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风荷载是地面雷达天线罩的主要荷载之一,风荷载会影响雷达罩的强度和稳定性,并会间接影响到雷达天线的使用精度,导致雷达天线的指向偏差和偏焦。所以雷达天线罩的风载研究是雷达天线罩设计的重要环节之一。该文用Solid Works建立雷达天线罩的微缩模型,借助ANSYS ICEM CFD进行结构化网格划分,然后导入到FLUENT中进行风载的流场计算。在FLUENT流场计算中,选用了标准K-ξ模型、RNG K-ξ模型和Reliable K-ξ模型,对三种模型下的罩体迎风面、侧面以及背风面风压分布规律进行了对比,最终选用更加适合该文的RNG K-ξ模型。并对风速为V=20 m/s、V=28 m/s和V=36 m/s下的雷达天线罩的数值模拟和风洞试验的风压结果对比。结果表明:在罩体迎风面的风压曲线拟合的较好,而在罩体侧面及背风面的风压曲线出现了一定的偏离;风速越大,风压显著增大。通过对风载下地面雷达天线罩在数值模拟方法和风洞试验下风压分布的比较,可见数值模拟方法在雷达天线罩的设计中扮演重要角色,仿真得到的数据也可为实际工程领域的风洞试验提供数据支持。
Wind load is one of the main loads of the ground radome. The wind load will affect the strength and stability of the radome, and will indirectly affect the accuracy of the radar antenna, leading to the deviation of the radar antenna and deflection. Therefore, the radome study of wind radome is one of the most important aspects of radar radome design. In this paper, the miniature model of radar radome is set up with Solid Works. The structured grid is solved by ANSYS ICEM CFD and then imported into FLUENT to calculate the flow field of wind load. In the calculation of FLUENT flow field, the standard K-ξ model, RNG K-ξ model and Reliable K-ξ model were selected to compare the wind pressure distribution on the windward side, the leeward side and the leeward side under the three models. Finally, the RNG K-ξ model which is more suitable for the paper is selected. The numerical simulation of radar radome at wind speed V = 20 m / s, V = 28 m / s and V = 36 m / s is compared with that of wind tunnel test. The results show that the wind pressure curve on the windward side of the cover body fits well, while the wind pressure curve on the side and the leeward side of the cover body appears a certain deviation; the wind speed increases significantly and the wind pressure increases significantly. By comparing the wind pressure distribution of the radome under the wind load with the numerical simulation method and the wind tunnel test, we can see that the numerical simulation method plays an important role in the design of the radar radome. The simulated data can also be used in practical engineering fields Hole test to provide data support.