The numerical results show that with the adaptive passive control, the separation bubble length was reduced to 45% of its original length, and the low total pressure recovery coefficient was improved.

数值结果表明，施加自适应无源被动控制后，分离区长度减小为无控制时的45%，控制区域的总压恢复系数和流场均匀性提高。

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The impact of starting pressure gradient must be considered due to existence of starting pressure gradient and recovery difficulty during the development of low permeability oil reservoirs.

低渗透油田由于存在启动压力梯度，开采难度很大，因此，在低渗透油田开发时必须考虑启动压力梯度的影响。

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At the stage of pressure higher than bubbling point, the imitated oil shows an elastic characteristic with a very low recovery;

结果显示：（1）高于泡点压力阶段，模拟油显现弹性驱动特征，采收率很低；

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