|
A slipstream is a region behind a moving object in which a wake of fluid (typically air or water) is moving at velocities comparable to the moving object, relative to the ambient fluid through which the object is moving.〔(Recent studies of Train Slipstreams by Johnson, Dalley, and Temple )〕 The term slipstream also applies to the similar region adjacent to an object with a fluid moving around it. "Slipstreaming" or "drafting" works because of the relative motion of the fluid in the slipstream. A slipstream created by turbulent flow has a slightly lower pressure than the ambient fluid around the object. When the flow is laminar, the pressure behind the object is higher than the surrounding fluid. The shape of an object determines how strong the effect is. In general, the more aerodynamic an object is, the smaller and weaker its slipstream will be. For example, a box-like front (relative to the object's motion) will collide with the medium's particles at a high rate, transferring more momentum from the object to the fluid than a more aerodynamic object. A bullet-like profile will cause less turbulence and create a more laminar flow. A tapered rear will permit the particles of the medium to rejoin more easily and quickly than a truncated rear. This reduces lower-pressure effect in the slipstream, but also increases skin friction (in engineering designs, these effects must be balanced). The term "slipstreaming" describes an object traveling inside the slipstream of another object (most often objects moving through the air though not necessarily flying). If an object is inside the slipstream behind another object, moving at the same speed, the rear object will require less power to maintain its speed than if it were moving independently. In addition, the leading object will be able to move faster than it could independently, because the rear object reduces the effect of the low-pressure region on the leading object. ==Drafting== Slipstreaming, also known as drafting is important in a number of contexts, including: *In fast bicycle races, competitors attempt to use one another's slipstream, or "draft", breaking out to overtake the leader only at the last possible moment. In recreational cycling, on the other hand, members of a group can take turns at the leading position, enabling one another to rest a little. In a group of cooperative cyclists with sufficient group-riding skill, stronger members can spend more time leading to give weaker riders more rest, enabling riders of different strengths to ride together, at least on relatively flat routes. On inclines, however, the benefit of drafting is relatively less, as speeds are slower and the cyclist's primary effort is working against gravity. The flat or hilly nature of a route has consequences for both racing and recreational cycling, with different types of routes favouring different types of cyclists. *Following in the slipstream of another motor vehicle, or "drafting", allows for significantly improved fuel efficiency due to reduced atmospheric drag. Truck convoys are a common example, travelling highways in a single-file queue several vehicles long. In tests, this has been shown to produce significant fuel savings.〔(Konvoi - Development and examination of the application of electronically coupled truck convoys on highways Aachen University study 2012 )〕 Auto racing drivers also draft in order to conserve fuel, the better to gain competitive advantage by reducing the frequency of fuel stops or, more often, to reach a higher speed before pulling out to attempt to overtake another driver. *A related effect used for lift rather than drag reduction is vortex surfing for airborne objects. The extended formations (V formation) or "skeins" in which many migratory birds (especially geese) fly enable the birds (except, of course, the bird at the front) to use vortex surfing to take advantage of one another's vortices.〔(Drag Reduction from Formation Flight. Flying Aircraft in Bird-Like Formations Could Significantly Increase Range ); Defense Technical Information Center; April 2002; Retrieved February 27, 2008〕 Other birds (for example cormorants) that typically fly in close formation, even on short journeys, are probably also exploiting this effect. Using wingtip vortices has been tested for aircraft, and could save 10%-29% fuel.〔(NASA SKY SURFING FOR FUEL ECONOMY )〕〔Cooney, Michael (October 11, 12). ("Air Force lab tests out "aircraft surfing" technique to save fuel" ). Network World.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Slipstream」の詳細全文を読む スポンサード リンク
|