Ventilation of starting rotation device ventilation pipe is from Axial flow of swirl hole inner surface takes air leads to vacuum cavity, model existence of scale effect.
起旋室通气井通风系由旋流洞内表面轴向水流“挟带”空气而致空腔内气体压强减小进入，模型存在缩尺效应。
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The results of simulation indicate that there is a critical value for ventilation direction to transfer sheet cavity into supercavity.
Objective to evaluate the therapeutic effect of high frequency oscillatory ventilation (HFOV) combined with thoracic cavity occlusive drainage on neonatal pneumothorax.