摘要
针对冲击式水轮机在初期设计阶段无合适的综合特性曲线用于电站大波动过渡过程计算的问题,根据冲击式水轮机喷嘴构件的布置特点,推导出喷针行程与喷嘴过流量的关系式,并与模型试验进行了对比,验证了公式的正确性。通过比较公式、孔口出流模型及模型综合特性曲线在大波动过渡过程中的计算结果,得出公式能更好地反映喷嘴流量特性,表明该公式可代替孔口出流模型指导初期设计阶段的冲击式电站大波动过渡过程计算。
There is no appropriate composite characteristic curve for large fluctuating transition process calculation at the preliminary design stage of the impulse turbine. Based on the layout characteristics of the impulse turbine nozzle component, this paper derives the formula of needle stroke length and nozzle flow as well as compares with the model experi ment. And the correctness of the formula is verified. Comparing the transition process results of the formula and the ori rice flow model, it draws a conclusion that the formula can reflect the nozzle flow characteristics well. So, we can utilize the formula to calculate the transition process in place of the orifice flow model.
出处
《水电能源科学》
北大核心
2012年第9期130-132,共3页
Water Resources and Power
基金
国家自然科学基金资助重点项目(51039005)
关键词
冲击式水轮机
喷嘴
流量特性
孔口出流模型
大波动过渡过程
impulse turbine l nozzle
flow characteristics
orifice flow model
large fluctuating transient process
