论文部分内容阅读
采用一维设计程序分析了前后转子设计转速比的影响,研究了平均半径处的增压比、绝热效率、扩散损失和激波损失随转速比的变化规律.用计算流体力学分析了设计点与非设计状态的两个对转级流场,研究了其详细物理现象.结果表明两个对转级的设计与非设计性能均良好.发现低速风扇的两个转子均为常规跨声速转子,而高速风扇的前转子常规,后转子则为前缘激波和通道激波均贯穿全叶展的全超声速转子.同时发现,均带有与常规风扇级相当的失速裕度,低速对转级是两个转子同时达到失速点并且激波被推出叶栅,而高速对转级则是后转子先达到失速点并激波推出,从而后转子决定着级失速裕度.
One-dimensional design program was used to analyze the influence of front-rear rotor design speed ratio, and the variation law of supercharging pressure ratio, adiabatic efficiency, diffusion loss and shock loss with speed ratio at mean radius were studied. The results show that both the rotor and the rotor of the low-speed fan are conventional transonic rotors, and the results show that the design and non-design performance of the two pairs are good. The front rotor of the high-speed fan is conventional, while the rear rotor is the full-speed supersonic rotor with the leading shock and the channel shock all penetrating the full-leaf stage.At the same time, it is found that both of them have the same stall margin as the conventional fan stage, Both rotors reach the stall point at the same time and the shock is pushed out of the cascade, while in the high-speed stage, the after-rotor reaches the stall point first and the shock wave is launched, so that the posterior rotor determines the stall level.