The Study For Aeroelasticity Of Supersonic Inflatable Aerodynamic Decelerator

Inflatableaerodynamic decelerator(IAD)represents a new suite ofdecelerator technologies that can provide a sizeableincrease in landed mass, with the characteristics of large resistance and effective load, to meet the quality of the detector from the high Maher number quickly slowed down and landed safely. The research shows that the pneumatic reducer can improve the effective load of about 80% compared with the disc-seam belt bevel reducer. In addition, Inflatableaerodynamic decelerator should be reduced as much as possible the design requirements of thermal protection system. Spacecraft at a supersonic speed through the atmosphere of Mars, reentry, deceleration and landing process, to take a drastic aerodynamic heating, which requires the reducer can protect the return load so as not to be violent gas heating burned, reduce burden of spacecraft thermal protection system design. Thus, it is necessary to study the aerodynamic characteristics(especially the drag force characteristic) of pneumatic reducer. An aerodynamic numerical study of a rigid tension cone(RTC) IAD wasconducted usingthe CFX software in this paper.Aerodynamic parameters of the RTC in different workings are calculated. The examination of the results against the wind tunnel test data made it possible toshow the accuracy of all methodologies used in this study.The main results are as follows:(1) by comparing the results of the numerical results with a wind tunnel test to prove that the numerical method can effectively obtain rigid tension conical inflatable aerodynamic deceleration device of gas dynamic performance parameters, for example: drag, lift and pitching moment parameters.(2) the drag coefficient of the short-base model at different Maher number and the landing at different attack angles is analyzed, and the drag coefficient decreases with the increase of the Maher number under the supersonic velocity. This result is in line with the law of resistance characteristics.(3) with the increase of the attack angle, the difference of the drag coefficient between the different Maher numbers at a certain angle of attack is increasing.(4) through the comparison of three groups of model with the same initial conditions drag coefficient(to be inserted). It was found that no-base model RTC structure resistance coefficient is higher than the short-base and long-base model of the corresponding resistance coefficient. Therefore, it can be deduced that the instrument cabin can influence the aerodynamic characteristics of the rigid tension conical IAD.