Design and optimization research of swirl recovery vane on a propfan
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摘要:
桨扇-恢复旋流叶片(swirl recovery vane, SRV)结构因其相对对转桨扇结构较为简单的传动机构、较弱的叶尖干涉以及能够为推进系统带来推进效率增益而重新受到关注。基于叶素理论设计思想,以提供推进系统推力、带来推进效率增益为目的,采用跨声速高升阻比翼型,为跨声速桨扇恢复旋流叶片进行了气动外形设计,并将恢复旋流叶片的直径、后掠角以及沿展向叶型截面的扭转角、弦长作为优化设计变量,基于本征正交分解(POD)的降维优化设计方法对恢复旋流叶片进行了优化设计。结果表明:经过设计与优化后的恢复旋流叶片能够为推进系统带来4.83%的推进效率增益,并且使得桨扇后方流场速度分布均匀,具有良好的旋流恢复作用,可以作为高效、低碳排放航空动力系统备选方案。
Abstract:Propfan-Swirl recovery vane (SRV) structure has received renewed attention because of its relatively simple transmission mechanism, weak blade tip interference, and its ability to bring propulsion efficiency gains to the propulsion system. Based on the design idea of blade element theory, the aerodynamic shape design of the transonic propfan-SRV was carried out by using the transonic high lift drag ratio airfoil. The twist angle and chord length of the transverse section blade of the SRV, as well as the diameter and sweep angle of the SRV, were taken as the optimization design variables. A dimensionality reduction optimization design method based on proper orthogonal decomposition (POD) was used to optimize the SRV. The results showed that the optimized SRV can bring 4.83% propulsive efficiency gain to the propulsion system, and make the velocity distribution of the flow field behind the propfan more uniform, which had a good swirl recovery effect and can be used as an efficient and low-carbon aviation power system alternative.
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表 1 采用不同网格量得到的计算结果
Table 1. Results of different numbers of grid
网格数量/万 CT_pf 推力系数
相对误差/%CP_pf 功率系数
相对误差/%290 0.6588 0.98 3.1139 0.37 453 0.6517 3.1271 836 0.6511 0.11 3.1273 0.05 表 2 优化前后恢复旋流叶片推力及推进效率增益对比
Table 2. Thrust and propulsive efficiency of swirl recovery vane before and after optimization
参数 初始设计
构型优化设计
构型变化量 相对
变化率/%推力/N 3.59 5.17 1.58 44$(\uparrow ) $ 推进效率增益/% +3.53 +4.83 +1.30 -
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