出口宽高比对S弯喷管流固耦合特性影响

doi:10.7527/S1000-6893.2022.28204

Abstract

Abstract:

The influence of the aspect ratio on two-way fluid-structure interaction characteristics of double serpentine nozzles for turbofan engines was investigated by the serial two-way loosely coupled algorithm. The results show that the structural displacement characteristics of the serpentine nozzle are mainly located in the downstream channel of the first bend and the exit upper wall of the equivalent section of the nozzle， and that with the increase of the aspect ratio， the displacement of the downstream area of the first bend of the nozzle gradually increases， while that of the exit of the nozzle first increases and then decreases. The maximum displacements of the upper and lower walls of the serpentine nozzle both appear in the downstream wall of the first bend. Because of the outward expansion of the nozzle outlet wall， the outlet aspect ratio decreases compared with the design value under fluid-structure interaction. The fluid-structure interaction influences the flow field characteristics and flow losses of different aspect ratios. The flow vortex caused by the deformation of the nozzle structure has a large influence on the downstream flow of the nozzle with a small aspect ratio. In this case， the axial bending angle of the nozzle decreases and the thrust vector angle decreases. In the case of large aspect ratios， the nozzle axial bending angle increases with the increase of the aspect ratio， and the thrust vector angle increases. At an aspect ratio of 2， the total pressure recovery coefficient is reduced by 0.56%， the flow coefficient 2.67% and the thrust coefficient 0.72%， while the three are reduced by 0.36%， 4.34% and 1.37%， respectively， when the aspect ratio is 10.

Key words: double serpentine nozzle, fluid-structure interaction, aspect ratios, aerodynamic performance, structural displacement, influence mechanism

CLC Number:

V231.3

Qiulin LI, Li ZHOU, Peng SUN, Jingwei SHI, Zhanxue WANG. Influence mechanism of aspect ratio on fluid-structure interaction characteristics of serpentine nozzle[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(14): 628204-628204.

Figures/Tables 27

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几何参数	数值
喷管长度L/mm	2 098.2
喷管直径D/mm	807
第一弯出口面积A₁/m²	0.307
第一弯出口宽高比W₁/H₁	0.337
第二弯/第一弯长度比L₂/L₁	1.838
第一弯纵向偏距ΔY₁/L₁	-0.284
第二弯纵向偏距ΔY₂/L₂	0.450
喷管出口宽高比W_e/H_e	6
等直段长度直径比L₃/D	0.309

结构参数	数值
弹性模量E/GPa	210
密度ρ/（kg·m^-3）	8 100
泊松比μ	0.38

时间步长/ms	变形量/mm	误差值/%
1	31.03	0.77
2	30.80
4	30.23	1.84

位置	相对位置x/L	原模型Y值/mm	实验变形量/mm	数值变形量/mm	误差值/%
S弯第一弯下游上壁面	0.62	30.8	1.66	1.645	9.0
出口上壁面	1.00	51.1	2.80	2.545	9.1
出口下壁面	1.00	24.9	2.91	2.654	8.8

出口宽高比W_e/H_e	第二弯纵向偏距ΔY₂/L₂
2	0.501
3	0.481
4	0.467
5	0.457
6	0.450
7	0.443
8	0.438
10	0.428

Influence mechanism of aspect ratio on fluid-structure interaction characteristics of serpentine nozzle

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设计宽高比	耦合作用下宽高比	变化率/%
2	1.87	-6.43
3	2.69	-10.12
4	3.51	-12.24
5	4.33	-13.36
6	5.09	-15.36
7	6.10	-12.89
8	7.08	-11.47
10	9.25	-7.45

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