全流量补燃循环发动机系统参数模型与设计(Ⅱ)参数设计
Parametric model and design of full flow staged combustion cycle engine system for (Ⅱ) parameterization design
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摘要: 在全流量补燃循环发动机系统动力平衡模型的基础上,研究了氢发汗冷却流量、燃烧室压力和燃烧室混合比对发动机系统参数的影响规律.研究结果表明:在发动机推力和喷管扩张比保持恒定时,①随着氢发汗冷却流量的增加,燃料泵扬程大幅度增大,氧化剂泵扬程小幅度减小;②当燃烧室压力在20MPa之前,泵的扬程增加与燃烧室压力的增加近似成线性;而在20MPa之后,燃烧室压力的增加很小,导致泵的扬程增加很大,燃烧室压力不宜超过20MPa;③随着燃烧室混合比的增加,燃料泵扬程呈线性增大,氧化剂泵扬程开始以较大幅度减小,之后以小幅度减小;因此燃烧室混合比不宜过小,取7左右较为合适.这些研究结果为全流量补燃循环发动机系统参数设计提供了合理的选择范围.
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关键词:
- 全流量补燃循环发动机 /
- 系统参数设计 /
- 氢发汗冷却流量 /
- 燃烧室压力 /
- 燃烧室混合比
Abstract: Based on the full flow staged combustion (FFSC) cycle engine balance model,three parameters were selected for the engine system design,such as hydrogen transpiration cooling mass flow rate,combustion chamber pressure and combustion chamber mixture ratio.These results show that,when the thrust and nozzle expansion ratio are kept constant:(1) with the increase of hydrogen transpiration cooling mass flow rate,the fuel pump lift ascends rapidly and the oxidizer pump lift falls down;(2) with the increase of combusion chamber pressure,the pump lift ascends linearly before combustion chamber pressure at 20MPa and rapidly after 20MPa,so 20MPa is recommended for combustion chamber pressure;(3) with the increase of combustion chamber mixture ratio,the fuel pump lift ascends linearly,the oxidizer pump lift reduces rapidly and then slowly,so seven is recommended for combustion chamber mixture ratio.The effects of these design parameters on engine system parameters offer a reasonable range for engine system design. -
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