Abstract: A series of numerical simulations for multi-pulsating jets with phase difference are carried out in order to obtain impinging heat transfer characteristics. The results are compared with changed phase difference in jet modes and values and pulse frequency. Jet modes include the symmetrically increasing phase difference (mode A), the gradually increasing phase difference (mode B) and alternative phase difference (mode C). It can be found that mode B with gradually increasing phase mode has the best heat transfer characteristics within this research scope. When the phase difference lies between 0°-180°, the heat transfer characteristics become stronger with the increase of phase difference. When the phase difference is 120°, the heat transfer characteristics are best-distributed on the whole plate. Such well-distribution of heat transfer is also influenced by frequency. And the heat transfer characteristics are better-distributed when the frequency increase in the range of 0-10Hz. However, the influence of frequency is less than those of phase difference in jet modes and values.

Key words: phase difference, jet impingement, numerical simulation, convection, heat transfer

摘要： 采用数值模拟的方法对带相差的多喷嘴射流冲击传热进行数值模拟，分别得到不同相差和不同射流频率条件下的冲击传热效果。结果显示，在不同的射流喷射模式下，按相差顺序增加方式（B型）喷出的射流传热效果最好，两喷嘴间的相差为0°～180°之间时，传热板的传热效果随着相差角度的增加，传热效果得到增强，且在相差为120°时，整个传热板传热效果最均匀；在频率为0～10Hz时，频率越大，整个传热板传热越均匀，但频率的影响小于相差及喷射模式的影响。

关键词: 相差, 射流冲击, 数值模拟, 对流, 传热