全流量补燃循环发动机系统参数模型与设计(Ⅰ)动力平衡特性
Parametric model and design of full flow staged combustion cycle engine system for (Ⅰ) engine balance characteristics
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摘要: 为了深入理解全流量补燃循环发动机系统的特点,建立了全流量补燃循环发动机系统动力平衡模型,补充了压力平衡方程,研究了预燃室混合比对发动机系统参数的影响规律.研究结果表明:①富燃、富氧预燃室的混合比是相互匹配的,随着富燃预燃室混合比增大,富氧预燃室混合比减小,混合比组合的规律是保持富燃、富氧预燃室燃气做功能力的平衡;②随着富燃预燃室混合比增大,预燃室燃气温度升高,富燃预燃室燃气流量增大(富氧预燃室燃气流量减小),燃气做功能力增强,燃料泵(氧化剂泵)的扬程降低;③预燃室混合比直接决定了预燃室燃气温度,影响了预燃室燃气物性参数,参与了发动机系统的流量分配,控制了系统燃气做功能力,最终影响了泵的扬程.
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关键词:
- 全流量补燃循环发动机 /
- 动力平衡 /
- 预燃室混合比 /
- 燃气做功 /
- 泵扬程
Abstract: The full flow staged combustion (FFSC) cycle engine balance model was established and the pressure relationship between the fuel-rich flow and the oxygen-rich flow was added in this model.These results show that (1) mixture ratios of preburners are matched for each other,mixture ratio of ox-rich preburner decreases with increasing mixture ratio of fuel-rich preburner,helping to balance the work of two side preburner gases;(2) with the increase of mixture ratio of fuel-rich preburner,the preburner gas temperature is enhanced,the fuel-rich preburner gas mass flowrate is enlarged (the ox-rich preburner gas mass flowrate reduced),the working ability of preburner gas is reinforced,and the fuel pump lift falls down(the oxidizer pump lift ascends);(3) the mixture ratio of preburner determines the preburner gas temperature,influences the preburner gas properties,participates in the mass flow distribution,controls the working ability of preburner gas,and then affects the pump lift. -
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