基于中心分级燃烧室的冷态湍流质量交换大涡模拟

肖周世冀; 肖为; 曹俊; 陶焰明

doi:10.13224/j.cnki.jasp.20230033

基于中心分级燃烧室的冷态湍流质量交换大涡模拟

doi: 10.13224/j.cnki.jasp.20230033

中国航发湖南动力机械研究所燃烧室研究部，湖南株洲 412002

基金项目: 国家自然科学基金（51906234）

详细信息

作者简介:
肖周世冀（1998-），男，助理工程师，硕士生，主要从事航空发动机燃烧室性能与仿真研究

中图分类号: V231.2
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出版历程
- 收稿日期: 2023-01-14
- 网络出版日期: 2024-08-12

Large eddy simulation of cold turbulence mass exchange based on concentric staged combustor

Combustor Research Department，Hunan Aviation Powerplant Research Institute，Aero Engine Corporation of China，Zhuzhou Hunan 412002，China

摘要

摘要:
为研究中心分级燃烧室级间湍流脉动质量交换特性，对9种旋流器及压损组合方式下的中心分级燃烧室进行了冷态大涡模拟及部分粒子成像测速仪光学试验验证，提出了一种新湍流交换量化方法并获得了9种组合方式下湍流交换现象的变化规律。研究结果表明：旋流器布置不变时湍流交换强度近似与燃烧室进口质量流量成正比例关系；与此同时，旋流器非同旋向布置将导致各级旋流器出流之间的关系由协同转变为拮抗，增大的级间动量耗散导致中心回流区难以继续在主燃级一级旋流器出流压迫下保持稳定形态，最终导致中心回流区向头部方向收缩，并大幅降低其中心回流区的湍流交换强度，当值班级二级旋流器反旋时，降幅达70%左右；在细长形态回流区中，湍流交换最强烈的区域位于回流区的中间位置。
- 航空发动机 /
- 中心分级燃烧室 /
- 大涡模拟 /
- 湍流交换 /
- 粒子成像测速仪
Abstract:
To study the characteristics of turbulence fluctuation mass exchange between the concentric staged combustor stages, large eddy simulation was conducted for 9 kinds of swirlers and total pressure loss combination schemes, and partial combination schemes were verified by particle image velocimetry optical experiments. A new quantitative method of turbulence exchange was proposed and the variety rules of turbulence exchange phenomena in 9 kinds of combination schemes were achieved. The results showed that the intensity of turbulence exchange was in direct proportion to the inlet mass flow when the swirlers were kept constant, meanwhile, counter-rotating swirlers caused the relationship between swirlers outlet flow to change from synergism to antagonism, the increased momentum dissipation between main swirlers and pilot swirlers made it difficult for central recirculation zone to maintain a stable state under the repression of first main swirler outlet flow. Finally this made the central recirculation zone contract towards the combustor dome and reduced the intensity of turbulence exchange in the central recirculation zone. In case of counter-rotating, of the 2nd pilot swirler, the intensity reduction of turbulence exchange reached about 70%. And in the slender recirculation zone, the region with the strongest turbulence exchange was in the middle of the recirculation zone.
- aero-engine /
- concentric staged combustor /
- large eddy simulation /
- turbulence exchange /
- particle image velocimetry

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图 1 湍流交换过程示意图

Figure 1. Schematic of turbulence exchange process

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图 2 中心分级燃烧室旋流器示意图

Figure 2. Schematic of concentric staged combustor swirlers

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图 3 中心监控点总压变化趋势

Figure 3. Tendency of central monitor point total pressure

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图 4 中心监控点频率-压力振幅分布图

Figure 4. Frequency-pressure amplitude distribution of central monitor point

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图 5 状态点1的中心截面流线

Figure 5. Central section streamline of state point 1

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图 6 状态点4的中心截面流线

Figure 6. Central section streamline of state point 4

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图 7 时均轴向速度对比

Figure 7. Comparison of time-averaged axial velocity

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图 8 状态点1、状态点4、状态点9的中心回流区对比

Figure 8. Central recirculation zone comparison of state points 1, 4 and 9

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图 9 状态点1～状态点6大涡模拟中心截面时均轴向速度云图

Figure 9. Central section time-averaged axial velocity contours of state points 1 to 6 by large eddy simulation

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图 10 状态点4～状态点8的湍流交换量拟合

Figure 10. Turbulence exchange amount fitting of state points 4 to 8

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图 11 湍流交换量轴向分布

Figure 11. Turbulence exchange amount distribution along axis

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表 1 各状态点边界条件及旋流器布置

Table 1. Boundary condition and swirler arrangement of each state point

状态点	总压损失/%	燃烧室进口质量流量/（kg/s）	燃烧室进口温度/K	燃烧室进口压力/Pa	旋流器布置
1	2.0	0.0566	298	103250	值班级二级旋流器反旋
2	2.9	0.0685	298	103250	值班级二级旋流器反旋
3	4.9	0.0907	298	103250	值班级二级旋流器反旋
4	2.0	0.0554	298	103250	三级旋流器同旋向
5	2.9	0.0677	298	103250	三级旋流器同旋向
6	4.9	0.0890	298	103250	三级旋流器同旋向
7	7.7	0.1125	298	103250	三级旋流器同旋向
8	9.5	0.1230	298	103250	三级旋流器同旋向
9	2.0	0.0570	298	103250	主燃级一级旋流器反旋

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表 2 各监控点总压变化周期

Table 2. Total pressure change cycle of each monitor point

监控点	监控点相对位置/mm	变化周期/步
中心监控点	0	1300
监控点1	−40	3000
监控点2	−20	7500
监控点3	20	752
监控点4	40	714

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表 3 时均轴向速度方均根误差

Table 3. Root mean square error of time-averaged axial velocity %

状态点	三维时均LES轴向速度方均根误差
1	10.00
2	14.32
3	10.36
4	13.53
5	6.81
6	3.96

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表 4 各状态点湍流交换量

Table 4. Turbulence exchange amount of each state point

状态点	值班级一级旋流器旋流数	值班级一级旋流器质量流量/（kg/s）	值班级二级旋流器旋流数	值班级二级旋流器质量流量/（kg/s）	主燃级一级旋流器旋流数	主燃级一级旋流器质量流量/（kg/s）	湍流交换量/ （kg/s）
1	1.17	0.0059	−1.12	0.0106	0.57	0.0341	0.0062
2	1.17	0.0071	−1.12	0.0125	0.57	0.0432	0.0090
3	1.17	0.0095	−1.12	0.0171	0.57	0.0571	0.0122
4	1.17	0.0059	1.12	0.0106	0.57	0.0341	0.0227
5	1.17	0.0073	1.12	0.0130	0.57	0.0420	0.0309
6	1.17	0.0089	1.12	0.0164	0.57	0.0553	0.0385
7	1.17	0.0111	1.12	0.0209	0.57	0.0702	0.0434
8	1.17	0.0236	1.12	0.0127	0.57	0.0781	0.0494
9	1.17	0.0059	1.12	0.0104	−0.57	0.0358	0.0104

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