Numerical simulation of dynamic derivatives for air-breathing hypersonic vehicle

Liu Xu; Liu Wei; Zhou Yunlong; Chai Zhenxia

doi:10.7638/kqdlxxb-2015.0020

ACTA AERODYNAMICA SINICA > 2015 > 33(2): 147-155. > DOI: 10.7638/kqdlxxb-2015.0020

Liu Xu, Liu Wei, Zhou Yunlong, Chai Zhenxia. Numerical simulation of dynamic derivatives for air-breathing hypersonic vehicle[J]. ACTA AERODYNAMICA SINICA, 2015, 33(2): 147-155. DOI: 10.7638/kqdlxxb-2015.0020

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Numerical simulation of dynamic derivatives for air-breathing hypersonic vehicle

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

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Received Date: January 01, 2015
Revised Date: March 12, 2015
Available Online: January 07, 2021

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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 derivative 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 hypersonic vehicle at large angles of attack according to this WR-A large-amplitude vibration simulation.
- air-breathing hypersonic vehicle,
- dynamic derivative,
- forced vibration,
- numerical simulation,
- N-S equation

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