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2. 发明申请

WO2006105174A2 METHOD OF REDUCING DRAG AND INCREASING LIFT DUE TO FLOW OF A FLUID OVER SOLID OBJECTS 审中-公开
标题翻译：由于流体在固体物体上流动而导致拖曳减少和提升的方法
公开(公告)号：WO2006105174A2
公开(公告)日：2006-10-05
申请号：PCT/US2006/011430
申请日：2006-03-29
申请人： SINHATECH , SINHA, Sumon, K. , SINHA, Sumontro
发明人： SINHA, Sumon, K. , SINHA, Sumontro
IPC分类号： B64C1/38
CPC分类号： F15D1/12 , B61D17/02 , B62D35/00 , B64C21/08 , B64C21/10 , B64C23/005 , B64C2230/06 , Y02T30/32 , Y02T50/166
摘要： A method for reducing drag, increasing lift and heat transfer using a de-turbulating device is disclosed, with the preferred form of the deturbulator being a flexible composite sheet. The flexible composite sheet comprising a membrane, a substrate coupled to the membrane, and a plurality of ridges coupled between the membrane and the substrate, wherein a vibratory motion is induced from the flow to at least one segment of a membrane spanning a distances, wherein the vibratory motion is reflected from at least one segment of the membrane to the flow, and; wherein a reduction in fluctuations is caused in the flow pressure gradient and freestream velocity U at all frequencies except around f, where f » U/s. hi one embodiment, the flexible composite sheet can be wrapped around a blunt leading edge of a plate facing an incoming flow of fluid, hi another embodiment, the flexible composite sheet can also be wrapped around one or more regions of an aerodynamic surface where a flow pressure gradient changes from favorable to adverse, hi another embodiment, the flexible composite sheet is replaced with a plurality of plates coupled to a substrate, wherein the plurality of plates has edges that interact with a fluid flow similar to a compliant surface. A method of adding a system of small viscous sublayer scale (around 30-80 micron height) backward and /or forward facing steps on the surface of an airfoil or other 2-D or 3-D streamlined aerodynamic body is disclosed, where the backward facing step is in a favorable pressure gradient and forward facing step is in an adverse pressure gradient, so as to speed up the freestream flow over the front portion of the airfoil or body and reduce skin friction drag by creating a marginally separated thin (0.1 to 10 microns) slip layer next to the wall behind the backward facing step and extending a significant distance behind said step. This method reduces the drag and increases lift if the body is a wing. Also the same method can be applied to a bluff body, such as an automobile to reduce flow separation induced drag by stabilizing the wake flow and making it appear to the flow as a solid streamiling extension of the original body. The gas mileage of a vehicle improves when treated in this manner.
摘要翻译：公开了一种用于使用去湍流装置来减小阻力，增加升力和传热的方法，其中该去振器的优选形式是柔性复合片材。所述柔性复合片材包括膜，耦合到所述膜的基底以及耦合在所述膜和所述基底之间的多个脊，其中从所述流引起的振动运动到跨越一段距离的膜的至少一个节段，其中振动运动从膜的至少一个区段反射到流动，并且; 其中在除了f附近的所有频率处的流动压力梯度和自由流速U引起波动的减小，其中f' 我们。在一个实施方案中，柔性复合片材可以缠绕在面对流入流体流的板的钝前缘上。在另一个实施方案中，柔性复合片材还可以缠绕在空气动力学表面的一个或多个区域周围，压力梯度从有利变为不利。在另一个实施方案中，柔性复合片材用多个联接至基材的板代替，其中所述多个板具有与类似柔顺表面的流体流相互作用的边缘。公开了一种在翼型或其他2-D或3-D流线型空气动力学体的表面上添加小粘性亚层规模（大约30-80微米高）的向后和/或向前台阶的系统的方法，其中向后面向前的步骤处于有利的压力梯度，并且朝前的步骤处于不利的压力梯度，以加速翼型或本体的前部上方的自由流动，并通过产生边缘分离的薄（0.1至 10微米）位于后向台阶后面的壁上的滑动层，并在所述台阶后面延伸显着的距离。如果身体是机翼，这种方法可以减少阻力并增加升力。同样的方法也可应用于诸如汽车之类的非流线型体，以通过稳定尾流并使流体看起来像原始物体的固体流动延伸部分来减少流动分离引起的阻力。以这种方式处理时，车辆的耗油量有所提高。

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