当前位置:
X-MOL 学术
›
J. Therm. Anal. Calorim.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Numerical investigation of flame propagation in pulse detonation engine with variation of obstacle clearance
Journal of Thermal Analysis and Calorimetry ( IF 4.4 ) Pub Date : 2019-11-04 , DOI: 10.1007/s10973-019-08948-5 Noor Alam , K. K. Sharma , K. M. Pandey
Journal of Thermal Analysis and Calorimetry ( IF 4.4 ) Pub Date : 2019-11-04 , DOI: 10.1007/s10973-019-08948-5 Noor Alam , K. K. Sharma , K. M. Pandey
The objective of present research work is to investigate the combustion flame acceleration and performance of pulse detonation engine (PDE). The PDE tube consisting of obstacles of varying gap with fixed blockage ratio is analyzed in the current study. The three-dimensional reactive Navier–Stokes equation along with realizable k–ε turbulence model is used to simulate the combustion phenomena of hydrogen–air mixture. The one-step irreversible chemical kinetics model analyzes detailed mechanism of exothermic reaction. The propagation of flame and deflagration-to-detonation transition (DDT) run-up length is based on normal propagating regime. As the gap between combustor inner surface and obstacle outer diameter increases, the propagating area near the combustor axis reduces. Therefore, loss of momentum of turbulence combustion particle and unburnt fuel particles (voids) are increased at the wake of obstacle due to the increase in gap (or reduction in obstacle outer diameter), which results reduction in detonation wave velocity and detonation total pressure. However, DDT flame run-up length increases with lower temperature along the axis of PDE combustor. The thrust force generated by PDE combustor also gets reduced as the obstacle diameter is reduced.
中文翻译:
障碍物间隙变化下脉冲爆震发动机火焰传播的数值研究
目前研究工作的目的是研究燃烧火焰的加速和脉冲爆震发动机(PDE)的性能。在本研究中分析了由固定间隙比不同的间隙障碍物组成的PDE管。可变现沿三维反应Navier-Stokes方程ķ - ε湍流模型用于模拟氢-空气混合物的燃烧现象。一步不可逆的化学动力学模型分析了放热反应的详细机理。火焰的传播和爆燃-引爆过渡(DDT)的上升长度基于正常的传播方式。随着燃烧器内表面和障碍物外径之间的间隙增加,燃烧器轴线附近的传播面积减小。因此,由于间隙的增加(或障碍物外径的减小),在障碍物的尾流处湍流燃烧颗粒和未燃烧的燃料颗粒(空隙)的动量损失增加,导致爆炸波速度和爆炸总压的减小。但是,随着温度的降低,DDT火焰的上升长度沿PDE燃烧器的轴线增加。
更新日期:2019-11-04
中文翻译:
障碍物间隙变化下脉冲爆震发动机火焰传播的数值研究
目前研究工作的目的是研究燃烧火焰的加速和脉冲爆震发动机(PDE)的性能。在本研究中分析了由固定间隙比不同的间隙障碍物组成的PDE管。可变现沿三维反应Navier-Stokes方程ķ - ε湍流模型用于模拟氢-空气混合物的燃烧现象。一步不可逆的化学动力学模型分析了放热反应的详细机理。火焰的传播和爆燃-引爆过渡(DDT)的上升长度基于正常的传播方式。随着燃烧器内表面和障碍物外径之间的间隙增加,燃烧器轴线附近的传播面积减小。因此,由于间隙的增加(或障碍物外径的减小),在障碍物的尾流处湍流燃烧颗粒和未燃烧的燃料颗粒(空隙)的动量损失增加,导致爆炸波速度和爆炸总压的减小。但是,随着温度的降低,DDT火焰的上升长度沿PDE燃烧器的轴线增加。