超临界二氧化碳自然循环回路的稳态行为
The steady behavior of the supercritical carbon dioxide natural circulation loop
AI总结：
本研究实验探究超临界二氧化碳自然循环回路的稳态行为，提出广义预测方程并验证其准确性，同时指出粘性损失对流量的限制，为新型超临界自然循环设施开发提供支持。
摘要：
本文研究了热力学超临界自然循环回路（NCLs）的稳态行为。实验获得了超临界二氧化碳在约化压力1.1-1.5、温度20-65°C范围内的稳态结果。通过遍历一组等容线达到了不同的热力学状态。提出了一个用于预测稳态的广义方程，并利用实验数据评估了其性能。结果表明，所提出的预测方程能够准确捕捉由热力学状态、加热高度和驱动高度变化引起的质量流量变化。然而，回路仪器及换热设备附近增强的粘性损失显著限制了稳态流量。最后，这些发现被提出以助力开发安全、新型的超临界自然循环设施。
英文摘要：
The steady state behavior of thermodynamically supercritical natural circulation loops (NCLs) is investigated in this work. Experimental steady state results with supercritical carbon dioxide are presented for reduced pressures in the range of 1.1-1.5, and temperatures in the range of 20-65 °C. Distinct thermodynamic states are reached by traversing a set of isochors. A generalized equation for the prediction of the steady state is presented, and its performance is assessed using empirical data. Changes of mass flow rate as a result of changes of thermodynamic state, heating- and driving height are shown to be accurately captured by the proposed predictive equation. However, the enhanced viscous losses in the instrumentation of the loop and in the proximity of heat transfer equipment are shown to significantly limit the steady state flow rate. Subsequently, the findings are put forward in aid of the development of safe, novel supercritical natural circulation facilities.
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