ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Investigation of Counter Rotating Fan Design Technology
Received date: 2013-06-13
Revised date: 2013-08-27
Online published: 2013-09-11
Supported by
Aeronautical Science Foundation of China (2008ZB06011)
Aiming at investigation of engineering application, the counter rotating fan design technology for a civil high bypass ratio engine is researched including aerodynamic concept demonstration, aerodynamic design technology investigation, mechanical and flutter analysis, acoustic behavior analysis, off-design point matching and adjustment, and flow simulation of inlet distortion. Certain issues that might be encountered in future engineering application and their possible solutions are summarized. Compared with a conventional fan, the operation point of the rear stage for the counter rotating fan changes considerably. Therefore, too large a design incidence angle of the rear stage cannot be selected. Since flutter does not occur at the design point in this paper, it does not present a big issue, although the counter rotating fan rotors have a low vibration frequency due to their low rotational design speed. The counter rotating fan is effective in reducing noise emission because of its low rotational speed, and only 90 dB of far field sound pressure level is found in this paper. The counter rotating fan is found to perform well at off-design point. It seems unnecessary to open the stagger angle of the rear rotor for engineering application. Distortion passes through counter rotating fan blades with less damping, and the counter rotating makes the circumferential phase movement of the outlet distortion area unconspicuous.
Key words： counter rotating fan; aerodynamic design; flutter; noise; off-design point; matching; distortion
YANG Lin , CHEN Lei , SUN Hai , YANG Mingsui . Investigation of Counter Rotating Fan Design Technology[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(5) : 1226 -1235 . DOI: 10.7527/S1000-6893.2013.0375
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