This paper sets the theoretical and numerical method predicting the unsteady pressure distribution on the propeller blade surface by using perturbation potential based on surface panel method.

本文建立了扰动速度势面元法预报螺旋桨表面非定常压力分布的理论和数值方法。

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To deal with the potential problem that some farmers might get disillusioned and withdraw early - creating perturbation - each group will have to deposit enough money into a bank account in advance to cover the entire cost of a four-year operation.

BBC: Badger cull heads for further consultation