介绍了为九子溪电站水轮机增容研制的新型转轮 .实际运行结果表明 ,在电站工况不变和未采取其他措施情况下 ,新转轮使原机组功率增容相对幅值达 1 5 .3% .机组在不利的小负荷工况下运行近 40 0 0 h,未见磨蚀痕迹 ,抗空蚀、抗磨蚀性能优于原转轮 ,新转轮完全可替代老的 HL70 2型号水轮机转轮 This paper introduces a new runner developed for capacity expansion of Jiubizi Hydro Turbine.The actual operation results show that under the condition of unchanged power station and no other measures, the new runner makes the relative power capacity increase of the original unit reach 15 .3%. The unit operated under unfavorable small load conditions for nearly 400h, no abrasion traces, anti-cavitation erosion and anti-erosion performance better than the original runner, the new runner can completely replace the old HL70 2 model turbine Runner