脉冲爆震发动机两相流喷射混合过程数值模拟

Numerical Simulation of Injection and Mixing on Two-phase for Pulse Detonation Engine

脉冲爆震发动机具有众多优点,近来受到广泛的关注。要成功起始爆震首先要解决燃油、空气的喷射与混合问题。利用CFD商用软件FLUENT分别对切向、轴向和径向液态汽油喷射方式的爆震室中油、气的混合特性进行了三维数值模拟,结果显示:轴向喷射时,燃油空间分布不均匀,油气的混合均匀性也不够;径向喷射时,油气的混合不如切向喷射时充分,油气的分布也不如其它两种方式均匀;切向喷射时,空间分布比较均匀,油气混合性也较好。

Pulse detonation engine has received much attention of late because of its several advantages compared to existent engines. The fuel-air injection and mixing is one of the most important research issues. The mixing processes for fuel injected through axial inlet, radial inlet and tangential inlet were addressed. The mixing characteristic inside a mixing chamber was obtained from three-dimensional simulation. The simulation indicates that not-well mixing and uneven concentration distribution occurs when air is introduced through the radial inlet, but well-proportioned distribution and well mixing occurs when air is introduced through the tangential inlet. The mixing degree and gasoline-air distribution when air is introduced through the axial inlet are between that of tangential inlet and radial inlet.