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Optimization of System Parameters for Liquid Rocket Engines with Gas-Generator Cycles

机译：具有气体发生器循环的液体火箭发动机系统参数的优化

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摘要

System design of liquid rocket engines must consider engine performance, weight, cost, and reliability requirements. A general design optimization framework has been developed in this paper to select the best system parameters for liquid rocket engines with gas-generator cycles. The object is to maximize the specific impulse and vacuum thrust-to-weight ratio of the engine with given system requirements and design assumptions by changing thrust-chamber pressure and mixture ratio. The system analysis, along with the engine weight estimation, is based on a modular scheme. Multidisciplinary design optimization formulations including multidisdplinary feasible and collaborative optimization are used, evaluated, and compared during the optimization process. Several techniques of multi-objective processing are also used to identify the Pareto frontier and the optimal compromise solutions. A proposed cryogenic-propellant engine using liquid oxygen and hydrogen with a gas-generator cycle is studied as a specific example. Moreover, uncertainties in the engine operation, such as thrust-chamber pressure and mixture ratio, are taken into account as random variables in the reliability-based optimization. Results are presented to illustrate the tradeoff between the engine performance and reliability requirements.
机译：液体火箭发动机的系统设计必须考虑发动机性能，重量，成本和可靠性要求。本文开发了一个通用的设计优化框架，以选择具有燃气发电机循环的液体火箭发动机的最佳系统参数。目的是通过改变推力室压力和混合比，在给定的系统要求和设计假设下，最大化发动机的比冲和真空推力重量比。系统分析以及发动机重量估算均基于模块化方案。在优化过程中，使用，评估和比较了包括多学科可行和协作优化在内的多学科设计优化公式。多目标处理的几种技术也用于识别帕累托边界和最优折衷解决方案。作为具体示例，研究了提出的使用液态氧和氢气并具有气体发生器循环的低温推进剂发动机。此外，在基于可靠性的优化中，发动机运行中的不确定性（例如推力室压力和混合比）被视为随机变量。给出结果以说明发动机性能和可靠性要求之间的权衡。

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  • 来源
    《Journal of propulsion and power》 |2010年第1期|113-119|共7页
  • 作者

    Guobiao Cai; Jie Fang; Yuntao Zheng; Xiaoyan Tong; Jun Chen; Jue Wang;

  • 作者单位

    Beijing University of Aeronautics and Astronautics, 100191 Beijing, People's Republic of China School of Astronautics;

    Beijing University of Aeronautics and Astronautics, 100191 Beijing, People's Republic of China School of Astronautics;

    Beijing University of Aeronautics and Astronautics, 100191 Beijing, People's Republic of China School of Astronautics;

    Beijing University of Aeronautics and Astronautics, 100191 Beijing, People's Republic of China School of Astronautics;

    Beijing Aerospace Propulsion Institute, 100076 Beijing, People's Republic of China;

    Beijing Aerospace Propulsion Institute, 100076 Beijing, People's Republic of China;

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