频率波动范围对家用微波炉加热模式的影响

从频率的波动范围入手,基于数值模拟的手段,研究在多模腔体设计下,实现食品热形可重复的方法。首先测量了某家用微波炉在空腔和负载加热时的频率变化,并根据其物理模型建立了数值模型,利用验证后的数值模型分析频率波动范围对受热食品温度分布的影响。结果表明:家用微波炉加热时,其加热频率随时间不断变化,当频率波动范围较大时,即使加热同一规格的食品,得到的温度分布也不相同;随着频率波动范围的缩小,食品的温度分布越来越稳定,当频率波动范围缩小为中心频率±2MHz时,受热食品的温度分布不再随频率的波动而变化。因此在多模设计的加热腔体内,可以通过控制家用微波炉的频率波动范围实现食品的稳定可重复加热。

Effect of frequency shifts range on heating pattern of domestic microwave oven

In order to maintain the stability of heating, the effect of frequency shifts range on heating pattern of domestic microwave was invested based on the numerical simulation method. In this study, the frequency of a microwave oven was measured under no-load and load conditions and a computational simulation model was developed to investigate the effect of frequency shifts on heating pattern of microwave heating. The results showed that the frequency of microwave was constantly changing during microwave heating in the oven; when the frequency shifts was large, the temperature distribution was not stable even heating the same food; the heating pattern is more stable as the frequency shifts reduced; when the range of frequency is limited to the centre frequency ±2 MHz, the heating pattern of food heated in microwave oven would be almost consistent.