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通过建立曲折系数为的连续弯道进行试验,并利用Reynolds应力模型进行模拟计算,从水面线、流速场、弯道环流及强度等方面研究了小曲折系数连续弯道水力特性。结果表明,Reynolds应力模型能够较好的模拟连续弯道水流。实测资料和计算结果均显示在部分弯道区域出现水流分离现象。在同一断面,近凸岸的纵向流速垂线分布接近对数流速分布,靠近凹岸的纵向流速垂线分布呈现随相对水深先增大后减小的规律,呈现“凸肚”形。在弯道环流方面,呈现非对称的双环流结构;水面和槽底处的环流强度大于水体中部,凹岸的环流强度大于凸岸的环流强度。
Experiments were carried out by establishing a continuous curve with tortuosity coefficient, and the Reynolds stress model was used to simulate the calculation. The hydraulic characteristics of continuous curves with small tortuosity coefficients were studied from the aspects of water surface, velocity field, curve circulation and strength. The results show that the Reynolds stress model can simulate continuous curve flow well. The measured data and the calculated results show that the phenomenon of water flow separation occurs in some curved areas. At the same section, the vertical distribution of vertical flow near the convex bank is close to the logarithmic distribution of velocity, and the vertical distribution of vertical flow velocity near the concave bank presents the “convex belly” shape as the water depth first increases and then decreases. In the aspect of curve circulation, the asymmetric double circulation structure is present. The circulation current at the water surface and the bottom of the groove is larger than that in the middle part of the water body, and the circulation strength of the concave bank is larger than that of the convex shore.