Modeling and Analysis of a LOX/Ethanol Liquid Rocket Engine

ABSTRACT This work studies the performance and dry mass of the under development LOX/Ethanol L75 liquid rocket engine. To this end, an object-oriented program written in C++ was developed. The program is intended to be versatile and easily extensible in order to analyze different configurations of liquid rocket engines. The UML (Unified Modeling Language) tool is used to model the architecture of the codes. UML diagrams help to visualize the code structure and the communication between objects, enabling a high degree of abstraction. The cryogenics Vulcain and HM7B engines power cycles along with the staged-combustion SSME engine perform the verification of the codes. Finally, the influence of changes in design parameters on the performance and dry mass of the L75 rocket engine is analyzed.

摘要 本研究针对正在研发中的液氧/乙醇（LOX/Ethanol）L75液体火箭发动机的性能与干质量展开研究。为此，开发了一款基于C++编写的面向对象程序。该程序兼具通用性与易扩展性，可用于分析不同构型的液体火箭发动机。本研究采用统一建模语言（UML，Unified Modeling Language）工具对程序代码的架构进行建模，UML图能够直观呈现代码结构与对象间的交互关系，实现高度抽象化建模。本研究选用低温火神（Vulcain）、HM7B发动机的动力循环方案，以及分级燃烧式航天主发动机（SSME，Space Shuttle Main Engine）对所开发的程序进行验证。最后，分析了设计参数变更对L75火箭发动机性能与干质量的影响。