This study compares detailed regime maps in the case of operation using the air of two Ranque tubes with circular and square working channels with identical inlet guides and identical outlets. The degree of air expansion and the fraction of a flow rate through a cold outlet vary in ranges of 2–8 and 0.2–0.8, respectively. It is observed for both tubes that, as the degree of expansion increases, the dependences of a volumetric flow rate and a cooling ratio on the fraction of a cold flow rate become invariant. It is revealed that the cooling ratio in a circular tube is 1.5–2.0 times greater than that in a square channel, with the volumetric flow rate therein being approximately 10% lower.

中文翻译：

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具有圆形和方形工作通道的 Ranque 管的状态分析

本研究比较了在使用具有圆形和方形工作通道的两个 Ranque 管的空气进行操作的情况下的详细状态图，这些管道具有相同的入口导向器和相同的出口。空气膨胀程度和通过冷出口的流量比例分别在 2-8 和 0.2-0.8 的范围内变化。观察到两种管子随着膨胀程度的增加，体积流量和冷却比对冷流量分数的依赖性变得不变。结果表明，圆管中的冷却比是方通道中的 1.5-2.0 倍，其中的体积流量大约低 10%。