Research on transient evolvement and modeling method of cavity with rotating orifices
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摘要:
旋转孔与腔组成的孔腔系统为航空发动机空气系统的重要组成部分，其瞬态响应过程可能诱发短时危险过渡态载荷。为研究旋转孔腔的瞬态演化规律，以旋转孔前的容腔为研究重点，建立了带旋转孔的容腔CFD计算模型，分析了孔腔系统的瞬态演化过程，并基于旋转孔的稳态流动特性建立了带旋转孔容腔的瞬态1-D模型，对瞬态演化过程进行了仿真。通过对比瞬态1-D模型的结果和CFD结果，发现采用前者能基本模拟容腔的瞬态演化过程，基本满足工程需要，并完成了瞬态1-D模型结果产生偏差的原因分析。
Abstract:Rotating orifices and cavity are important parts of the air system of gas turbine engine, and their transient response might induce dangerous instantaneous transient load. To investigate the transient evolvement of the cavity with rotating orifices, a CFD model of the cavity with rotating orifices was built to research the cavity in front of the rotating orifices. Based on the steady flow characteristic of the rotating orifices, a transient one-dimensional model was built to simulate the transient process. The comparison of the results between the one-dimensional model and the CFD model shows that the former can conduct the transient process simulation satisfactorily and satisfy the elementary engineering needs. Finally, the analysis of the reason for the result errors of one-dimensional model is presented in this paper.
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图 5 稳态工况流量系数结果与拟合
Figure 5. Discharge coefficient results and fitting under steady working condition
图 6 瞬态工况压比随时间变化
Figure 6. Change of pressure ratio with time under transient working condition
图 7 瞬态工况腔内平均总压结果
Figure 7. Average total pressure results in cavity under transient working condition
图 10 瞬态工况腔内平均总温结果
Figure 10. Average total temperature results in cavity under transient working condition
图 11 稳态工况下腔内总温分布云图
Figure 11. Distribution contour of total temperature in cavity under steady working condition
图 12 瞬态与稳态工况下流量系数对比
Figure 12. Comparison of discharge coefficient under transient and steady working conditions
图 13 稳态工况下腔内角速度云图
Figure 13. Contour of angular velocity in cavity under steady working condition
图 14 斜坡工况下腔内角速度演化过程
Figure 14. Evolvement of angular velocity in cavity under slope working condition
图 15 斜坡工况下0.007 s时刻腔内径向速度云图
Figure 15. Contour of radial velocity in cavity at 0.007 s under slope working condition
图 16 斜坡工况下孔前截面角速度演化
Figure 16. Evolvement of angular velocity in cross section in front of orifice under slope working condition
图 17 斜坡工况下腔内总温分布云图
Figure 17. Distribution contour of total temperature in cavity under slope working condition
图 18 斜坡工况下腔内总温与孔进口总温对比
Figure 18. Comparison of total temperature between cavity and inlet of orifice under slope working condition
图 19 光滑工况下进出口流量误差变化
Figure 19. Variation of inlet and outlet flow rate errors under smooth working condition
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