关键词: 可压缩涡对, 喷流, 欧拉方程, 超单速横流

Abstract:

A numerical method to simulate the single gaseous jet injected normally into a uniform supersonic crossflow is presented. The jet cross section is modeled in terms of a compressible vortex pair, which results from viscous and impulse forces at the periphery of the jet. The behavior of the vortex pair is then combined with mass and momentum balance along the axis of the jet to form a model, which describes the trajectory and mixing of the injected fluid. Due to the complication associated with a supersonic crossflow, a numerical technique is used to solve the inviscid outer flow and the position of the bow shock that envelops the jet. This solution, combined with the compressible vortex pair associated with the jet, allows prediction of trajectory of these types of gaseous jet. In fact, experimental data are used for comparison with the computed results, which shows that the present model is able to predict the overall jet penetration.

Key words: vor tex pair, jet, Euler equation, super sonic cr ossflow