含湍流可变向微下击暴流的建模

A Variable-Orientation Model of Microburst with Turbulence

本文建立一个适合于飞行力学研究和飞行员训练的微暴流风切变模型。该模型可模拟以任意方向倾泻的微暴流，其暴核离地高度、暴核直径、暴流强度、暴流倾泻方向、距机场位置等皆为可调参数，使用灵活方便。文中还给出了一种模拟非平稳微暴流湍流的方法，使微暴流模型更趋完善。

A model of microburst is studied in this paper for flightmechanics application and real-time flight simulation training.Some mod-el available of this kind,generally,are assumed that the microburst im-pings on the ground vertically and the turbulence is unconsidered.In thispaper,a new model including some more characteristics is presented.At first four reference frames are given:airport reference frame,mic-roburst reference frame,real and image doublet sheet reference frames.Byremoving the microburst reference frame relative to airport referenceframe,we can show the fact that the aircraft penetrates wind field symmetri-cally and unsymmetrically.By changing the orientations of the doubletsheets relative to aircraft reference frame,we can simulate a tilted micro-burst.So the reality of the model and the flexibility for application areimproved.Secondary,based on time series analysis method,we research the microburst model with turbulence,which is composed of two parts.An ARIMAmodel is used here for analysis.Finally,a simulating example shows thatthe method presented above is efficient.