The features of push-pull ventilation were introduced. In order to investigate the flow characteristics of low velocity push-pull ventilation, a series of experiments were carried out with different space between air diffuser and air suction (interval L = 3. 5 - 3. 8m). The results showed that low velocity push-pull airflow enters conflux before jet origination finishing while L<3. 8m(There was no jet main section in flow field). The axial velocity of high velocity push-pull ventilation varied following power function. There was large deviation between the empirical equation of high velocity push-pull ventilation and experiments of low velocity push-pull ventilation. The former is not fit for low velocity Push-pull ventilation. Therefore, the empirical equations of high velocity push-pull ventilation are not suitable for representing the peculiarities of low velocity push-pull ventilation.%介绍了吹吸式通风气流的特点,并对吹吸风口间距3.5～3.8m时的低速流场的吹吸式通风气流流场的规律特性进行了实验研究.结果表明,当吹吸风口间距小于3.8m时,低速流场吹吸式通风的气流在射流起始段未结束时就进入了汇流段(吹吸气流流场中未出现射流主体段).高速流场吹吸式通风的轴心速度经验公式与低速流场的吹吸式通风实验结果式对比分析,发现两者之间存在较大的偏差.高速流场吹吸式通风的轴心速度经验公式不适用于描述低速流场吹吸式通风轴心速度的规律特性.
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