With a rotating cylinder electrode apparatus, the polarization behaviors of the mild steel and the stainless steel 0Cr18Ni9 in NaHCO 3 (0.5 M)+Na 2CO 3 (0.5 M) solution with and without erodent particles were inves...With a rotating cylinder electrode apparatus, the polarization behaviors of the mild steel and the stainless steel 0Cr18Ni9 in NaHCO 3 (0.5 M)+Na 2CO 3 (0.5 M) solution with and without erodent particles were investigated and compared. The results show that the rotation speed of cylinder hardly affects the polarization behavior of sample in solution without particles but exerts a great influence on that with particles. Increasing rotation speed, the free corrosion potential shifts to positive direction and the oxygen limiting current density increases. Both the mild steel and stainless steel 0Cr18Ni9 experience a significant increase of the mass loss by increasing erosion, and erosive wear was dominated by severe micro-plowing. The insufficient mechanical strength of both materials leads to a low resistance to particle removal. Increasing peripheral velocities of the rotating cylinder enhances the corrosion rate of the mild steel. The stainless steel 0Cr18Ni9, due to a high erosive wear, also suffers from similar erosion-corrosion damage, despite that its corrosion resistance is much higher than that of the mild steel.展开更多
基于计算流体力学(CFD),选用三维瞬态湍流动网格模型,对双头全金属单螺杆泵进行流体仿真分析,编写CG宏函数实现动网格中流域动边界的行星运动,仿真研究不同黏度和转速对泵工作效率的影响,同时对该型全金属螺杆泵在不同黏度和转速下进行...基于计算流体力学(CFD),选用三维瞬态湍流动网格模型,对双头全金属单螺杆泵进行流体仿真分析,编写CG宏函数实现动网格中流域动边界的行星运动,仿真研究不同黏度和转速对泵工作效率的影响,同时对该型全金属螺杆泵在不同黏度和转速下进行实验研究。结果表明:在稠油热采环境中,油液黏度较低(<50 m Pa·s),提高转速可以有效改善容积效率和泵效;在稠油冷采环境中,油液黏度较高(>50 m Pa·s),提高转速泵效先增大后减小,转速过大会引起定转子接触碰撞频率、油液对转子的正压力以及油液对转子的摩擦阻力的增大,使得泵效降低,容积效率维持在较高水平;该泵更适合于黏度较高液体的输送。展开更多
文摘With a rotating cylinder electrode apparatus, the polarization behaviors of the mild steel and the stainless steel 0Cr18Ni9 in NaHCO 3 (0.5 M)+Na 2CO 3 (0.5 M) solution with and without erodent particles were investigated and compared. The results show that the rotation speed of cylinder hardly affects the polarization behavior of sample in solution without particles but exerts a great influence on that with particles. Increasing rotation speed, the free corrosion potential shifts to positive direction and the oxygen limiting current density increases. Both the mild steel and stainless steel 0Cr18Ni9 experience a significant increase of the mass loss by increasing erosion, and erosive wear was dominated by severe micro-plowing. The insufficient mechanical strength of both materials leads to a low resistance to particle removal. Increasing peripheral velocities of the rotating cylinder enhances the corrosion rate of the mild steel. The stainless steel 0Cr18Ni9, due to a high erosive wear, also suffers from similar erosion-corrosion damage, despite that its corrosion resistance is much higher than that of the mild steel.
文摘基于计算流体力学(CFD),选用三维瞬态湍流动网格模型,对双头全金属单螺杆泵进行流体仿真分析,编写CG宏函数实现动网格中流域动边界的行星运动,仿真研究不同黏度和转速对泵工作效率的影响,同时对该型全金属螺杆泵在不同黏度和转速下进行实验研究。结果表明:在稠油热采环境中,油液黏度较低(<50 m Pa·s),提高转速可以有效改善容积效率和泵效;在稠油冷采环境中,油液黏度较高(>50 m Pa·s),提高转速泵效先增大后减小,转速过大会引起定转子接触碰撞频率、油液对转子的正压力以及油液对转子的摩擦阻力的增大,使得泵效降低,容积效率维持在较高水平;该泵更适合于黏度较高液体的输送。
