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以截面尺寸为50 mm×2 mm的矩形并联双通道为实验本体,进行12~15 MPa的压力下密度波流动不稳定与沸腾临界的实验研究。研究发现:在高压条件下,随着压力和质量流速的增加,发生沸腾临界的热工参数范围扩大,而流动不稳定区域相应缩小。通过将热工参数无量纲化,在相变数(Npch)-过冷度数(Nsub)图上绘制了沸腾临界线及不稳定边界,揭示了热工参数对流动不稳定与沸腾临界存在区域的影响机制。
A rectangular parallel double tunnel with a cross section of 50 mm × 2 mm was used as the experimental body, and experimental studies on the instability and boiling critical of the density wave under 12 ~ 15 MPa were carried out. The results show that under the condition of high pressure, with the increase of pressure and mass flow rate, the thermal parameter range of boiling critical enlarges and the flow instability area shrinks correspondingly. Through the non-dimensional thermal parameterization, the critical boiling point and the unstable boundary are plotted on the Npch-Nsub diagram, and the thermal parameters are found to be sensitive to the instability of flow and the critical boiling region Influence Mechanism.