Geometric parameters in solar chimney power plants are numerically optimised for the purpose of better power output figures. Several parameters have been investigated in the pilot plant such as chimney height and diameter, collector diameter and slope, and slenderness. However, ground slope has not been studied to date despite its perspicuous impact on turbulent flow. In this study, the impacts of the different slope angles of the ground, where the solar radiation is absorbed through the collector, on the main performance parameters of the system are numerically analysed through a reliable CFD software ANSYS FLUENT. By considering the actual geometric figures of the pilot plant, a 3D model is constructed through DO (discrete ordinates) solar ray tracing algorithm and RNG k-ε turbulence model. For the solar intensity of 1000 W/m², the maximum velocity inside the system is found to be 14.2 m/s, which is in good accordance with the experimental data of 15.0 m/s. Starting from 5 m inside the collector, the chimney inlet heights are reconfigured 0.209, 0.419, 0.625, 0.838, and 1.04 m, respectively, and when the ground slope is 0.1, 0.2, 0.3, 0.4, and 0.5°, the changes in the performance output of the system are investigated. For the reference case which refers to the horizontal ground, the maximum air velocity is determined to be 14.2 m/s and the power output is 54.3 kW. However, when the ground slope is made 0.5°, it is observed that the maximum velocity increases by 37% to 19.51 m/s, and the power output is enhanced to 63.95 kW with a rise of 17.7%. Sloping ground is found a key solution to improve the turbulent effects inside the plant, thus to enhance the electrical power output.

中文翻译：

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地面坡度对太阳能烟囱发电厂主要性能指标的影响：具有实验验证的综合CFD研究

为了获得更好的输出功率，对太阳能烟囱发电厂的几何参数进行了数值优化。在中试工厂中已经研究了几个参数，例如烟囱的高度和直径，收集器的直径和斜率以及细长度。然而，尽管地面坡度对湍流有明显影响，但迄今为止尚未进行研究。在这项研究中，通过可靠的CFD软件ANSYS FLUENT数值分析了地面的不同倾斜角（系统通过收集器吸收了太阳辐射）对系统主要性能参数的影响。通过考虑中试工厂的实际几何图形，通过DO（离散坐标）太阳光线跟踪算法和RNGk- ε构造了3D模型。湍流模型。太阳光强度为1000 W / m ^2时，发现系统内部的最大速度为14.2 m / s，这与15.0 m / s的实验数据非常吻合。从集热器内部5 m开始，烟囱入口高度分别重新配置为0.209、0.419、0.625、0.838和1.04 m，并且当地面坡度为0.1、0.2、0.3、0.4和0.5°时，研究了系统的性能输出。对于参考水平地面的参考情况，最大风速确定为14.2 m / s，功率输出为54.3 kW。然而，当地面坡度设为0.5°时，可以观察到最大速度增加了37％，达到19.51 m / s，功率输出增加到63.95 kW，增加了17.7％。发现倾斜的地面是改善植物内部湍流效果的关键解决方案，