Study on bias residual control of high mixture ratio bi-propellant

高混合比双组元推进剂剩余量偏置控制研究

¹ Unmanned System Research Institute, Northwestern Polytechnical University, Xi'an 710072, China
² Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China
³ China Academy of Launch Vehicle Technology, Beijing 100076, China
⁴ School of Civil Aviation, Northwestern Polytechnical University, Xi'an 710072, China

Received: 29 July 2022

Abstract

Lift capacity is the key performance of the launch vehicle, and high chemical energy bi-propellants are commonly used for the modern large liquid rockets. The residual unburned propellant has a strong effect on the lift capacity and the lift efficiency, especially for the orbital stages. In this paper, the bias residual control of high mixture ratio propellant is studied, three models, including equal-probability depletion model (EPDM), equal-mass residual model(EMRM) and optimum residual model(ORM) are analyzed. Comparing with the traditional equal-probability depletion, the bias residual control of bi-propellants, especially for LOX and LH2, is benefit to the lift capacity. The effect between EMRM and ORM on the residual unburned propellant is negligible, and the EMRM is preferred in engineering.

摘要

运载能力是火箭的核心性能指标, 大型液体运载火箭大都采用高性能的双组元推进剂, 推进剂的使用及剩余量控制对运载能力和运载效率影响很大, 特别是入轨级。针对目前火箭常用的高性能双组元推进剂, 利用系统对推进剂混合比偏差的调节能力, 研究了3种控制模型(等概率耗尽模型、等质量剩余模型、最优剩余模型)及其对运载能力的影响。根据理论分析、模拟打靶及飞行数据对比, 发现相较传统的氧燃推进剂等比例剩余控制策略, 对于高混合比的氢氧推进剂, 氧化剂和燃烧剂在非等比例剩余的情况下能够减少推进剂剩余量, 提升运载能力, 等质量剩余和最优剩余差别较小, 在工程上可以采用更简单的等质量剩余控制推进剂剩余量。