空气动力学学报Issue(2)：147-155,9.DOI:10.7638/kqdlxxb-2015.0020
吸气式内外流一体化飞行器动导数数值模拟
Numerical simulation of dynamic derivatives for air-breathing hypersonic vehicle
摘要
Abstract
Dynamic derivatives are important parameters for designing aircraft trajectory and attitude control system,and for deciding the divergence behavior of vibration under disturbance. After calibration model validation,the dynamic behavior of an air—breathing hypersonic vehicle, namely WR—A (Wave Rider)is characterized.The unsteady flow field around the under aircraft forced simple harmonic vibration (SHV)condition is simulated using Navier Stokes equation. The direct damping derivatives,acceleration derivatives and rotary derivatives of this air—breathing hypersonic vehicle are obtained.The air inlet performance parameter derivatives are solved using Etkin predictive aerodynamic model.The air inlet performance parameters under large—amplitude vibration are successfully predicted using the dynamic derivative model.This offers a guideline for characterizing the dynamic unsteady internal flow field and predicting air inlet performance variation.The proportion of acceleration derivative,which represents the flow time lag effect,in the direct damping derivative can be as high as forty percent but is opposite to the damping deriv—ative direction in some cases,contributing to dynamic instability adversely.It is reasonable to using this dynamic derivative model to express the aerodynamic behavior of air—breathing hyper—sonic vehicle at large angles of attack according to this WR—A large—amplitude vibration simula—tion.关键词
吸气式高超声速飞行器/动导数/强迫振动/数值模拟/N-S 方程Key words
air-breathing hypersonic vehicle/dynamic derivative/forced vibration/numerical simulation/N-S equation分类
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刘绪,刘伟,周云龙,柴振霞..吸气式内外流一体化飞行器动导数数值模拟[J].空气动力学学报,2015,(2):147-155,9.基金项目
国家自然科学基金 （）
