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论文作者:英语论文论文属性:硕士毕业论文 dissertation登出时间:2012-04-09编辑:lena ding点击率:5729
论文字数:1923论文编号:org201204091055595156语种:英语 English地区:中国价格:免费论文
关键词:Pressurization systemNumerical calculationDynamic modelLagrange coordinates
摘要:本论文通过对国内外同行管路系统研究成果的分析,以及对管路系统气体瞬变填充过程建模方法和气体动力学数值计算方法的深入研究和比较,以拉格朗日坐标下的一维非定常气体动力学方程组为基础,针对运载火箭一个典型增压气路系统及其系统组件,建立了典型气路系统高压氦气高速瞬变填充管路的流动过程的数学模型。并利用本论文的模型,采用完全守恒型差分格式的数值计算方法,用FORTRAN计算机语言编制了数值计算程序对该管路系统的非定常气动过程进行了数值计算,对不同算例的计算结果进行了分析和比较。
Pressurization system is very important in a flight vehicle propulsion system. Using the normal temperature gaseous helium to pressurize is one of the important means in propellant tank pressurization system of liquid propellant rocket engine. The regular operation of pressurization system ensures propellant supplying steadily and the engine operating normally. But in the fast and transient priming process of high-pressure gaseous helium, the unsteady gas flow is likely to cause unsteady pressue, consequently brings on violent vibrations of the whole gas pipeline system, which can seriously destroy the structure of the system and make the pressurization system invalid. Therefore the study on the transient priming process of high-pressure gaseous helium in pressurizing gas pipeline system of a launch vehicle is significant.
1 Pressure MPa 23
2 Temperature K 288.15
1.2 Research Status
Pressurization system is very important in a flight vehicle propulsion system. Using the normal temperature gaseous helium to pressurize is one of the important means in propellant tank pressurization system of liquid propellant rocket engine.
1.2.1 Oscillation
Pressurization system is very important in a flight vehicle propulsion system. Using the normal temperature gaseous helium to pressurize is one of the important means in propellant tank pressurization system of liquid propellant rocket engine.
1.2.2 Dynamic characteristics
Pressurization system is very important in a flight vehicle propulsion system. Using the normal temperature gaseous helium to pressurize is one of the important means in propellant tank pressurization system of liquid propellant rocket engine.
1.3 Dissertation’s Structure
2 Basic Theory
3 Mathematical Model
4 Program
5 Examples and Results
Conclusion
The calculated results show that the mathematical model and numerial calculation methods established in this thesis preferably described the fast and transient dynamic process of this system and provide a theoretical basis to analyze dynamic characteristics of the components such as pipelines and pressure reductor of pressurization gas pipeline system of a launch vehicle. These work makes a foundation for further studies on vibration of pressurization gas pipeline system and other relevant problems.
References
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[2] Cai Yigang. Fluid Pipeline Dynamics[M]. Zhejiang: Zhengjiang University Press, 1990
[3] LZHANG, ASTIJSSELING,AEVARDY. FSI Analysis of Lquid-filled Pipes[J]. Journal of Sound and Vibration,1999,224(1): 69-99
[4] Ryuichi Sekita, Minoru Matsuda, Ryou Nakamura.Pressure Oscillation Analysis of the Pressure Regulator for the H-IIA Propulsion System [R].AIAA,2003-4600
[5] Mao Xia, et al. Analysis of Affective Characteristics and Evaluation of Harmonious Feeling of Image Based on 1/f Fluctuation Theory[A].https://www.51lunwen.org/cm/2012/0409/1055595156.html International Conference on Industrial & Engineering Applications of Artificial Intelligence &本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。