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Influence of geometry and operating parameters on the stability response of single-phase natural circulation loop

机译：几何形状和运行参数对单相自然循环回路稳定性响应的影响

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摘要

An investigation on the influence of different geometric and operating parameters on the stability of a single-phase rectangular natural circulation loop having horizontal heating-cooling orientation is presented. The major objective is to identify the most plausible option of expanding stable zone of operation, which also improves steady-state flow. Decreasing loop diameter stabilizes the flow, but also reduces steady-state flow rate drastically. Increasing vertical length has been identified as a much better option, as that yields the dual benefit of enhanced stability margin and a slightly enhanced steady-state flow rate. A correlation for predicting the threshold of instability has also been proposed in terms of four geometric variables, namely, inner diameter, height, horizontal length and length of heating section. Introduction of minor losses in the form of valves or orifices has been found to be a weak option, both due to rapid deterioration of steady-state flow and a strong dependence of minor loss requirement on power supply. Tilting the loop from vertical, while maintaining the rectangular shape, has been observed to be a much better choice. A small tilt angle in the range of 10°-l 5° stabilizes the loop even for very high power input, with a fairly small reduction in steady-state flow.
机译：研究了不同的几何和工作参数对具有水平加热-冷却方向的单相矩形自然循环回路稳定性的影响。主要目标是确定扩大稳定运行区域的最合理选择，这也可以改善稳态流量。减小回路直径可稳定流量，但也可大幅降低稳态流量。增加垂直长度已被认为是更好的选择，因为这带来了增加的稳定性裕度和稍微增加的稳态流速的双重好处。还已经根据四个几何变量，即内径，高度，水平长度和加热部分的长度，提出了用于预测不稳定性阈值的相关性。已经发现以阀或节流孔的形式引入较小的损失是一个较差的选择，这既是由于稳态流量的迅速恶化，也是由于较小的损失要求对电源的强烈依赖。从环路垂直倾斜，同时保持矩形形状，已被认为是更好的选择。即使对于非常高的功率输入，在10°-1-5°范围内的小倾斜角也可以使环路稳定，并且稳态流量的减小也很小。

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