EXPERIMENT OF ACTIVE FLOW CONTROL OF A HIGHLY-LOADED TURBINE CASCADE
This paper presents mid-span measurements for a turbine cascade with active flow control. Steady VGJs has been used to control the separation characteristics of a high-lift low-pressure tubine airfoil at low Reynolds number. Measurements were made at two jet configurations VGJs for blowing ratios from 0.4 to 8.0, for Reynolds number of 25000. Detailed flow field measurements were made downstream of the cascade using a five-hole pressure probe. The primary focus of the study is on the low-reynolds number, where the baseline airfoil stalls and high profile losses results. It has been found that the use of active flow control is useful at low Reynolds number 25000.VGJs with skew angle is more effective than VGJs without skew angle. At Reynolds number 25000, for the only 30 degree pitch VGJs, a blowing ratio greater 1.6 is required to suppress stall and reduce profile losses to an acceptable level; for the 30 degree pitch and 90 degree skew VGJs, even a very small blowing ratio, the VGJs could suppress separation and reduce profile losses. The optimal blowing ratio for VGJs with skew angle is smaller than the one for VGJs without skew angle. For VGJs without skew angle, the optimal blowing ratio is 3.0 to 4.5, and at these cases, the profile losses is reduced about by 45 percent; for VGJs with skew angle, the optimal blowing ratio is 1.3 to 4.5, and the profile losses is also reduced by 45 percent.
Yi Jinbao Qiao Weiyang
School of Engine and Energy, Northwestern Po lytechnical University, Xian, 710072 P.R.China
国际会议
昆明
英文
373-376
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）