Investigation on the flow field characteristics of typical flameholder with non-uniform inflow
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摘要:
为探究加力燃烧室典型稳定器在近似真实来流进口条件下的流场特性，通过用户自定义函数给定进口边界非均匀进气条件（包括速度不均匀和余旋角不均匀），采用雷诺平均方法对某一体化模型加力燃烧室典型稳定器的冷态流场进行了数值模拟，获得了一体化加力燃烧室流场结构、总压损失、流阻损失系数等特征。数值计算结果表明：1）凹腔-中心锥回流区轮廓随速度不均匀度增加而逐渐增大，支板后回流区轮廓随速度不均匀度增加而减小；随余旋角不均匀度增大，凹腔-中心锥回流区轮廓向内缩小，而支板后回流区沿径向向内增大；2）余旋角度大于15°时，支板整流性能显著减弱，在支板压力面气流分离形成回流区，增大燃烧室流动损失；3）随着速度不均匀度或余旋角不均匀度的增加，总压损失及流阻损失系数增大；此外，余旋角度将会增加速度的变化率。
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关键词:
- 一体化加力燃烧室 /
- 典型稳定器 /
- 不均匀来流进口 /
- 流动特性 /
- 加力燃烧室流动数值计算
Abstract:In order to investigate the flow field characteristics of the typical stabilizer of afterburner under the inlet conditions similar to the actual incoming flow, the non-uniform inlet conditions (including non-uniform velocity and non-uniform cosine rotation angle) were given through the user-defined function. Then the cold flow field of the typical stabilizer of an integrated model was numerically simulated using the Reynolds average method. The flow field, total pressure loss and flow resistance loss coefficient were studied. The numerical results showed that: 1) The recirculation zone of the cavity on central cone wall increased gradually with the increase of the velocity non-uniformity, while the recirculation zone of stabilizer decreased. With the increase of non-uniform cosine rotation angle, the reflux flow of the cavity of central cone decreased inward, while the reflux flow of stabilizer increased radially inward. 2) When the cosine rotation angle was greater than 15 °, the flow rectification performance of the stabilizer was significantly weakened, and the flow separation on the pressure surface formed a reflux zone, which increased the flow loss of afterburner. 3) The total pressure loss and flow resistance loss coefficient increased with the increase of velocity nonuniformity and cosine rotation angle nonuniformity. In addition, the cosine rotation angle could increase the velocity variation rate.
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图 1 模型加力燃烧室典型稳定器二维剖面位置示意图
Figure 1. Two-dimensional profile position diagram of typical stabilizer in model afterburner
图 3 不均匀进口分布形式及余旋角定义
Figure 3. Non-uniform inlet distribution and definition of co-rotation angle
图 5 数值方法验证模型及结果对比
Figure 5. Numerical method to verify the model and compare the results
图 7 均匀流时不同截面流场结构分布图
Figure 7. Distribution of flow field structure in different cross sections under uniform flow
图 8 进口速度不均匀分布时S2截面速度分布示意图
Figure 8. The velocity distribution diagram of S2 section when the inlet velocity is unevenly distributed
图 9 扩压器段轴向速度沿径向分布示意图
Figure 9. The axial velocity distribution along the radial direction of the diffuser section
图 10 速度不均匀分布时扩压器段沿程总压损失分布
Figure 10. Distribution of total pressure loss along the diffuser section when the velocity is unevenly distributed
图 11 不同进口条件下vx =0速度等值线分布示意图
Figure 11. The contour distribution of vx = 0 under different inlet conditions
图 12 不同进口条件下回流区流量占进口流量比值统计
Figure 12. Statistics of the ratio of reflux zone flow to inlet flow under different inlet conditions
图 13 速度不均匀下燃烧室冷态沿程参数变化
Figure 13. The variation of cold-state parameters along the combustion chamber under non-uniform velocity
图 14 不同余旋角范围下支板前缘滞止区示意图
Figure 14. Schematic diagram of the stagnation zone at the leading edge of the strut under different co-rotation angles
图 15 S2截面直线上周向速度分布
Figure 15. Circumferential velocity distribution on the straight line of S2 section
图 16 S2截面不同
$ x/\Delta R $ 上余旋角度沿径向分布Figure 16. The spin angle distribution along the radial direction at different
$ x/\Delta R $ in S2 cross section
图 17 三维等值面及二维等值线示意图（vx =0）
Figure 17. Three-dimensional isosurface and two-dimensional contour diagram （vx = 0）
图 18 余旋角不均匀时冷态性能参数示意图
Figure 18. Cold-state performance parameter diagram when the corotation angle is not uniform
表 1 进口来流气动条件
Table 1. Aerodynamic conditions of inlet flow
进口
总压/kPa进口
马赫数Ma进口
总温/K进口质量流量/
（kg/s）155 0.35 1075 3.489 
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表 2 燃烧室进口变量
Table 2. Combustion chamber inlet variables
工况 不均匀类型 δv 进口马赫数Ma case1 均匀流 0 0.35 case2 速度
不均匀进口30% 0.35 case3 40% 0.35 case4 50% 0.35 case5 余旋角
不均匀进口12.5% 0.35 case6 13.4% 0.35 case7 14.3% 0.35
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表 3 数值方法验证时工况表
Table 3. Numerical method validation working condition table
进口
马赫数进口质量流量/
（kg/s）进口
温度/K进口
静压/kPa0.25 1.723 518 113.94
下载: 导出CSV
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