Open AccessInvestigation of the transient heat transfer to a supersonic air jet impinging on a high-temperature plate based on a discrimination-experiment method
Author(s) -
Ming-Xin Gao,
Jian Yang,
Yue Zhang,
Hua Shu
Publication year - 2022
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0264968
Subject(s) - supersonic speed , heat transfer , jet (fluid) , mechanics , thermal conduction , materials science , adiabatic process , transient (computer programming) , heat transfer coefficient , thermal conductivity , adiabatic wall , thermal , thermodynamics , physics , computer science , composite material , operating system
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.