Performance of divergent-chimney solar power plants
Performance of divergent-chimney solar power plants
复制标题
发散式烟囱太阳能发电厂的性能
DOI：
10.1016/j.solener.2018.05.068
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发表时间：
2018-08
期刊：
影响因子：
6.7
通讯作者：
Zhou Xinping
中科院分区：
文献类型：
--
作者：
Xu Yangyang;Zhou Xinping
本文对发散式烟囱太阳能发电厂（DSPPs）进行了模拟，并通过在较大范围内改变烟囱出口与进口面积比（COAR，表示发散度）来研究DSPP的性能。研究方法包括使用由浮力和静压恢复组成的总压势（TPP），其中使用有效压力势恢复系数（EPPRC）。结果表明：当COAR足够大时，会发生边界层分离、流动失速和回流，形成涡流，并阻塞部分流区；由于周围冷空气的回流，温度在BLS点以上大幅下降，可能导致发散烟囱浮力降低。随着COAR的增大，TPP先增大，在COAR = 8.7时达到最大值，然后减小。质量流量和输出功率具有相同的变化趋势，集热器温升具有相反的变化趋势。COAR = 8.7时的最大功率为231.7 kW，是COAR = 1时的11.9倍。在流动失速发生前，由于边界层缓慢增厚，EPPRC下降缓慢，大于0.91。而在发生失速后，主要是由于涡旋和回流的影响，EPPRC大幅降低，并随着COAR逐渐降低。有效地热流密度增加了功率输出，但对烟囱内流动失速特性的影响很小，特别是对EPPRC。
Simulations of divergent-chimney solar power plants (DSPPs) are conducted, and the DSPP performance studied by changing chimney outlet-to-inlet area ratios (COAR, representing the degree of divergence) over a wide range of values. Study method involves the use of total pressure potential (TPP) which consists of buoyancy and static pressure recovery in which an effective pressure potential recovery coefficient (EPPRC) is employed. Results show when the COAR is large enough, the boundary layer separation (BLS), flow stall and backflow will occur, vortex be formed, and a part of flow area be blocked. Due to the backflow from the ambient cool air, the temperature greatly decreases above the BLS point, possibly causing the reduction of buoyancy of the divergent chimney. With COAR increasing, the TPP initially increases and reaches a maximum for COAR = 8.7 then decreases. The mass flow rate and the power output have the same variational trend, while the collector temperature rise has the inverse variational trend. A maximum power of 231.7 kW is attained at COAR = 8.7, which is 11.9 times as high as that for COAR = 1. Before the occurrence of flow stall, the EPPRC decreases slowly due to the gently thickening of boundary layer and is higher than 0.91. While after the occurrence of flow stall, mainly due to the vortex and backflow the EPPRC greatly decreases and is found to decrease gradually with COAR. The effective ground heat flux increases the power output, but has little influence on the characteristics of the flow stall in the chimney, specifically the EPPRC.
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影响因子：
6.7
作者：
Xinping Zhou;Yangyang Xu
通讯作者：
Xinping Zhou;Yangyang Xu
DOI：
10.1115/1.2210491
发表时间：
2006-08
影响因子：
2.3
作者：
J. Pretorius;D. Kröger
通讯作者：
J. Pretorius;D. Kröger
DOI：
--
发表时间：
1984
期刊：
--
影响因子：
--
作者：
R. Blevins
通讯作者：
R. Blevins
影响因子：
15.9
作者：
Zhou Xinping;Yangyang Xu;S. Yuan;Cai Wu;Zhang Hao
通讯作者：
Zhou Xinping;Yangyang Xu;S. Yuan;Cai Wu;Zhang Hao
影响因子：
10.4
作者：
Sandeep K. Patel;D. Prasad;M. Rafiuddin Ahmed
通讯作者：
Sandeep K. Patel;D. Prasad;M. Rafiuddin Ahmed