基于RBF神经网络的压气机叶片面压力场预测研究

姚明辉; 王兴志; 吴启亮; 牛燕

doi:10.21656/1000-0887.440054

基于RBF神经网络的压气机叶片面压力场预测研究

doi: 10.21656/1000-0887.440054

1.
天津工业大学航空航天学院，天津 300387
2.
天津工业大学控制科学与工程学院，天津 300387

基金项目:

国家自然科学基金项目 11972253

天津市自然科学基金重点项目 19JCZDJC32300

详细信息

通讯作者:
姚明辉(1971—)，女，教授，博士，博士生导师(通讯作者. E-mail: merry_mingming@163.com)

中图分类号: O31
计量
- 文章访问数: 515
- HTML全文浏览量: 249
- PDF下载量: 80
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-02
- 修回日期: 2023-05-10
- 刊出日期: 2023-10-31

RBF Neural Network Based Prediction on Blade Surface Pressure Fields in Compressors

1.
School of Aeronautics and Astronautics, Tiangong University, Tianjin 300387, P.R.China
2.
School of Control Science and Engineering, Tiangong University, Tianjin 300387, P.R.China

摘要

摘要: 航空发动机压气机内部流道气流特性复杂，叶片所处的涡状流场具有高压、高速、旋转和非定常等特点，因此，亟需高效、准确地计算和预测压气机叶片复杂流场的气动特性. 该文针对航空发动机叶片复杂流场的研究，通过计算流体动力学(computational fluid dynamics, CFD)方法，生成不同工作状态下的叶片表面气动载荷分布. 采用径向基函数(radial based function, RBF)神经网络建立压力面表面气动载荷预测模型，将神经网络建模方法与流场计算相结合，神经网络方法能够对基于CFD的数据集进行学习和训练，适当地弥补来自计算流体动力学的误差，为有效预测航空发动机压气机叶片复杂流场提供了参考渠道.
- 径向基神经网络 /
- 计算流体动力学 /
- 压气机叶片流场
Abstract: The airflow characteristics of the internal flow path of an aero-engine compressor are complex, and the vortex flow field around the blade is characterized by high pressure, high speed, rotation, and unsteadiness. Therefore, there is an urgent need to calculate and predict the aerodynamic characteristics of the complex flow field around the compressor blade efficiently and accurately. The computational fluid dynamics (CFD) method was used to generate the aerodynamic load distribution on the blade surface under different operating conditions for the study of the complex flow fields around aero-engine blades. The radial based function (RBF) neural network was applied to establish the pressure surface aerodynamic load prediction model, and the neural network modeling method was combined with the flow field calculation. The neural network method can learn and train the CFD-based data set to properly compensate the errors from the CFD, which provides a reference for the effective prediction of the complex flow fields around aero-engine compressor blades.
- radial basis neural network /
- computational fluid dynamics /
- compressor blade flow field

HTML全文

图 1 叶片网格划分

Figure 1. The blade meshing

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图 2 流道网格划分

Figure 2. The flow field channel meshing

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图 3 收敛图

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 3. The convergence plot

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图 4 叶片在流道中的位置分布

Figure 4. The blade position distribution in the flow passage

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图 5 压力面气流方向图

Figure 5. The flow direction diagram of the pressure surface

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图 6 吸力面气流方向图

Figure 6. The flow direction diagram of the suction surface

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图 7 叶片区域分布

Figure 7. The leaf area distribution

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图 8 选取的叶片线形数据

Figure 8. The selected leaf profile data

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图 9 各条线形位置

Figure 9. Positions of each line type

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图 10 RBF神经网络结构

Figure 10. The RBF neural network structure

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图 11 转速5 000 r/min下叶片中部、尖部、根部RBF神经网络预测结果

Figure 11. RBF neural network prediction results for the middle, the tip and the root at 5 000 r/min

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图 12 实验编号36的RBF预测数据与CFD计算数据对比

Figure 12. Comparison of RBF prediction data and CFD calculation data for experiment number 36

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图 13 实验编号37的RBF预测数据与CFD计算数据对比

Figure 13. Comparison of RBF prediction data and CFD calculation data for experiment number 37

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图 14 实验编号38的RBF预测数据与CFD计算数据对比

Figure 14. Comparison of RBF prediction data and CFD calculation data for experiment number 38

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图 15 实验编号39的RBF预测数据与CFD计算数据对比

Figure 15. Comparison of RBF prediction data and CFD calculation data for experiment number 39

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图 16 实验编号40的RBF预测数据与CFD计算数据对比

Figure 16. Comparison of RBF prediction data and CFD calculation data for experiment number 40

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表 1 实验设计

Table 1. Experimental design

experiment №.	rotational speed ω/(r/min)	entrance flow q/(kg/s)	temperature T/K	outlet static pressure P_o/Pa
1	4 000	1	280	150 000
2	4 000	3	300	160 000
3	4 000	5	320	170 000
4	4 000	7	340	180 000
5	4 000	9	360	190 000
6	8 000	1	280	150 000
7	8 000	3	300	160 000
8	8 000	5	320	170 000
9	8 000	7	340	180 000
10	8 000	9	360	190 000
11	12 000	1	280	150 000
12	12 000	3	300	160 000
13	12 000	5	320	170 000
14	12 000	7	340	180 000
15	12 000	9	360	190 000
16	16 000	1	280	150 000
17	16 000	3	300	160 000
18	16 000	5	320	170 000
19	16 000	7	340	180 000
20	16 000	9	360	190 000
21	20 000	1	280	150 000
22	20 000	3	300	160 000
23	20 000	5	320	170 000
24	20 000	7	340	180 000
25	20 000	9	360	190 000
26	4 000	5	300	150 000
27	4 000	7	300	150 000
28	8 000	5	300	150 000
29	8 000	7	300	150 000
30	12 000	5	300	150 000
31	12 000	7	300	150 000
32	16 000	5	300	150 000
33	16 000	7	300	150 000
34	20 000	5	300	150 000
35	20 000	7	300	150 000
36	4 000	3	300	150 000
37	8 000	3	300	150 000
38	12 000	3	300	150 000
39	16 000	3	300	150 000
40	20 000	3	300	150 000

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表 2 误差对比结果

Table 2. Error comparison results

rotational speed ω/(r/min)	4 000	8 000	12 000	16 000	20 000
error δ/%	4.59	4.29	2.42	1.33	5.52

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表 3 其他转速条件下的预测误差

Table 3. Prediction errors at other speed conditions

rotational speed ω/(r/min)	entrance flow q/(kg/s)	temperature T/K	outlet static pressure P_o/Pa	error δ/%
5 000	3	300	150 000	1.2
6 000	3	300	150 000	2.3
7 000	3	300	150 000	2.6
9 000	3	300	150 000	2.7
10 000	3	300	150 000	3.1
11 000	3	300	150 000	2.4
13 000	3	300	150 000	2.6
14 000	3	300	150 000	3.1
15 000	3	300	150 000	2.6
17 000	3	300	150 000	2.4
18 000	3	300	150 000	2.5
19 000	3	300	150 000	3.0

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