摘要
增加扇涡轮的核心引擎速度被需要,到为引擎技术的下一跳跃得到最好的效率。因为扇子直径很大,前面扇子直接在被连接到核心引擎的产量柄的常规机制有增加线轴速度的限制。作者建议了前面扇子通过空气动力学的转矩变换器在被驾驶的一个新开车系统。当核心引擎以更高的速度更高效地跑时,前面扇子能以常规速度工作。在这份报纸,连续地,通过变换器的流动被 CFX-5 与商业 CFD 代码的 k- 蔚骚乱模型一起数字地模仿。第二等的流动发生在中心墙上显著地沿着司机片的吸表面在片表面,和流动上影响流动条件在后面的边附近分开,它被离心的力量由于车轮旋转背离到片尖端。
It is desired to increase the core engine speed of the turbofan, to get the best efficiency for the next leap of the engine technology. The conventional mechanism in which the front fan is directly connected to the output shaft of the core engine has a limit of increasing the spool speed because the fan diameter is very large. The authors have proposed a new driving system in which the front fan is driven through the aerodynamic torque converter. The front fan can work at the conventional speed while the core engine runs more efficiently at higher speed. Continuously, in this paper, the flow through the converter is simulated numerically by CFX-5 with the k-εturbulence model of the commercial CFD code. The secondary flow occurred on the hub wall affects markedly the flow condition on the blade surfaces, and the flow along the suction surface of the driver blade separates near the trailing edge, which is deviated to the blade tip by the centrifugal force due to the wheel rotation.
关键词
新型涡扇发动机
气动力变矩器
前置风扇
二次流
数值模拟
turbofan engine, torque converter, front fan, numerical simulation, secondary flow, separation