卫星推进剂技术发展趋势概述

概述了用于卫星的多种推进剂技术,包括传统的常规化学推进剂技术,以及新近应用的"绿色"化学推进剂技术、胶体推进剂技术和在电推进、微推进中使用的推进剂技术等。指出卫星用推进剂正呈现出低成本、无毒化、高能量的发展趋势。

运载火箭液氢液氧低温推进剂加注技术策略探讨

应用液氢、液氧等低温推进剂的运载火箭中,低温推进剂的加注方案是尤为关键的内容,低温推进制备以及加注技术直接影响了发动机预冷、过热层不可用量以及贮箱的增压压力需求等相关内容。低于液氧温度的液氧深度过冷技术是满足单级入轨以及可重复应用运载火箭需求的重要技术手段。通过分析可以发现。深度过冷加注可以有效的降低增压系统的整体规模,有效减小贮箱的容积,具有提高发动机预冷适应性,提高整体品质,增强发射是影响,缩短加注发射流程的优势。因此,文章主要对运载火箭液氢液氧低温推进剂加注技术策略进行了简单的探讨分析。

基于时间序列相关处理的三维超声成像检测方法

针对固体火箭发动机药柱缺陷的检测要求,提出了一种利用超声波透射原理的数字成像检测方法,该方法不仅可以解决用单探头反射法无法解决的穿透问题,而且可以解决传统的双探头透射法不能解决的缺陷定位问题,经原理性实验验证,该方法切实可行.

HYBRID APPROACH FOR ESTIMATING COUPLING EFFECT BETWEEN PROPELLANT SLOSHING DYNAMIC AND SPACECRAFT GNC

An approach based on equivalent mechanics theory and computational fluid dynamics （CFD） technology is proposed to estimate dynamical influence of propellant sloshing on the spacecraft. A mechanical model is estab- lished by using CFD technique and packed as a ＂sloshing＂ block used in spacecraft guidance navigation and control （GNC） simulation loop. The block takes motion characteristics of the spacecraft as inputs and outputs of pertur- bative force and torques induced by propellant sloshing, thus it is more convenient for analyzing coupling effect between propellant sloshing dynamic and spacecraft GNC than using CFD packages. An example demonstrates the accuracy and the superiority of the approach. Then, the deducing process is applied to practical cases, and simulation results validate that the proposed approach is efficient for identifying the problems induced by sloshing and evaluating effectiveness of several typical designs of sloshing suppression.