Research on the operating boundary of the dual mode scramjet with a constant area combustor through thermodynamic cycle analysis

Research on the operating boundary of the dual mode scramjet with a constant area combustor through thermodynamic cycle analysis
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基于热力循环分析的定面积燃烧室双模式超燃冲压发动机运行边界研究

DOI:
10.1016/j.energy.2020.119271
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发表时间:
2020-11
期刊:
影响因子:
9
通讯作者:
Wen Bao
Wen Bao
中科院分区:
工程技术1区
文献类型:
--
作者:
Youyin Wang;Wenxin Hou;Junlong Zhang;Jingfeng Tang;Juntao Chang;Wen Bao

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隔离段的最大压比是研究双模态超燃冲压发动机工作边界的重要参数。分析了双模态超燃冲压发动机的增压机理和隔离段最大增压特性。采用等截面燃烧室研究了超燃冲压发动机在压力上升极限下的工作范围和性能。隔离段的最大压比限制了来自燃烧室的背压,使得超燃冲压发动机在每个当量比下都具有最小的自由飞行马赫数。当自由飞行马赫数小于最小自由飞行马赫数时,可以在燃烧器和隔离器之间设置膨胀段,以平衡燃烧器的压力和隔离器的压力。推导了双模态超燃冲压发动机最小自由马赫数的表达式,发现双模态超燃冲压发动机在两种模态下的最小自由马赫数均随进气道当量比和压缩比的增大而增大。提出了一种可变扩张段的设计方案,以平衡不同马赫数和当量比下的压力。
The maximum pressure ratio of the isolator is important for studying the operating boundary of the dual mode scramjet. In this paper, the pressure rise mechanism of the dual mode scramjet engine and the characteristic of the isolator maximum pressure rise are analyzed. The operating range and performance of scramjet under the pressure rise limit are investigated using the constant cross-sectional area combustor. The maximum pressure ratio of the isolator confines the back pressure from the combustor so that the scramjet engine has a minimum freestream Mach number of each equivalence ratio. When the freestream Mach number is smaller than the minimum freestream Mach number, an expansion section may be arranged between the combustor and the isolator to balance the pressure of the combustor and that of the isolator. The expression of the minimum freestream Mach number is derived and it is found that the minimum freestream Mach number of the dual mode scramjet in both modes increases with the increase of equivalence ratio and compression ratio of the inlet. A variable divergent section is suggested to balance the pressure under different freestream Mach numbers and equivalence ratios.
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