时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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Dive flaps, also called speed brakes or dive brakes, are designed to produce a minimum amount of pitch change when they extend. divergence (meteorology). A condition that exists when the distribution of winds within a given area is such that there is a net horizontal flow of air outward from the region. In divergence at lower levels, the resulting movement of air away from the surface is compensated for by subsidence of air from aloft. The air is heated and the relative humidity is lowered, making divergence a warming and drying process. Low-level divergent regions are areas in which clouds and precipitation are unlikely to form. Divergence is the opposite of convergence. divergent duct (fluid flow passage). A duct, or passage, whose cross-sectional area increases in the direction of fluid flow. When fluid flows through a divergent duct at a subsonic rate, its velocity decreases, and its pressure increases. divergent oscillation. Oscillations whose amplitude increases with time. The oscillations of an airplane that has positive static stability but negative dynamic stability are divergent oscillations. diverse vector area (air traffic control). That area, in a radar environment, in which a prescribed departure route is not the only suitable route to avoid obstacles. The area in which random radar vectors below the minimum vectoring altitude/minimum IFR altitude (MVA/MIA), established in accordance with the terminal instrument procedures (TERPS) criteria for diverse departures, obstacles and terrain avoidance, may be issued to departing aircraft. |
