非均匀进汽时迷宫密封汽流激振动力特性的研究
发布时间：2018-12-06 12:18
【摘要】：采用基于转子多频椭圆涡动模型和动网格技术的URANS方程求解方法,研究了动、静叶干涉作用以及级间补汽导致的非均匀进汽温度和压力条件下叶顶迷宫密封汽流激振转子动力特性,计算分析了进汽预旋比为0.2、0.5、0.7时叶顶迷宫密封转子动力特性系数,并与均匀进汽温度和压力条件下迷宫密封转子动力特性系数进行了比较。研究结果表明:密封转子稳定性随进汽预旋比的增加而降低;非均匀和均匀进汽条件下迷宫密封腔室周向旋流强度和腔室压力分布的差异随进汽预旋比的增加而逐渐减小,2种进汽条件下密封转子动力特性系数之间的差异随进汽预旋比的增加而减小;与均匀进汽相比,进汽预旋比为0.2时非均匀进汽下迷宫密封交叉刚度至少降低82.7%,交叉阻尼至少增加30.7%;进汽预旋比为0.5时非均匀进汽下迷宫密封有效阻尼仅在涡动频率为50~100 Hz时较均匀进汽低8.4%~12.4%;进汽预旋比增加至0.7时,非均匀和均匀进汽条件下迷宫密封转子动力特性系数基本相同。显然,进汽预旋比较高时进汽均匀性对迷宫密封汽流激振转子动力特性系数的影响可以忽略。
[Abstract]:Based on the rotor multi-frequency elliptical vortex model and the moving grid technique, the URANS equation solution method is used to study the motion. The dynamic characteristics of a labyrinth sealed rotor with steam excitation caused by static blade interference and non-uniform inlet temperature and pressure caused by interstage steam supply are analyzed. The dynamic characteristic coefficients of the labyrinth seal rotor are calculated and analyzed when the prespin ratio of inlet steam is 0.2g 0.50.0.The coefficient is compared with that of the labyrinth seal rotor under uniform inlet temperature and pressure. The results show that the stability of the sealed rotor decreases with the increase of the prespin ratio of inlet steam. The difference between circumferential swirl intensity and chamber pressure distribution of labyrinth seal chamber decreases with the increase of intake prespin ratio. The difference between the dynamic characteristic coefficients of the seal rotor decreases with the increase of the intake prespin ratio under the two kinds of steam inlet conditions. Compared with uniform steam intake, the cross stiffness of labyrinth seal under non-uniform inlet steam is reduced by 82.7%, and the cross damping is increased by 30.7%. The effective damping of the labyrinth seal under the non-uniform inlet steam is only 8.4% 12.4 lower than that of the uniform inlet when the vortex frequency is 50 ~ 100 Hz. The dynamic coefficients of the labyrinth seal rotor are basically the same when the prespin ratio of inlet steam is increased to 0.7. It is obvious that the influence of the uniformity of inlet steam on the dynamic coefficients of labyrinth seal steam flow excited rotor can be neglected when the intake prerotation is high.
【作者单位】： 西安交通大学能源与动力工程学院;先进航空发动机协同创新中心;
【基金】：国家自然科学基金资助项目(51376144)
【分类号】：TH136
本文编号：2366014
[Abstract]:Based on the rotor multi-frequency elliptical vortex model and the moving grid technique, the URANS equation solution method is used to study the motion. The dynamic characteristics of a labyrinth sealed rotor with steam excitation caused by static blade interference and non-uniform inlet temperature and pressure caused by interstage steam supply are analyzed. The dynamic characteristic coefficients of the labyrinth seal rotor are calculated and analyzed when the prespin ratio of inlet steam is 0.2g 0.50.0.The coefficient is compared with that of the labyrinth seal rotor under uniform inlet temperature and pressure. The results show that the stability of the sealed rotor decreases with the increase of the prespin ratio of inlet steam. The difference between circumferential swirl intensity and chamber pressure distribution of labyrinth seal chamber decreases with the increase of intake prespin ratio. The difference between the dynamic characteristic coefficients of the seal rotor decreases with the increase of the intake prespin ratio under the two kinds of steam inlet conditions. Compared with uniform steam intake, the cross stiffness of labyrinth seal under non-uniform inlet steam is reduced by 82.7%, and the cross damping is increased by 30.7%. The effective damping of the labyrinth seal under the non-uniform inlet steam is only 8.4% 12.4 lower than that of the uniform inlet when the vortex frequency is 50 ~ 100 Hz. The dynamic coefficients of the labyrinth seal rotor are basically the same when the prespin ratio of inlet steam is increased to 0.7. It is obvious that the influence of the uniformity of inlet steam on the dynamic coefficients of labyrinth seal steam flow excited rotor can be neglected when the intake prerotation is high.
【作者单位】： 西安交通大学能源与动力工程学院;先进航空发动机协同创新中心;
【基金】：国家自然科学基金资助项目(51376144)
【分类号】：TH136
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