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Aerodynamic design of an ultra-low rotating speed geared fan

机译：超低转速齿轮风扇的空气动力学设计

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For a geared fan with a high bypass ratio, it is easy to reduce its rotating speed by increasing the gear's reduction ratio without changing the original structure of the turbofan engine. A reduction in the rotating speed can effectively reduce the aerodynamic noise of the engines. In addition, due to the low rotating speed, the requirement for structural strength decreases, thus the blade thickness can be reduced, further effectively reducing the engine's weight. This study presents a new concept of diffusion blade profiles for designing a fan rotor with an ultra-low rotating speed. The blade profiles of the new concept are characterized by large cambers and convergent blade passages in their rear parts. A large camber contributes to an ultra-high load, and a convergent blade passage contributes to the control of the growth of the boundary layers on blade surfaces and reduces the flow losses. Flow field numerical simulations show that the designed fan has nearly the same mass flow rate and total pressure ratio as an existing fan, but its rotating speed is only 2240 RPM, much lower than that of the existing fan (3700 RPM), and its efficiency at design point is 0.964. Research on stacking line sweep indicates that the forward sweep at blade root can effectively reduce the relative Mach number at the outlet, thus reducing the losses from shock waves and increasing the efficiency. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：对于具有高旁通比的齿轮风扇，通过增加齿轮的减速比而不改变涡轮风扇发动机的原始结构，很容易降低其转速。转速的降低可以有效地降低发动机的空气动力噪声。另外，由于转速低，对结构强度的要求降低，因此可以减小叶片厚度，从而进一步有效地减轻了发动机的重量。这项研究提出了一种用于设计超低转速风扇转子的扩散叶片轮廓的新概念。新概念的叶片轮廓的特点是后部大弧度和会聚叶片通道。大的外倾角导致超高负载，而会聚的叶片通道有助于控制叶片表面边界层的生长并减少流动损失。流场数值模拟表明，所设计的风扇具有与现有风扇几乎相同的质量流率和总压比，但其旋转速度仅为2240 RPM，远低于现有风扇（3700 RPM），并且效率设计点为0.964。对堆垛线扫掠的研究表明，叶片根部的前掠可以有效地减少出口处的相对马赫数，从而减少了冲击波的损失并提高了效率。 （C）2016 Elsevier Masson SAS。版权所有。

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