摘要
S2反问题法是重要的初始设计评估手段。通过选择合理的损失模型并进行验证,得到了适用于大涵道比风扇的S2反问题评估方法,并系统研究风扇关键几何参数对风扇气动效率的影响规律。结果表明:当进口机匣半径增大到一定程度,增大半径对于风扇效率的改善已不明显;当进口轮毂比大于0.295时,风扇效率将急剧下降;流道形式采用等外径或近似等外径设计时,风扇具有更高的效率;而风扇出口尺寸的选择除满足流量系数的要求之外,还应考虑与下游部件的匹配,以提高整个压缩系统的效率。
The S2 inverse problem is very important in a design process. With the use of a reasonable and verified loss model, an evaluation method is developed for the civil high bypass ratio fan, and the effect of key geometric parameters on the efficiency of the turbofan is investigated. It is shown that, when the radius of the inlet casing is increased to a certain extent, the further increase of the radius does not obviously improve the turbofan efficiency. When the hub ratio is greater than 0.295, the fan efficiency will fall sharply. The constant case diameter design is effective in the improvement of the turbofan efficiency. In the determination of the outlet size, not only the requirement of the flow coefficient, but also the matching with the downstream part have to be taken into account to improve the efficiency of the whole compression system.
出处
《科技导报》
CAS
CSCD
北大核心
2015年第14期97-101,共5页
Science & Technology Review
关键词
民用大涵道比风扇
S2反问题
关键几何参数
civil high bypass ratio turbofan
S2 inverse problem
key geometric parameter
