Analysis of Counter-rotating Fan Bases on Empirical Model
SUN Chang-lin;WANG Yan-gang;School of Power and Energy,Northwestern Polytechnical University;
The comparison and analysis of the accuracy of Heidmann model,K- J- G model and H- W model to two kind of fan noise prediction which are CF6- 80C2 and CRTF fan's are presented. These algorithms for fan noise are used to predict the far field noise radiated from traditional fan and counter-rotating fan when the plane takes off. The calculation results show that the noise level of CF6- 80C2 fan which predicted by Heidmann model is approximately equal to K- J- G model's. The results of the H- W model and other two models differ 2 ~ 5 dB in the high frequency part. The counter- rotating fan noise spectrum is close to the traditional's in the trend. The research object and results of this paper show that the traditional fan which has similar performance parameters approximates to the noise level of counterrotating fan. The counter-rotating fan doesn't have more advantages compared with traditional fan in noise reduction.