Effects of end condition and aspect ratio on aerodynamic properties of rectangular sectional model
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摘要: 端部条件和展弦比是风洞试验节段模型设计的2个重要因素。为了研究端部条件和展弦比对节段模型气动力特征的影响，开展了不同端部条件和不同展弦比的宽高比5：1矩形断面刚性节段模型静态测压风洞试验。研究结果表明：(1)端部条件和展弦比共同影响着节段模型上流场展向分布。(2)当模型长度大于2倍端部影响区间的长度时，模型上气动力在展向呈现等腰梯形分布；当模型长度小于2倍端部影响区间的长度时，模型上气动力在展向呈现等腰三角形分布。节段模型设计时应重视模型展弦比，合适的展弦比能获得更可靠的结果。Abstract: End condition and aspect ratio of the sectional model are two important influence factors on wind tunnel tests. To investigate the effects of end condition and aspect ratio on the characteristics of aerodynamic force of the sectional models, wind tunnel tests are performed on a stationary B/D=5 rectangular sectional model with various end conditions and aspect ratios. The results indicate that:(1) the aerodynamic force on the rectangular cylinder can be significantly influenced by end condition and aspect ratio; (2) when the length of the cylinder is twice larger than the interference length of end condition, the aerodynamic force distributes in spanwise as an isosceles trapezoid, however, when the length of the cylinder is twice smaller than the interference length of end condition, the aerodynamic force distributes in spanwise as an isosceles triangle. More attentions should be paid to the design on aspect ratio of model for wind tunnel tests. A suitable large aspect ratio of the model may lead to reliable results.
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Key words:
- aerodynamic force /
- wind tunnel test /
- rectangular cylinder /
- end condition /
- aspect ratio
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图 3 试验模型和测点布置
Figure 3. Sketch of the rectangular model indicating pressure tap location
图 6 不同端部条件跨中截面风压均值和标准差(L32)
Figure 6. Mean and standard deviation of wind pressures at mid-span under various end conditions (L32)
图 7 L32E22工况端板S1~S8截面风压均值与标准差
Figure 7. Mean and standard deviation of wind pressures at S1~S8 sections for case L32E22
图 8 不同端部条件各截面风压差异值(L32)
Figure 8. Differences of wind pressures under various end conditions (L32)
图 9 L32不同端部条件阻力均值和标准差展向分布
Figure 9. Spanwise distribution of mean and standard deviation of drags under various end conditions (L32)
图 10 L32不同端部条件升力和力矩标准差展向分布
Figure 10. Spanwise distribution of standard deviation of lifts and moments under various end conditions (L32)
图 11 L32不同端部条件跨中截面升力和力矩功率谱(U=8 m/s)
Figure 11. PSD of lifts and moments at mid-span section under various end conditions for L32(U=8 m/s)
图 12 L32E22工况S1~S8截面升力和力矩功率谱(U=8 m/s)
Figure 12. PSD of lifts and moments at S1~S8 sections for case L32E22(U=8 m/s)
图 13 E64端板不同展弦比跨中截面风压分布特征
Figure 13. Mean and standard deviation of wind pressures at mid-span with various aspect ratio of end plate E64
图 14 E64端板不同展弦比风压分布特征对比
Figure 14. Comparison of wind pressures characteristics at mid-span with various aspect ratio of end plate E64
图 15 E64端板不同展弦比升力和力矩标准差展向分布特征
Figure 15. Spanwise distribution of standard deviation of lifts and moments with various aspect ratios of end plate E64
图 16 不同展弦比跨中截面功率谱(U=8 m/s)
Figure 16. PSD of lifts and moments at mid-span sections with various aspect ratios (U=8 m/s)
表 1 端部条件编号与端板尺寸
Table 1. The number of end conditions and the size of end plates
编号 宽Be/mm 高De/mm E00 0 0 E66 1020 780 E64 1020 540 E44 780 540 E42 780 300 E22 540 300 E21 540 180 E11 420 180 
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