结果表明，气泡频率和含气率在喷头附近分布很高，在其它部位分布是均匀的。
The results show that bubble frequency and gas holdup distributed highly surrounding the blade and uniformly in rest of the bath.
随着声波频率的升高，空化气泡的初始半径取值区间越来越小，空化振荡也越来越弱。
With the increase of driving frequency, the initial radii range of cavitation bubbles decrease, and the oscillation intensity reduces.
同一气泡上下游界面振荡具有相同特征频率（频段）。
The upper and lower caps of one elongated bubble oscillated at the same characteristic frequency (band).
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