碟式聚光器卸风载数值研究

Numerical simulation of unloading wind loads about a paraboloidal solar dish

文章以太阳能热电系统中的碟式聚光器为研究对象,使用ANSYS CFX 14.0仿真软件,采用SST k-ω湍流模型,该模型比例为1∶1,对蝶式聚光器开缝卸风载的特性进行数值仿真。首次提出了开缝面积比和卸载率两个参数,并计算了不同风速、俯仰角、开缝面积比以及开缝位置情况下,单环缝、等缝宽多环缝以及等面积多环缝的卸风载效果。研究结果表明:当俯仰角为57.5°时,无缝蝶式聚光器所受到的风载最大,而开缝能够有效地降低风载;当开缝面积比为3%,且开缝位置位于碟盘开口半径1/3处时,等面积多环缝的卸风载效果最优。

This paper investigates the numerical simulations of unloading wind loads by opening annular gap for the dish in solar thermal power generation system. The simulation is based on the SST k-ω turbulence model, and the model scale is 1：1 with the use of ANSYS CFX 14.0. The parameters of gap area ratio and unloading ratio are first put forward. The effects of unloading wind loads by opening single annular gap, equal-interval multiple annular gap and equal-area multiple annular gap at different wind velocities, dish pitch angles, gap area ratio and position are calculated. The results indicate that the maximum wind loads appear when the pitch angle is 57.5 ° in seamless dish. Opening annular gap on the dish is an effective method to unload wind loads. When the gap area is 3% of the total dish reflecting surface and the annular gap locates at the inner 1/3 of radial arc length, equal-area multiple annular gap is optimal to unload wind loads.