摘要
降落伞的弹射拉直是其工作的第一个也是至关重要的一个环节。航天器在超声速状态下的尾流性质也非常复杂,因此,如何考虑前体航天器尾流对降落伞弹射拉直过程的影响是一个值得研究的问题。文章首先采用CFD方法计算出航天器的超声速尾流数据,然后建立降落伞弹射拉直过程的动力学模型。由于降落伞的拉直过程持续时间很短,故在研究过程中将连续尾流离散化为不同时刻的尾流,仅考虑尾流气动力对降落伞弹射拉直过程的影响。具体方法是将弹射拉直时刻计算的航天器尾流区速度场叠加于弹射分离降落伞伞包的空速上,计算考虑航天器尾流影响的伞包气动力,然后通过动力学仿真研究航天器尾流对降落伞弹射拉直过程的影响,重点研究了对伞包运动稳定性的影响。利用该方法对典型工况超声速尾流影响下的降落伞弹射分离过程进行了动力学分析,重点分析了尾流对伞包的运动轨迹和姿态的影响,研究方法和结论对稳定伞弹射拉直过程的验证评估具有重要的参考价值。
The ejecting and deploying process is the first and important phase of a parachute, and the wake flow of the spacecraft in supersonic speed is also complicated, So how to consider wake effects of spacecraft is a problem worth researching. This paper computes supersonic wake data of spacecraft using CFD methods firstly, then builds a dynamic model of ejecting and deploying process of a parachute. The continuous wake can be discreted by times because the deploying process lasts short, and just the aerodynamic force effect on the wake flow is considered. The detailed method is as follows, when calculating the aerodynamic force of parachute bag, take the wake velocity of spacecraft additive to the velocity of parachute bag, then analyze the dynamic character of ejecting and deploying process through numerical simulation, especially the motion stability of the parachute bag. This paper researches on ejecting and deploying process of parachute considering supersonic wake of spacecraft under typical conditions, especially analyzes the trajectory of motion and attitude of the parachute bag. The analysis method and conclusion can provide important reference value for validation and evaluation of ejecting and deploying process of parachute.
出处
《航天返回与遥感》
CSCD
北大核心
2017年第5期3-9,共7页
Spacecraft Recovery & Remote Sensing
基金
国家重大科技专项工程
关键词
尾流影响
弹射拉直
降落伞
航天器回收
wake flow effects
ejecting and deploying
parachute
spacecraft recovery
