水轮发电机定子蒸发冷却系统中两相流压降实验研究

Experiment on Two-Phase Flowing Pressure Drop in the Evaporative Cooling System of Hydro-Generators

本项研究旨在为水轮发电机定子自循环蒸发冷却系统中的两相流压降提供一个简便可靠的计算方法.首先假设了两相段压力降与全液相单相流动阻力之间放大倍数的数学模型,继而在蒸发冷却循环系统的实验模型平台上对两种管径的矩形空心导线进行了加热实验,最后通过实验的测量结果确定了数学模型中的各项系数,从而得到了放大倍数计算的实验关联式.该关联式的计算结果与实验结果的相对误差小于 1000, 说明放大倍数数学模型的建立是正确的,完全可以用于工程实践中定子蒸发冷却系统的循环计算.

This experiment aims to provide a simple and reliable calculational method for the two-phase flowing pressure drop in the stator′s auto-cycle evaporative cooling system of hydro-generators. Firstly, the amplification ratio of the two-phase flowing pressure drop to the liquid flowing resistance,a mathematical model, is assumed.Secondly, two rectangular hollow conductors with different sections are tested on the experimental platform of the evaporative cooling system. Finally, coefficients in the mathematical model are determined by experimental results and the experimental correlation of amplification is developed. The relative error between calculation results of the experimental correlation and experimental results is less than 10~0_0. It shows that the establishment of the mathematical model is correct to a good extent and the correlation can be used in the engineering calculation of the stator′s evaporative cooling system.