| Abstract: | The third flow blockage regime associated with the finite length of the perforated tunnel walls is investigated. In the case of infinitely long permeable boundaries blockage is impossible, since all the air displaced by the body can flow out through the walls even when their permeability is very low. If, however, the length of the permeable boundary is finite, blockage is in principle possible, given a low degree of permeability.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 3, pp. 151–157, May–June, 1991.The authors are grateful to Yu. B. Lifshits for useful comments. |
