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高参数贯通式袋型阻尼密封动力特性

赵琳慧 张万福 周庆辉 张乃丹 李春

赵琳慧, 张万福, 周庆辉, 等. 高参数贯通式袋型阻尼密封动力特性[J]. 航空动力学报, 2024, 39(1):20220213 doi: 10.13224/j.cnki.jasp.20220213
引用本文: 赵琳慧, 张万福, 周庆辉, 等. 高参数贯通式袋型阻尼密封动力特性[J]. 航空动力学报, 2024, 39(1):20220213 doi: 10.13224/j.cnki.jasp.20220213
ZHAO Linhui, ZHANG Wanfu, ZHOU Qinghui, et al. Dynamic characteristics of fully-partitioned pocket damper seal working with high parameters[J]. Journal of Aerospace Power, 2024, 39(1):20220213 doi: 10.13224/j.cnki.jasp.20220213
Citation: ZHAO Linhui, ZHANG Wanfu, ZHOU Qinghui, et al. Dynamic characteristics of fully-partitioned pocket damper seal working with high parameters[J]. Journal of Aerospace Power, 2024, 39(1):20220213 doi: 10.13224/j.cnki.jasp.20220213

高参数贯通式袋型阻尼密封动力特性

doi: 10.13224/j.cnki.jasp.20220213
基金项目: 国家自然科学基金(51875361); 上海市自然科学基金(20ZR1439200)
详细信息
    作者简介:

    赵琳慧(1997-),女,硕士生,主要研究领域为透平机械密封动力学

    通讯作者:

    张万福(1986-),男,教授、博士生导师,博士,主要研究领域为转子动力学与密封动力学。E-mail:wfzhang@usst.edu.cn

  • 中图分类号: V233.5

Dynamic characteristics of fully-partitioned pocket damper seal working with high parameters

  • 摘要:

    采用计算流体力学方法建立贯通式袋型阻尼密封(FPDS)三维数值计算模型,基于多频椭圆涡动轨迹的密封动力特性求解方法研究了高进口压力、转速及预旋比对FPDS动力特性的影响。结果表明:保持进口压力为7 MPa不变,随压比的增加,有效阻尼增加,穿越频率逐渐减小;压比为7时,有效阻尼随进口压力增加而急剧增大,进口压力为7 MPa时有效阻尼约为进口压力为0.69 MPa的10.26倍,系统稳定性增强显著。当转子转速为25 000 r/min时,较转速为5 000 r/min,穿越频率可增加约62.2 Hz,有效阻尼约降低28.5%,交叉刚度增长约6.94倍,高转速严重影响系统稳定,但转速增大有利于在腔室内形成旋涡,降低密封泄漏。当预旋比为0时,系统最稳定,当增加到预旋比为0.8,交叉刚度约增长4.84倍,穿越频率约增加24.9 Hz,有效阻尼下降,导致系统稳定性降低。

     

  • 图 1  转子椭圆涡动轨迹模型

    Figure 1.  Elliptical whirling orbits of the rotor

    图 2  FPDS几何模型

    Figure 2.  Geometry model of the FPDS

    图 3  FPDS网格分布

    Figure 3.  Grid distribution of the FPDS

    图 4  网格无关性验证

    Figure 4.  Grid independent verification

    图 5  数值计算与实验结果对比

    Figure 5.  Comparison of experimental results and CFD results

    图 6  FPDS各腔室动力特性系数随涡动频率的变化

    Figure 6.  Dynamic characteristic coefficient varying with whirling frequency of each cavity in FPDS

    图 7  FPDS沿流动方向流场特性

    Figure 7.  Flow field characteristics of the FPDS

    图 8  不同压比下FPDS动力特性系数随涡动频率变化

    Figure 8.  Dynamic characteristic coefficient varying with whirling frequency at different pressure ratios

    图 9  不同压比下各腔室穿越频率

    Figure 9.  Crossover frequency in each cavity at different pressure ratios

    图 10  不同压比下密封下游速度矢量变化(n=15000 r/min, λ=0)

    Figure 10.  Velocity vector variation of seal downstream at different pressure ratios (n=15000 r/min, λ=0)

    图 11  不同转速FPDS动力特性系数随涡动频率变化

    Figure 11.  Rotordynamic coefficients varying with whirling frequency of FPDS at different rotational speeds

    图 12  不同转速下各腔室穿越频率

    Figure 12.  Crossover frequency of each cavity at different rotational speeds

    图 13  不同转速下腔室内周向速度沿径向高度分布

    Figure 13.  Circumferential velocity distribution along radial height at different rotational speeds

    图 14  不同预旋比下FPDS动力特性系数随涡动频率变化

    Figure 14.  Rotordynamic coefficientsvarying with whirling frequency at different inlet preswirl ratios

    图 15  不同预旋下FPDS穿越频率

    Figure 15.  Crossover frequency of the FPDS atdifferent inlet preswirl ratios

    图 16  不同预旋下各腔室穿越频率

    Figure 16.  Crossover frequency of each cavity atdifferent inlet preswirl ratios

    图 17  不同进口预旋比下沿轴向的周向速度分布

    Figure 17.  Circumferential velocity changes along the axial length at different inlet preswirl ratios

    图 18  不同预旋比下FPDS压力场分布

    Figure 18.  Pressure distribution of FPDS at different inlet preswirl ratios

    表  1  FPDS几何尺寸

    Table  1.   Dimensions of the FPDS

    参数数值
    密封长度L/mm100.33
    转子直径D/mm170
    密封间隙δ/mm0.3
    挡板厚度t1/mm3.175
    齿数N18
    齿厚t2/mm3.175
    挡板数N28
    主腔室长度l1/mm13.97
    副腔室长度l2/mm6.35
    腔室深度h/mm3.175
    下载: 导出CSV

    表  2  计算工况参数

    Table  2.   Calculation condition parameters

    参数数值及说明
    工质空气 (理想气体)
    湍流模型k-ε
    壁面属性绝热, 光滑
    入口温度T/K287
    时间步长/s0.0001
    涡动频率 f /Hz20, 40, … , 260, 280
    进口压力 pin/MPa0.69, 7
    出口压力 pout/MPa0.1, 0.241 5,0.345, 1.05, 2.45, 3.5
    压比 π7, 3, 2
    进口预旋比λ0, 0.3, 0.4, 0.7, 0.8
    转速 n/103 (r/min)5, 10, 15, 20, 25
    涡动轨迹椭圆
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-15
  • 网络出版日期:  2023-04-07

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