The aim of this study is to investigate CO2 two-phase nozzle flow in terms of both experimental and analytical aspects for the optimum design of two-phase flow nozzle of CO2 two-phase flow ejector. In the experiment, ...The aim of this study is to investigate CO2 two-phase nozzle flow in terms of both experimental and analytical aspects for the optimum design of two-phase flow nozzle of CO2 two-phase flow ejector. In the experiment, it is measured that the temperature profile in the stream-wise direction of a divergent-convergent nozzle through which CO2 in the supercritical pressure condition is blown down into the atmosphere. In the analysis, a one-dimensional model which assumes steady, adiabatic, frictionless, and equilibrium is proposed. In the convergent part of the nozzle the flow is treated as single-phase flow of liquid, whereas in the divergent part the flow is treated as separated two-phase flow with saturated condition. The analytical results indicate that the temperature and the pressure decrease rapidly in the divergent part, and the void fraction increases immediately near the throat. Although this analysis is quite simple, the analytical results can follow the experimental results well within this study.展开更多
针对某型号小吨位模锻锤直通管接头,提出了一种一模四件的接头成形方法。通过分析接头的形状特点,结合现有31.5 k J模锻锤的成形能量,将接头原有的一模一件的成形方案优化为一模四件的成形方案。利用改变接头旋转角度并计算模膛最小壁...针对某型号小吨位模锻锤直通管接头,提出了一种一模四件的接头成形方法。通过分析接头的形状特点,结合现有31.5 k J模锻锤的成形能量,将接头原有的一模一件的成形方案优化为一模四件的成形方案。利用改变接头旋转角度并计算模膛最小壁厚的方式,对接头的模膛排布进行多次设计,优选出最佳的一模四件排布方式。对不同坯料尺寸在不同打击效率下的成形过程进行模拟,通过对比分析得到接头一模四件的最佳锻造成形工艺。最后,通过实际生产验证了该工艺的可行性与稳定性。结果表明,通过模膛排布方案优选与工艺优化,接头的生产效率提高了4倍,材料利用率提高了11%。展开更多
文摘The aim of this study is to investigate CO2 two-phase nozzle flow in terms of both experimental and analytical aspects for the optimum design of two-phase flow nozzle of CO2 two-phase flow ejector. In the experiment, it is measured that the temperature profile in the stream-wise direction of a divergent-convergent nozzle through which CO2 in the supercritical pressure condition is blown down into the atmosphere. In the analysis, a one-dimensional model which assumes steady, adiabatic, frictionless, and equilibrium is proposed. In the convergent part of the nozzle the flow is treated as single-phase flow of liquid, whereas in the divergent part the flow is treated as separated two-phase flow with saturated condition. The analytical results indicate that the temperature and the pressure decrease rapidly in the divergent part, and the void fraction increases immediately near the throat. Although this analysis is quite simple, the analytical results can follow the experimental results well within this study.
文摘针对某型号小吨位模锻锤直通管接头,提出了一种一模四件的接头成形方法。通过分析接头的形状特点,结合现有31.5 k J模锻锤的成形能量,将接头原有的一模一件的成形方案优化为一模四件的成形方案。利用改变接头旋转角度并计算模膛最小壁厚的方式,对接头的模膛排布进行多次设计,优选出最佳的一模四件排布方式。对不同坯料尺寸在不同打击效率下的成形过程进行模拟,通过对比分析得到接头一模四件的最佳锻造成形工艺。最后,通过实际生产验证了该工艺的可行性与稳定性。结果表明,通过模膛排布方案优选与工艺优化,接头的生产效率提高了4倍,材料利用率提高了11%。
