摇摆运动条件下自然循环流动的实验和理论研究

针对摇摆运动对自然循环流动的影响，开展了实验和理论研究．实验分摇摆实验和不摇摆实验2部分，实验结果表明：摇摆造成了自然循环流量周期性波动，波动周期与摇摆周期一致，波动振幅随摇摆频率和摇摆振幅的增加而增加，同时摇摆造成了自然循环平均流量的降低．通过构建数学模型，对摇摆运动条件下的自然循环流动进行了理论计算，计算结果和实验结果符合良好．同时，分析了摇摆对自然循环影响的机理，结果表明，流动阻力系数的增加是造成自然循环平均流量降低的主要因素．

Experimental and theoretical study on natural circulation flow under rolling motion condition

The effect of rolling motion on the natural circulation flow was studied experimentally and theoretically.The experiment was divided two parts.One analyzed rolling and the other non-rolling motion.The experimental results show that the rolling motion yields periodically fluctuating fluid flow,and the period of fluctuation is the same as the rolling period.The amplitude of fluctuation increased with increasing roll amplitude and frequency,but the volume circulating decreased due to the rolling motion.A mathematic model was developed to calculate the natural circulation flow under rolling motion.The calculated results are in reasonable agreement with the experimental data.The results show that an increase in the coefficient of resistance to flow is the main factor affecting the decrease in natural circulation volume flow in the presence of rolling motion.