In order to evaluate the effects of the short blade locations on the anti-cavitation performance of the splitterbladed inducer and the pump, 5 inducers with different short blade locations are designed. Cavitation sim...In order to evaluate the effects of the short blade locations on the anti-cavitation performance of the splitterbladed inducer and the pump, 5 inducers with different short blade locations are designed. Cavitation simulations and experimental tests of the pumps with these inducers are carried out. The algebraic slip mixture model in the CFX software is adopted for cavitation simulation. The results show that there is a vortex at the inlet of the inducer. Asymmetric cavitation on the inducer and on the impeller is observed. The analysis shows that the short blade locations have a minor effect on the internal flow field in the inducer and on the external performance of the pump, but have a signi ficant effect on the anti-cavitation performance. It is suggested that the inducer should be designed appropriately. The present simulations found an optimal inducer with better anti-cavitation performance.展开更多
目的提升钛合金(TC4)叶片表面性能,解决失效问题。方法实验采用激光局部气体氮化工艺代替传统氮化工艺,利用2 k W柔性光纤耦合半导体激光器在钛合金(TC4)基体表面采用气体氮化的方法制备TiN表面改性层。采用摩擦磨损试验机和改制的汽蚀...目的提升钛合金(TC4)叶片表面性能,解决失效问题。方法实验采用激光局部气体氮化工艺代替传统氮化工艺,利用2 k W柔性光纤耦合半导体激光器在钛合金(TC4)基体表面采用气体氮化的方法制备TiN表面改性层。采用摩擦磨损试验机和改制的汽蚀装置分别测试了氮化层与基体(TC4)的耐磨性与抗汽蚀性能。结果摩擦磨损实验后,激光氮化层的质量损失为2.3 mg,基体TC4的质量损失为20.2 mg,激光氮化层的损失质量为基体TC4的11.3%,激光氮化层抗磨损性能相较基体TC4提高了7倍。TC4基体汽蚀损失的质量为4.08 mg,而氮化层的质量损失为1.13 mg,氮化层的抗汽蚀性能比基体提高了2.61倍。结论采用半导体激光气体氮化钛合金叶片能够得到分布着大量TiN枝晶的氮化层,提高表面耐磨损性能,氮化层中的TiN枝晶构成的网篮状组织对其表面抗汽蚀性能也有所提高。展开更多
基金Supported by the National Natural Science Foundation of China(51406185,51276172)the China Scholarship Council Project in 2012(201208330325)+1 种基金the Third Level 151 Talent Project in Zhejiang Provincethe Professional Leader Leading Project in 2013(lj2013005)
文摘In order to evaluate the effects of the short blade locations on the anti-cavitation performance of the splitterbladed inducer and the pump, 5 inducers with different short blade locations are designed. Cavitation simulations and experimental tests of the pumps with these inducers are carried out. The algebraic slip mixture model in the CFX software is adopted for cavitation simulation. The results show that there is a vortex at the inlet of the inducer. Asymmetric cavitation on the inducer and on the impeller is observed. The analysis shows that the short blade locations have a minor effect on the internal flow field in the inducer and on the external performance of the pump, but have a signi ficant effect on the anti-cavitation performance. It is suggested that the inducer should be designed appropriately. The present simulations found an optimal inducer with better anti-cavitation performance.
