摘要
以五叶片的小型轴流风扇为原型,设计出3种不同周向位置分流叶片的模型,采用RNGk-ε湍流模型进行定常数值模拟,对比分析诸模型间的静特性、叶片表面静压分布和涡量分布,选出静特性最佳模型为最优模型对其进行非定常计算,研究其气动噪声性能。结果表明:小型轴流风扇中适当增加分流叶片可以提高静压系数和效率,3种带分流叶片模型叶片表面静压分布均匀,分流叶片可以抑制原型叶片尾缘涡脱落,分流叶片的最优的位置为流道中间,该最优模型前方100mm处的监测点的A计权声压级在各个频段均低于原型模型,功率谱密度峰值均出现基频处,且最优模型的峰值低于原型。研究结果可以为小型轴流风扇结构优化和降噪提供依据。
With five-blade small axial flow fan as prototype,this paper designs models of three splitter blades with different circumferential positions,uses RNGk-εturbulence model for steady numerical simulation,conducts comparative analysis on static characteristics,static pressure distribution on the surface of blade and vorticity distribution of these models,selects the model with optimal statistic characteristics as the optimal model,conducts nonsteady calculation for it and studies its aerodynamic noise performance. The result shows that static pressure coefficient and efficiency can be improved by increasing splitter blades in small axial flow fan appropriately;in three models with splitter blade,static pressure distribution on the surface of blade is uniform;splitter blade can restrain the vortex on the trailing edge of prototype blade from falling off;the optimal position of splitter blade is in the middle of flow channel.A weighting sound pressure level at the monitoring point 100 mm ahead of this optimal model is lower than the prototype model in each frequency range.The peak value of power spectral density occurs in fundamental frequency and the peak value of the optimal model is lower than that of the prototype.The research result can provide basis for structure optimization and noise reduction of small axial flow fan.
出处
《浙江理工大学学报（自然科学版）》
2014年第3期241-246,共6页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金(51076144)
浙江省科技计划项目(2011C16038
2009C13006)
关键词
小型轴流风扇
分流叶片
周向位置
静特性
噪声
small axial flow fan
splitter blade
circumferential position
static characteristics
noise
