Efficiency and heat loss analysis of honeycomb receiver varying air mass flow rate and beam width
Efficiency and heat loss analysis of honeycomb receiver varying air mass flow rate and beam width
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DOI：
10.1016/j.ijheatmasstransfer.2019.03.153
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发表时间：
2019-07
影响因子：
5.2
通讯作者：
Mitsuho Nakakura;K. Matsubara;Selvan Bellan;T. Kodama
中科院分区：
文献类型：
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作者：
Mitsuho Nakakura;K. Matsubara;Selvan Bellan;T. Kodama
本研究分析了三种类型的简易型和缩减型接收器的效率和热损失。对蜂窝接收器接收到通过方形单元的集中辐射加热气流的情况进行了共轭模拟。采用DO(离散纵坐标)方法计算辐射强度，并将流动与三种换热方式完全耦合。本文证实了DO模型的网格数目和角度离散化对简单通道内的温度分布没有显著影响。通过比较实验和仿真的接收效率，验证了模型的有效性。在验证后，研究了简单的和两种独特的几何通道(缩进1和2)，改变空气质量流量和波束宽度。对于三种不同类型的接收机，波束宽度对接收效率的影响不大。然而，接收器的效率在很大程度上取决于空气质量流量。空气质量流量有一定的取值，使接收器的效率最大化。将空气质量流量降低到这一标准以下会导致效率明显下降。分析表明，在一定的空气质量流量下，再辐射损失最小，三种情况下的效率最高。
This study analyzed efficiency and heat loss of three types of simple and cut-back receivers. The conjugate simulation was made for situation where the honeycomb receiver receives concentrated radiation heating air stream through square cells. The DO (Discrete Ordinate) approach was adopted to calculate the radiation intensity and to fully couple the flow and three styles of heat transfer. This paper confirmed no significant effects for temperature distribution of the simple channel due to number of grids and angular discretization of DO model. The model is validated by comparing the receiver efficiency between experiments and simulations. After the validation, the simple and two unique geometric (cut-back 1 and 2) channels are investigated changing the air mass flow rate and beam width. There are no great effects from the beam width on the receiver efficiency for three types of different receivers. Whereas, the receiver efficiency was vastly dependent on the air mass flow rate. There are certain value of air mass flow rate maximizing the receiver efficiency. Reducing the air mass flow rate below this criterion resulted in clearly deteriorating the efficiency. The analysis indicated that the re-radiation loss was minimized at a certain level of air mass flow rate maximizing the efficiency for three cases of receivers.