摘要
本文介绍了变工况下，两台具有相同几何参数（动叶弦长除外）的轴流试验风机进行的气动一声学性能的实验研究。一台动叶是常规（径向）动叶，另一台是弯掠动叶（其弦长在中往处增加２０．４％。实验表明：在相同转速条件下，弯掠动叶轴流风机与径向动叶风机相比，不仅提高了气动效率（３％左右），降低了气动噪声（２～４ｄＢ（Ａ）（在最高效率点处，弯掠动叶与径向动叶相比压升增加了１３．１％，流量增加了５％），而且还大幅度地扩大了稳定工作范围（２０％左右）。弯掠动叶在旋转失速工况下性能曲线平坦，并且其旋转失速特征参数明显不同于径向动叶。弯掠动叶的总声压级和噪声频谱也表明了弯掠动叶具有低噪声的特点。
The experiments of variable working conditions on aerodynamic and aeroacoustic performance of axial fans with conventional (radial) rotating blades and skewed-swept rotatingblades carried out are dealt with in the present paper. The rotating blades are equipped withsame geometrical parameters (except the chord). Two prototype fans are designed. One is abase line fan with blades stocking lines radially oriented, and the other is one with skewedswept ratating baldes of increasing greater forward skew. The performance testing is done onthe condition that the fans have same rotating speed. Steady working range is widened about20 percent, aerodynamic efficiency increased about 2-4 percent. Noise testing of the fans iscarried out' and the results show an average noise reduction for the skwewd-swept-bladed fan of about 2-4 dbA overall, and a reduction of pure tone noise at blade-pass-efficiencyof about 5 dbA compared to the zero-skew baseline model. Performance curve of skewedswept rotating blades is plain at rotating stall, its characteristic parameters of rotating stallis different from that of radial rotating blades. Aeroacoustic testing shows that the fan withskewed-swept rotating blades has advantages of low noise.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1996年第3期280-285,共6页
Journal of Engineering Thermophysics
关键词
弯掠动叶
轴流风机
气动一声学性能
变工况
skewed-swept rotaing blade, axial flow fan, aerodynamic-aeroacoustic performance, variable working condition
