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| 1 | The stability analysis of rolling motion of hypersonic vehicles and its validations显示文摘The stability of the rolling motion of near space hypersonic vehicles with rudder control is studied using method of qualitative analysis of nonlinear differential equations,and the stability criteria of the deflected rolling motions are improved.The outcomes can serve as the basis for further study regarding the influence of pitching and lateral motion on the stability of rolling motion.To validate the theoretical results,numerical simulations were done for the rolling motion of two hypersonic vehicles with typical configurations.Also,wind tunnel experiments for four aircraft models with typical configurations have been done.The results show that:1)there exist two dynamic patterns of the rolling motion under statically stable condition.The first one is point attractor,for which the motion of aircraft returns to the original state.The second is periodic attractor,for which the aircraft rolls periodically.2)Under statically unstable condition,there exist three dynamic patterns of rolling motion,namely,the point attractor,periodic attractor around deflected state of rolling motion,and double periodic attractors or chaotic attractors. | YE YouDa ZHAO ZhongLiang TIAN Hao ZHANG XianFeng | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，12： | 8 |
| 2 | The stability of rolling motion of hypersonic vehicles with slender configuration under pitching maneuvering显示文摘The configurations of near space hypersonic flying vehicles are considerably different from those of conventional aircrafts.Their configurations are relatively slender;hence their moment of inertia around the longitudinal axis is much smaller than those around the other two axes,resulting in strong coupling of rotations around the three axes.Thus,the stability analysis of rolling motion for such flying vehicles is more complicated than those for conventional aircrafts,and there is no available result of stability analysis which can readily be applied to such cases.This paper is mainly concerned with the stated problem.Considering the practical situation,our investigation is targeted a slightly simpler problem,namely the rolling stability of flying vehicle under known pitching motion.The stability criterion of rolling motion is obtained with and without lateral motions.We also conducted numerical simulation for the pitching-rolling coupled motions of flying vehicles by solving Navier-Stokes equations coupled with dynamic equations of flight.The results of simulation agree well with those of theoretical analysis and experiments. | YE YouDa TIAN Hao ZHANG XiaFeng | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，6： | 4 |
| 3 | How does the rarefaction of the air affect hypersonic vehicles显示文摘The scope,physical concept,and mathematical model for describing how the rarefaction of the air affects on hypersonic flows have been discussed.A new method,namely the data improved Naive-Stroke(DiNS)model,was proposed for the computation of hypersonic shear flows around vehicles flying at altitude of 30-100 km.Validation of the new continuum method has also been done. | Youda Ye | 2021 | Acta Mechanica Sinica2021，37，1： | 1 |
| 4 | Numerical Application of the Flamelet Model to Supersonic Turbulent Combustion显示文摘In this study,the flow field structure inside a scramjet combustor is numerically simulated using the flamelet/progress variable model.Slope injection is considered,with fuel mixing enhanced by means of a streamwise vortex.The flow field structure and combustion characteristics are analyzed under different conditions.Attention is also paid to the identification of the mechanisms that keep combustion stable and support enhanced mixing.The overall performances of the combustion chamber are discussed. | Yongkang Zheng Qinxue Jiang Hao Tian Youda Ye Jingying Wang | 2022 | Fluid Dynamics & Materials Processing2022，18，4： | 0 |
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