一个高度角循环周期中异型腔式吸热器热损失规律数值模拟

温度影响吸热器保温内气体空气物性参数，基于HOTTEL辐射模型和三维数值模拟方法，研究了某地区一个高度角循环周期中自然对流情况下38 k碟式太阳能斯特林热机异型吸热器的热损失变化规律，得到了异型吸热器的温度场云图、对流和辐射热损失的平均努塞尔数以及热损失各项所占比例.结果表明：在一个高度角循环周期中，在不同的时间点，各项热损失所占的比例不一样，对流热损失先减小后增大，辐射热损失和导热热损失较小，且对流热损失的变化比较明显，其余的变化较小；高度角对Nuc的影响较大，Nuc随着高度角变大，先减小后增大；高度角对Nuc的影响较小，其变化只在一个很小的范围内波动；在任何情况下热损失中，对流热损失大于辐射热损失，辐射热损失大于导热损失.

Numerical simulation of the special shaped cavity receiver heat loss laws in a elevation angle cycle

Based on the influence of temperature on the physical properties of the gas (air) in the thermal insulation layer of the receiver, the HOTTEL model and the three dimensional numerical simulation method ,the change of heat loss of the heat receiver under natural convection in a region with a high angular cycle was studied, The relationship between The relationship between the absorber internal temperature field, Nuc, Nur in the absorber and the proportion of the heat loss were obtained.the result shows that:In a highly angular cycle, convective heat loss decreases first and then increases, the change of the radiation heat loss and heat conduction loss are small and the elevation angle has a great influence on Nuc, when the elevation angle becomes larger, the Nuc decrease first then increase,but,the effect of elevation angle on Nu is small and which changes only in a very small range of fluctuations; In three kinds of heat loss,convective heat loss is the largest proportion ,the second is the radiation heat loss and the heat loss is the least.