表达式,并设计了求取其解析—数值解的算法。运用Matlab的符号运算、数值积分和卷积功能,开发出薄壁蓄热器周期传热仿真系统。热态实验证实了解析精度和可靠性。用等效气固传热系数,可减少由简化通道内热辐射和忽略入口效应引起的解析误差。有效地提高了低氧弥散燃烧设计和操控优化的经济性、准确性和效率。

Development on Simulation System of Periodical Heat Transfer for Thin-walled Regenerator

The digital simulation software of heat transfer in honeycomb regenerator was developed with the asymptotic analytic method. The mathematical model of periodical heat transfer in thin-walled regenerator was set up, and the approximate expressions of temperature profiles in case of weak solid conduction along the gas flow direction were obtained, and the new algorithm for the analytical and numerical solution was designed. Based on the symbolic manipulation, the numerical integral and the convolution integral function in Matlab, the heat-transfer simulation system of thin-walled regenerator was developed. The analytic precision and the reliability were proved with the hot tests. The analytic error resulting from simplifying thermal radiation inside the channel and neglecting the entrance effect could be decreased through a larger equivalent heat-transfer coefficient between gas and solid phase. The economics, accuracy and efficiency of optimal design, operation and control for dispersion combustion with low oxygen concentration are improved effectively.