针对3500 m3/h系列绞吸挖泥船在较短管线输送距离时采用缩口减小流量的问题,通过对舱内泥泵和水下泥泵的叶轮进行叶片改型优化,实现泥泵扬程和功率的降低,并将改型叶轮应用于南通海门某疏浚工程.结果表明,"新海鹭"轮泥泵更换改型叶轮后,在3.4 km排距下采用双泵串联输送粉砂土质泥浆,两泵功率降低约500 kW,油耗减少13.4％,施工180 h节约30 t燃油,达到节约能源的目的.

以上航局3000 m3等级耙吸挖泥船建造项目为依托,结合项目中4500 m3耙吸挖泥船耙头研制,深入研究耙臂冲水管系沿程阻力及喷嘴布置对耙头冲水的影响.采用数值模拟方法对4500 m3耙吸挖泥船耙头高压冲水管路及喷嘴流速进行了计算,依据高压冲水泵性能曲线开展工况点的匹配性分析.针对喷嘴附近局部过流面的流场分布,进一步优化耙头内部高压冲水过流区域形状和喷嘴结构形式,有效降低管路阻力,减小了高压冲水沿耙臂管路输送至喷嘴过程的能量损失,显著提高了喷嘴冲水流速,形成了与高压冲水泵工况点相匹配的耙头冲水管系和喷嘴设计方案.

Assuming a Hywind offshore floating wind turbine station used in China seas,we theoretically analyzed its torsional response under surge impact,water buoyancy,and damper suppression.Under restrictions of the station structure and the surge form, we designed three types of damper with the mechanism of tuning damping. After the simplified model, we used a partitioned solving and two-way coupling method to simulate the forced periodic torsional vibration of the Hywind station tower, which is interacted with surge impact. The numerical results are used for directing optimization, and the suppressing force amplitudes of the optimized dampers are closed to the theoretical values.The combined damper combines the advantages of the other two dampers;it depresses torsional amplitude of the turbine tower by 17% with 1.82% damping mass in the same space.It has further research and promotion value.