Abstract

Operating characteristics of aeronautic and marine vehicles, as well as hydraulic machines designed for various purposes are largely affected by flow separation. Therefore, control of separated flows is an extremely important problem for modern aviation and marine engineering. Based on dynamometric measurements of forces and torque acting on model hydrofoils and the ship rudder, jet control of flow separation in cavitation-free and cavitation regimes at low and high angles of attack is studied. It is shown that generation of a near-wall jet can ensure a separationless flow around test models at angles of attack greater than 30 degrees. In this case, the lift coefficient of the hydrofoil can increase approximately by two or three times. Pressure fluctuations near the body and in its wake vanish due to flow stabilization; as a result, oscillations of hydrodynamic loads on the body decrease.

中文翻译：

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水翼流分离的喷射控制：基于力和扭矩测量的性能评估

摘要

流动分离在很大程度上影响了航空和船舶车辆以及为各种目的而设计的液压机的运行特性。因此，分离流的控制对于现代航空和海洋工程是极为重要的问题。基于作用在模型水翼和船舵上的力和扭矩的动态测量，研究了在低攻角和高攻角下在无气蚀和空化状态下的射流控制。结果表明，近壁射流的产生可以确保在攻角大于30度的情况下围绕测试模型的无分离流动。在这种情况下，水翼的升力系数可以增加大约两倍或三倍。由于流量稳定，人体附近及其尾部的压力波动消失；结果是，