【摘要】 超/亚临界流体急速泄压过程具有显著的节流膨胀效应，导致流动过程气液相变强度较常规两相流过程存在明显差别。针对这个问题，构建了流动过程分段节流膨胀模型，引入状态方程计算等焓过程的温度变化及相应产生的相变源，并耦合入流动相变方程，使数值模拟结果更符合迅速泄压过程的流动相变特性。在此基础上，提出以反流式特斯拉阀结构作为泄压部件的概念，并进行数值模拟分析和优化设计。综合考虑案例工况、流速、降压效果、加工特性等因素，该反流特斯拉阀降压部件的优化参数：水力直径为10 mm、阀的半圆半径为20 mm、阀角为40°～60°。更多还原

【Abstract】 Rapid pressure relief of sup/subcritical fluids has significant throttling and expansion effects, which leads to a significant difference in the intensity of vapor-liquid phase transition in flow processes compared with a typical two-phase flow process. A segmented throttling expansion model of the flow process was constructed to solve this problem. Equation of state was introduced to calculate temperature changes under the isenthalpic condition, which was coupled into the flow phase change equation, thus the numerical simulation results were more in line with the flow phase change characteristics of the rapid pressure relief process. A concept of counter-flow Tesla valve structure as a pressure relief component was proposed after the above study, and numerical simulation analysis and optimization design were carried out. Considering case conditions, flow rate,pressure relief effect, processing characteristics and other factors, the optimized parameters of this counter-flow Tesla valve pressure relief component were obtained as 10 mm in hydrodynamic diameter, 20mm in semi-circular radius of the valve, and 40°-60° in valve angle.更多还原