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本文在低频条件下，用导荧式压力传感器对比性地量测了掺气与不掺气射流作用于水垫塘底部的脉动压强．频谱分析结果表明：射流掺气后，水垫塘底部脉动压强的功率谱变化幅度增大。并随水垫深度的增加而减弱；掺气与不掺气情形，其功率谱没有明显的优势频率，是一白噪声谱；在自相关函数日中，不掺气的Ｒ（ι）～ι关系曲线变化较缓，掺气后变化剧烈，并出现负值；掺气还使时间积分比尺变小，频率增大．
In this paper, under the condition of low frequency, the pulsating pressure acting on the bottom of the plunge pool with aerated and non-aerated jet was comparatively measured by the guided-flow pressure sensor. The results of spectrum analysis show that the amplitude of the power spectrum of the pulsating pressure at the bottom of the plunge pool increases after the jet is aerated. And decreases with the increase of the depth of the water cushion. In the case of aeration and without aeration, the power spectrum has no obvious dominant frequency and is a white noise spectrum. In the autocorrelation function day, the un-aerated R (ι) ~ ι The relationship curves change slowly, and the change is fierce after aeration, and negative values appear. The aeration also makes the time integral scale smaller and the frequency increases.