This paper analyzes the relationship between pressure ratio and volumetric of refrigerats while sieving the available replacement for R12. It is concluded that the actual volumetric capacity of refrigerants should be ...This paper analyzes the relationship between pressure ratio and volumetric of refrigerats while sieving the available replacement for R12. It is concluded that the actual volumetric capacity of refrigerants should be comparable to that of precent refigerants, which is proved by correspondent experimental research. Then several optimum formula and matched principles are given.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This paper analyzes the relationship between pressure ratio and volumetric of refrigerats while sieving the available replacement for R12. It is concluded that the actual volumetric capacity of refrigerants should be comparable to that of precent refigerants, which is proved by correspondent experimental research. Then several optimum formula and matched principles are given.
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。
