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用水中麦克风检出高温金属淬火时产生的沸腾噪声,探讨其频率特性。结果表明,在观察的整个频域内(～20kHz),沸腾阶段中泡核沸腾的声压电平非常高,特别是在10k～20kHz的高频域内,无论哪种液温下,都比蒸气膜阶段中膜状沸腾时的声压电平要高得多。根据这种特性,仅取出沸腾噪声中10k～20kHz的高频成分,观察其声压随时间变化的情况。试验证明,运用这种方法能够容易地把握淬火时的冷却阶段和沸腾状态的变化。
The microphone in water is used to detect the boiling noise generated by high-temperature metal quenching and the frequency characteristics are discussed. The results show that the sound pressure level of nucleate boiling in the boiling stage is very high throughout the observed frequency range (~ 20 kHz), especially in the high frequency range of 10 k ~ 20 kHz, regardless of the liquid temperature The sound pressure level during membrane boiling is much higher in the stage. According to this characteristic, only high-frequency components of boiling noise of 10k to 20kHz are taken out, and the sound pressure changes with time. Experiments show that the use of this method can easily grasp the quenching of the cooling stage and the boiling state changes.