Impinging jets are used industrially in various applications such as heating and cooling. However, multiple impinging jets (MIJ) create a complex flow field due to interference between the individual jets, which hinders heat transfer. In order to solve the problem of heat transfer performance in MIJ, a new control method must be developed. This study introduces intermittent control to 13 hexagonally arranged circular jets to investigate the possibility of control. In the intermittent control, the 13 jets are divided into three groups, and each group is intermittently issued. The distance between jets and the issuing period are changed as control parameters, and the heat transfer characteristics are evaluated using direct numerical simulation (DNS). The time-averaged velocity field revealed the effects of the intermittent period and the distance between jets on the flow characteristics, and the Nusselt number distribution on the wall surface indicated that the proposed method improves the heat transfer characteristics.

中文翻译：

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控制参数对间歇控制冲击射流传热性能影响的DNS分析

冲击射流在工业上用于各种应用，例如加热和冷却。然而，多个冲击射流 (MIJ) 由于各个射流之间的干扰而产生复杂的流场，从而阻碍了热传递。为了解决MIJ中的传热性能问题，必须开发一种新的控制方法。本研究对13个六边形排列的圆形射流引入间歇控制，以探讨控制的可能性。在间歇控制中，13个喷射器分为三组，每组间歇发出。改变射流之间的距离和喷射周期作为控制参数，并使用直接数值模拟（DNS）评估传热特性。时均速度场揭示了间歇周期和射流间距对流动特性的影响，壁面上的努塞尔数分布表明该方法改善了传热特性。