This article deals with the comparative investigation of instability phenomenon in supercritical CO₂ based regular natural circulation loop and a new modified Tesla natural circulation loop. Two-dimensional computational fluid dynamics simulation is carried out for square loops. Fluid flow behaviour and performance of both the loops are determined over a range of pressures (80–100 bar) and heat inputs (500–2000 W). Results show that the use of a modified Tesla valve leads to better stabilization for all supercritical pressures and heat inputs. It is also found that loop with Tesla mitigates the temperature and velocity oscillations without reducing the heat transfer performance. A good agreement with existing correlations is also obtained in the present study. The unidirectional fluid flow circulation achieved in loop with Tesla valve, makes it an efficient technique to combat instability.

本文涉及超临界CO ₂失稳现象的比较研究。常规自然循环回路和新的特斯拉自然循环回路。对方形回路进行了二维计算流体动力学模拟。两个回路的流体流动特性和性能是在一定压力（80–100 bar）和热量输入（500–2000 W）的范围内确定的。结果表明，改进的Tesla阀的使用可为所有超临界压力和热量输入带来更好的稳定性。还发现具有特斯拉的回路减轻了温度和速度振荡，而没有降低传热性能。在本研究中也获得了与现有相关性的良好协议。通过Tesla阀实现的单向流体循环循环，使其成为抵抗不稳定的有效技术。