Numerical simulation of oblique detonation engine performance based on kerosene fuel
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摘要:
针对马赫数为8以上高超声速飞行器的应用问题,采用11组分-10反应步的煤油/空气化学反应动力学模型,对不同来流及燃料喷注条件下的斜爆轰模型发动机进行数值研究,获得其对燃烧室内起爆驻定、爆轰波波面结构及推进性能的影响规律。研究结果表明:燃烧室入口马赫数为4.3时,超声速来流与壁面边界层作用加速了点火起爆过程,爆轰波在短时间内驻定。随着来流速度增大,爆轰波驻定位置更靠近燃烧室下游,爆轰波与边界层相互作用产生分离泡导致斜爆轰发动机推力显著降低。燃料当量比的变化直接影响爆轰波波面结构,减小当量比使得斜爆轰波稳定性降低,光滑的波面转变为“锯齿”状结构,具有该结构的爆轰波流场会显著降低发动机推进性能。
Abstract:According to the application problem of hypersonic vehicles above Mach number of 8, the 11 component/10-reaction steps kerosene chemical reaction kinetics model was adopted to perform numerical simulations about the two-dimensional model of oblique detonation engines under different inlet and fuel injection conditions. The effect of incoming Mach number on initiation and stabilization of detonation waves in the combustor, and the effect of fuel equivalent ratio on detonation wave surface structures, and the engine propulsion performance were obtained. The results showed that the effect of the supersonic flow and the wall boundary layer accelerated the detonation initiation process, and the detonation wave stabilization was completed shortly when the inlet Mach number of the combustor was 4.3. Continuing to increase the incoming Mach number made the stabilization position of the detonation wave closer to the downstream. The separation bubble generated by the interaction of the detonation wave and the boundary layer caused the thrust of the oblique detonation engine to be significantly reduced. The fuel equivalent ratio directly affected the detonation wave surface structure. Reducing the equivalence ratio reduced the stabilization of the oblique detonation wave, and the smooth wave surface was transformed into a sawtooth structure. The detonation wave flow field with this structure could significantly reduce its propulsion performance.
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Key words:
- oblique detonation engine /
- kerosene /
- detonation wave /
- initiation /
- supersonic combustor
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表 1 煤油11组分10步化学反应机理
Table 1. Rate constants for 11 species 10-step chemical kinetics of kerosene
反应式 A/(1/s) B E/(J/kmol) ${ {\text{C} }_{ {\text{10} } } }{ {\text{H} }_{ {\text{22} } } } + { {\text{O} }_{\text{2} } } = = {\text{10CH} } + {\text{12H} } + { {\text{O} }_{\text{2} } }$ 1.00×1012 0 3.10×104 ${\text{CH} } + { {\text{O} }_{\text{2} } }= = {\text{CO} } + {\text{OH} }$ 2.00×1015 0 3.00×103 ${\text{CH} } + {\text{O} } = = {\text{CO} } + {\text{H} }$ 3.00×1012 1.00 0 ${ {\text{H} }_{\text{2} } } + { {\text{O} }_{\text{2} } }= = { {\text{H} }_2}{\text{O} } + {\text{O} }$ 3.98×1011 1.00 4.80×104 ${ {\text{H} }_2} + {\text{O} } = = {\text{H} } + {\text{OH} }$ 3.00×1014 0 6.00×103 ${\text{H} } + { {\text{O} }_2} = = {\text{O} } + {\text{OH} }$ 4.00×1014 0 1.80×104 ${ {\text{H} }_{\text{2} } }{\text{O} } + { {\text{O} }_{\text{2} } } = = 2{\text{O} } + { {\text{H} }_{\text{2} } }{\text{O} }$ 3.17×1012 2.00 1.12×105 ${\text{CO} } + {\text{OH} } = = {\text{C} }{ {\text{O} }_{\text{2} } } + {\text{H} }$ 5.51×107 1.27 −7.58×102 $ {\text{CO}} + {{\text{H}}_{\text{2}}}{\text{O}} = {\text{C}}{{\text{O}}_{\text{2}}} + {{\text{H}}_{\text{2}}} $ 5.50×104 1.28 −1.00×103 ${\text{CO} } + { {\text{H} }_{\text{2} } } + { {\text{O} }_{\text{2} } } = = {\text{C} }{ {\text{O} }_{\text{2} } } + { {\text{H} }_{\text{2} } }{\text{O} }$ 1.60×1014 1.60 1.80×104 表 2 入口来流条件
Table 2. Inlet conditions
Case p/kPa T/K Ma φ 1 56 1021 4.3 1.35 2 56 1021 5.3 1.35 3 56 1021 6.3 1.35 4 56 1021 3.63 0.5 5 56 1021 3.63 0.6 6 56 1021 3.63 0.7 表 3 不同来流速度下发动机净推力对比
Table 3. Comparison of engine net thrust at different inflow velocities
Ma F0/N Fμ /N Fthrust/N 4.3 7606.1 −2954.4 4651.7 5.3 6597.1 −3213.4 3383.7 6.3 6579.5 −5384.3 1195.2 表 4 不同燃料当量比发动机比冲对比
Table 4. Specific impulse of engine at different equivalent ratios
φ Fthrust/N $\dot m$/(kg/s) $ {I_{{\text{sp}}}} $/(N·s/kg) 0.7 5247.74 1.932 2716.2 0.6 5163.84 1.688 3059.1 0.5 5103.51 1.394 3661.1 -
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