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自激振荡腔室是产生自激振荡脉冲射流的重要条件，振荡腔室的结构参数、流体流动参数、有效反馈条件及流场特性直接影响脉冲射流的瞬时冲击力。文章在理论与实验研究的基础上，采用标准的K-ε模型，应用有限元软件ANSYS进行了腔室内三维流场的数值模拟，并根据结果作出了流场速度分布图及压力与各影响因素的关系图。模拟结果与室内台架实验对比表明，数值模拟能很好的反映流场的分布及腔室压力与各影响因素之间的关系，对进一步研究有指导意义。

Numeral Simulation of Flow Field of Auto-excitation Chamber

Auto excitation chamber is the important condition to generate auto excitation pulsed jet. The configuration parameters of the chamber, the flowing parameters, effective feedback conditions and flow field features of the fluid influence the instantaneous impact force of the pulsed jet directly. Based on theoretical and practical study, using the standard K—ε model, and applying the finite element software of ANSYS, the numeral simulation of 3 D flow field in the chamber is first conducted. According to the results, the velocity distribution chart of flow field and the relationship chart between pressure and different factors have been made. Comparing the simulated results with the in house bench test, it shows the numeral simulation can well reflect the velocity distribution of flow field and the relationship between pressure and different factors, and has the guiding role for further study.