| Citation: | WANG Guowang, SUN Wenjing, ZHANG Jingzhou, et al. Numerical investigation on flow and heat transfer characteristics of pulsed jet impingement in a crossflow[J]. Journal of Aerospace Power, 2025, 40（2）：20220546 doi: 10.13224/j.cnki.jasp.20220546
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A numerical study was performed in the present work for a single round-jet impingement in the crossflow, to illustrate the effects of pulsating excitation on flow and heat transfer characteristics of pulsed jet impingement under a fixed jet Reynolds number (1×104) and different crossflow-to-jet velocity ratios (0.1—0.4) and pulsating frequencies (20—200 Hz). The results showed that the scarf-vortex was of the featured vortical structure in the pulsed jet impingement in a crossflow. When compared with the steady jet, the flow deflection of pulsed jet toward the crossflow direction was obviously weakened. Even in a strong crossflow situation, the kidney-vortex-dominated flow structure in the steady jet impingement did not appear in the pulsed jet impingement. Consequently, the convective heat transfer on the target was effectively improved by using pulsed jet impingement in a stronger crossflow. Because of the complexity in the interaction between pulsed jet and crossflow, the convective heat transfer on impinging target was tightly associated with the pulsating frequency and crossflow-to-jet velocity ratio. In the present parameters, a relatively optimal pulsating frequency of 100 Hz was suggested.
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