浮体式结构阻力系数试验研究

浮体式结构应用在平原水利防洪工程中时,会导致水流流态及流速分布发生变化,影响过流能力。为得到浮体式结构在运行过程中阻力系数的变化规律及因素影响机理,本文采用物理模型试验,基于水动力学理论分析,对浮体式结构阻水系数的影响因子及其敏感性进行系统研究。利用量纲分析和多元线性拟合,比较得到浮体式结构阻力系数定量计算的最优数学模型,并采用数理统计对该公式进行检验。结果表明：阻力系数与浮体式结构体型、位置、水位条件以及雷诺数有关,且四种影响参数的敏感性明显不同；通过检验得到阻力系数计算模型在可靠性以及精确度方面能够满足工程需要,可为相关工程提供理论依据。

Experimental Study on Resistance Coefficient of Floating Structure

The application of floating structure in plain water conservancy and flood control projects will lead to a change in the flow pattern and velocity distribution, affecting the flow capacity. In order to obtain the variation law of the resistance coefficient of the structure and the influence mechanism of factors during its operation, based on the theoretical analysis of hydrodynamics, the physical model test was used to systematically study the influencing factors and sensitivity of the water resistance coefficient. The dimensionless method and multivariate analysis were used to compare and obtain the optimal mathematical formula for the quantitative calculation of the resistance coefficient of the floating structure, and the statistical analysis method was used to test the formula. The results show that the resistance coefficient is related to the shape, position, water level condition and Reynolds number of the floating structure and the sensitivity of the four influencing parameters are obviously different. Through the verification of the test results, the resistance coefficient calculation model can meet the engineering needs in terms of reliability and accuracy, which can provide a theoretical basis for related projects.