School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, China.
School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan, China.
PLoS One. 2022 Mar 14;17(3):e0264968. doi: 10.1371/journal.pone.0264968. eCollection 2022.
A discrimination-experiment method is developed to investigate the transient heat transfer of air jet impingement by discretizing the solid domain into mutually adiabatic test cylinders. This method can not only reduce the influence of the transverse heat transfer of a solid domain on the heat transfer characteristics of the jet but can also simplify the two-dimensional or three-dimensional heat conduction problem into a one-dimensional problem. Moreover, the discrimination-experiment method eliminates the embedment of thermocouples into the solid domains, further improving the accuracy and reliability of the proposed method. The transient heat transfer characteristics of a supersonic air jet impinging on a high-temperature target (860°C) and the effects of thermo physical parameters, such as the density, specific heat capacity, thermal conductivity and nozzle-to-target distance (H/D = 3, 4, and 5) are analyzed in detail using the discrimination-experiment method. The results provide important guidance for the thermal design of supersonic air jet impingement.
提出了一种分区实验方法来研究空气射流冲击的瞬态传热，即将固体域离散为相互绝热的测试圆柱。该方法不仅可以减小固体域的横向热传递对射流传热特性的影响，而且可以将二维或三维热传导问题简化为一维问题。此外，分区实验方法消除了热电偶嵌入固体域的问题，进一步提高了该方法的准确性和可靠性。利用分区实验方法详细分析了超音速空气射流冲击高温目标（860°C）的瞬态传热特性以及密度、比热容、热导率和喷口-目标距离（H/D=3、4 和 5）等热物理参数的影响。结果为超音速空气射流冲击的热设计提供了重要指导。
