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| 1 | Investigation on reversible pump turbine flow structures and associated pressure field characteristics under different guide vane openings显示文摘The use of reversible pump turbines(RPT) within pumped storage power plants goes with prolonged periods of off-design operating conditions, which leads to the onset of operating mode-dependent instabilities. In order to decrease the gravity of RPT flow instabilities and associated damages or even completely eliminate them, a deep understanding of its onset and development mechanism is needed. In line with this, the present study seeks to numerically investigate the onset and development mechanism of RPT unsteady flow structures as well as the evolutional characteristics of associated pressure pulsations throughout the RPT complete flow passage, under off-design conditions for three GVOs namely 17, 21, and 25 mm. The study results showed that low torque operating conditions and associated vaneless space back flow structures were the trigger of flow unsteadiness onset within the RPT vaneless space, the instabilities which grew to cause the S-shape characteristics appearance. Moreover, the runner flow unsteadiness was found to decrease with the GVO increase. On the other hand, the GVO increase worsened the pressure pulsation levels within RPT flow zones, where pressure pulsations within the vaneless space and flow zones in its vicinities were found to be the most sensitive to GVO changes. | BINAMA Maxime SU WenTao CAI WeiHua LI FengChen WEI XianZhu MUHIRWA Alex GONG RuZhi WEKESA David W | 2019 | Science China(Technological Sciences)2019，62，11： | 5 |
| 2 | 磨蚀对水斗式水轮机的水斗型线及性能影响的研究显示文摘在含沙水流中运行的水斗式水轮机,分水刃和缺口是斗叶上最容易受到磨损变形的部位。采用欧拉-拉格朗日法对水-气-砂三相流进行非定常计算,研究分水刃高度下降对流态及泥沙磨损的影响,以及分水刃高度、缺口深度变化对转轮外特性的影响。研究发现:分水刃高度下降会对流线产生影响,在进水侧区域诱发旋涡和湍流,致使流态紊乱,水力损失增加,从而造成转轮外特性下降。当分水刃高度下降2、5、10mm时,转轮的效率分别减少了0.22%、0.66%、5.98%。分水刃高度下降造成的斗叶型线变化,会影响泥沙颗粒对斗叶内壁面的磨损情况。分水刃下降的高度越大,分水刃区域的磨损越严重、磨损范围越大。缺口深度增加会减小斗叶工作面面积,造成转轮外特性下降。尤其是当缺口深度增加10mm时,效率降低了15.37%,转轮效率低于70%,在这种工况下运行,对射流能量的利用是非常不利的。 | 葛新峰 孙洁 蔡建国 张雷 张辉 王金亮 MAXIME Binama 郑源 | 2021 | 中国电机工程学报2021，41，21： | 4 |
| 3 | 水轮机顶盖螺栓受力特性研究显示文摘顶盖螺栓是连接水轮机顶盖与座环的重要连接件,顶盖螺栓的安全状态是水电站安全运行的重要保障。以某轴流式水轮机作为研究对象,建立了全三维流体模型和水轮机顶盖及螺栓结构模型,采用流固耦合方法将顶盖过流面压力分布水压力传递给水轮机顶盖,对现场电站螺栓采用中空测力传感器进行现场试验,将螺栓不同截面的等效应力分布与试验结果进行验证,研究表明:顶盖水压力随着水头和导叶开度的增大而增大,最大水头大开度工况顶盖总轴向压力值达到最大;螺栓不同位置截面应力分布不均,螺栓同时承受着轴向应力与弯曲应力,螺栓头部、螺栓与螺纹交接处相比螺栓比螺栓中部截面受力大;不同位置螺栓受力变化趋势一致验证了顶盖耦合面的水压力为轴对称分布的特性;开机时螺栓受力比停机时增加明显,较低负荷振动区,顶盖螺栓受力有所提升,在稳定运行区螺栓受力保持稳定;停机及三个稳定运行工况下数模计算的结果和现场试验吻合,验证了有限元计算的准确性,中空测力传感器能够比较准确的反应螺栓的轴向受力。 | 葛新峰 张敬 祝双桔 钱巨林 赵雷 郑圣义 郑源 徐旭 BINAMA Maxime | 2021 | 振动与冲击2021，40，17： | 4 |
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