水利水电科技进展2016，Vol.36Issue(4)：13-19,7.DOI:10.3880/j.issn.1006-7647.2016.04.003
基于桨叶调节的轴流转桨式水轮机模型飞逸数值模拟
Numerical simulation of runaway transients of Kaplan turbine model based on blade regulation
摘要
Abstract
In order to study the effect of different laws regarding the opening and closing of the blade on the runaway transient of a Kaplan turbine, the runaway transient of a Kaplan turbine model in five blade control modes was simulated using the three-dimensional unsteady numerical method. Changes of the rotation speed, flow rate, torques, and pressure fluctuation with time were analyzed, and the pressure distribution on the blade surface and inner flow patterns in the draft tube were examined. The results show that, compared with the maximum runaway speed under the fixed blade conditions, the variation of the maximum runaway speed ranges from -6. 6% to 5. 0% when the blade angle is changed from -10° to 10°. Opening blades during the runaway transient increases characteristic parameter fluctuations, causes the maximum negative pressure at the central area of the draft tube to reach 2. 86 times the initial value, and produces an eccentric spiral vortex rope, which induces strongly low-frequency fluctuation and is adverse to the unit stability. Closing blades can reduce water velocity, alleviate pressure fluctuation, and improve the flow pattern in the draft tube, but reasonable closure modes should be investigated in order to avoid an excessive increase in the runaway speed.关键词
轴流转桨式水轮机/飞逸过程/桨叶调节/启闭规律/三维非定常数值模拟Key words
Kaplan turbine/runaway transient/blade regulation/opening and closure law/three-dimensional unsteady numerical simulation分类
能源科技引用本文复制引用
周大庆,郭优,姜德政..基于桨叶调节的轴流转桨式水轮机模型飞逸数值模拟[J].水利水电科技进展,2016,36(4):13-19,7.基金项目
国家自然科学基金(51339005,51106042) （51339005,51106042）
