Efficient design method for blades of counter⁃rotating ducted fan
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摘要:
基于叶素动量理论的对转涵道风扇桨叶设计方法虽然设计速度快,但设计精度不高。为提高设计方法的设计精度,同时保留设计的快速性,通过CFD计算对基于叶素动量理论的桨叶快速设计方法进行修正,提出一种耦合CFD修正的对转涵道风扇桨叶高效设计方法。通过CFD计算与修正设计的不断迭代,可使设计结果收敛至CFD计算结果,得到满足设计要求的桨叶。结果表明:MRF方法对对转涵风扇性能的求解精度不足,需采用非定常CFD方法。而通过CFD计算结果修正桨叶的拉力占比、入流角及叶素气动力后,对转涵道风扇总拉力设计精度提高10.4%,扭矩设计精度提高18.2%。文中提出的高效设计方法只需进行少量的CFD计算修正便能较好地满足设计要求,进行加速处理后,设计效率进一步提高25%。
Abstract:The design method for the blades of a counter⁃rotating ducted fan based on blade element momentum theory has a fast design speed,but the design accuracy is not high.In order to improve the design accuracy and maintain the design speed,the fast design method based on blade element momentum theory was modified by CFD to propose an efficient design method for the blades of the counter⁃rotating ducted fan coupled with CFD modification.Through continuous iteration of the CFD calculation and modified design,the design results were converged to the CFD results,and the blades meeting the design requirements were obtained.The results showed that the MRF method was not accurate enough to solve the performance of the counter⁃rotating ducted fan,and the unsteady CFD method should be used.After modifying the blade thrust ratio,the inflow angle and blade aerodynamic forces through the CFD results,the design accuracy of the total thrust was improved by 10.4%,and the design accuracy of the torque was improved by 18.2%.The efficient design method used can better meet the design requirements with a small amount of CFD modifications.In addition,the design efficiency was further improved by 25% through the accelerated processing.
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Key words:
- ducted fan /
- counter⁃rotating /
- blade design /
- blade element momentum theory /
- modified design
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表 1 对转涵道风扇性能对比
Table 1. Performance comparison of the counter⁃rotating ducted fan
参数 设计 MRF 0 MRF 1 CFD U /N 218.787 167.519 173.396 163.939 / 27.235 21.939 23.079 22.068 /N 231.069 215.509 203.706 211.173 / 27.235 25.699 25.019 26.015 /N 900.000 773.303 804.781 805.995 表 2 对转涵道风扇修正设计性能对比
Table 2. Performance comparison of the counter⁃rotating ducted fan after modification design
参数 修正1 修正2 修正3 修正4 设计 CFD U 设计 CFD U 设计 CFD U 设计 CFD U /N 197.736 186.298 199.886 196.373 199.003 197.482 199.880 200.188 / 28.395 25.359 28.326 27.518 28.017 27.736 28.206 28.208 /N 221.192 207.125 223.720 220.743 222.614 221.474 223.677 222.103 / 28.395 25.295 28.326 27.672 28.017 27.816 28.206 28.021 /N 900.000 836.225 900.000 891.686 900.000 891.432 900.000 899.119 表 3 对转涵道风扇设计修正参数
Table 3. Design modification parameters of the counter⁃rotating ducted fan
参数 修正1 修正2 修正3 修正4 0.465 0.470 0.468 0.470 1.104 1.096 1.088 1.092 /(°) -1.011 0.387 0.701 0.786 1.052 1.044 1.037 1.041 /(°) -0.493 0.746 0.992 1.053 0.589 0.588 0.591 0.593 表 4 对转涵道风扇加速设计下修正参数变化
Table 4. Variation of modification parameters of the counter⁃rotating ducted fan under accelerated design
参数 修正1 修正2 修正3 0.465 0.466 0.468 1.104 1.087 1.090 /(°) -0.538 0.632 0.759 1.052 1.034 1.038 /(°) 0.064 1.171 1.237 0.589 0.605 0.609 表 5 对转涵道风扇加速设计下性能对比
Table 5. Performance comparison of the counter⁃rotating ducted fan under accelerated design
参数 修正1 修正2 修正3 设计 CFD U 设计 CFD U 设计 CFD U /N 197.736 188.521 197.653 194.572 199.468 200.136 / 28.395 26.057 27.851 27.336 28.006 28.175 /N 221.192 216.579 221.854 223.586 222.199 221.670 / 28.395 26.786 27.851 28.032 28.006 27.975 /N 900.000 868.816 900.000 894.145 900.000 901.625 -
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