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目的:利用数值模拟方法分析动态变化的受热面热流密度和入口速度对多冲击射流微小通道(MHSMIJ)的传热性能和温度波动特征的影响。创新点:1.提出MHSMIJ热行为数值模拟方法;2.分析受热面热流密度的振幅和周期对MHSMIJ行为的影响;3.分析冲击射流速度的振幅和周期对MHSMIJ动态热行为的影响;4.分析材料热物性参数对MHSMIJ的时间滞后效应的影响。方法:1.采用周期性函数来描述冲击射流的速度入口和受热面的热流密度的波动;2.利用数值模拟方法分析周期和振幅对MHSMIJ的动态热行为的影响。结论:1.受热面热流密度的波动周期对MHSMIJ行为的影响十分显著,MHSMIJ的时间滞后效应随着波动周期的增加而增加,其基底表面温度和表面传热系数也随之发生变化;2.受热面热流密度的波动振幅对MHSMIJ的温度波动产生显著的影响;3.冲击射流的入口速度的振幅对MHSMIJ的动态传热性能产生影响。
OBJECTIVE: To analyze the effect of dynamic heat flux density and inlet velocity on the heat transfer performance and temperature fluctuation of MJMIJ by numerical simulation. The innovation points: 1. Propose the numerical simulation method of MHSMIJ thermal behavior; 2. Analyze the influence of the amplitude and period of the heat flux density on the MHSMIJ behavior; 3. Analyze the impact of the amplitude and period of the impact jet velocity on the MHSMIJ dynamic thermal behavior; The influence of material thermophysical parameters on the time lag effect of MHSMIJ is analyzed. The periodic function is used to describe the fluctuation of heat flux density at the entrance and the heated surface of impinging jets.2. The effect of period and amplitude on the dynamic thermal behavior of MHSMIJ is analyzed by numerical simulation method. The results show that: 1. The period of the heat flux density heating cycle has a significant effect on the MHSMIJ behavior. The time lag effect of the MHSMIJ increases with the increase of the fluctuation period, and the substrate surface temperature and surface heat transfer coefficient also change.2. The fluctuating amplitude of the heat flux density on the heating surface has a significant effect on the temperature fluctuation of MHSMIJ.3. The amplitude of the inlet velocity of the impinging jet has an impact on the dynamic heat transfer performance of MHSMIJ.