| Citation: | LÜ Yuanwei, ZHAO Yunduo, ZHANG Jingzhou, et al. Experiment on convective heat transfer of pulsed chevron jet impingement on flat plate[J]. Journal of Aerospace Power, 2023, 38（4）：787-794 doi: 10.13224/j.cnki.jasp.20210538
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An experimental investigation was performed to study the convective heat transfer characteristics of pulsed chevron jet impingement on a flat plate, by using infrared imaging technique. The pulsed jet was fixed at a specific duty cycle （DC） of 0.5, the experiments were conducted under Reynolds number of 5000−20000, Dimensionless impingement spacing of 2−8 and working frequency of 10−25 Hz. Results indicated that the local Nusselt number distribution in the vicinity of jet stagnation presented a lobed pattern resembling the shape of the configuration. The pulsed chevron jet was confirmed to be capable of enhancing the jet impingement heat transfer related to the pulsed round jet. Under Reynolds number of 10000 and working frequency of 15 Hz, the convective heat transfer in the vicinity of jet stagnation could be increased by 20%−30% with the use of pulsed chevron jet, when compared with the pulsed round jet. In general, the heat transfer characteristics in the pulsed chevron jet impingement were found somewhat distinct from that in the steady chevron jet impingement as well as the pulsed round jet impingement, due to the inherent interaction of active excitation by the pulsation and passive excitation induced by chevron nozzle.
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