Turbine vane leading edge features the highest heat load and is effectively protected by multi-row film-ejections. In present work, time-resolved planar quantitative light sheet (QLS) technique was proposed to acquire unsteady behaviors of film coverage and jet-trajectory caused by fluid-interaction. Under proper calibrations, the uncertainty of transient concentration measurement was controlled below 4.5%. Leading edge zone of a typical film-cooled vane was simplified into a cylinder with double-row staggered cylindrical-holes. One row locates at the stagnation line and the other is in the downstream. The effect of inclination angle of film-holes on the unsteady film coverage and the concentration-interactions of two rows was of concern. Transient tests revealed that row-to-row interaction can generate higher time-averaged film cooling effectiveness; however, improve the unsteadiness of film outflow, an adverse factor of component durability. Relative to the downstream hole-row, the ejections in stagnation line dominated much stronger unsteadiness. The angle effect on film cooling unsteadiness in stagnation line was significant; however, in the downstream was nearly non-sensitive. Along the vane span, the irregular relationships of unsteadiness with hole-location and hole-angle can be found. Consequently, some new suggestions of film cooling design in stagnation region were proposed based on the aforementioned unsteadiness analysis.

涡轮叶片前缘具有最高的热负荷，并通过多排薄膜喷射得到有效保护。在目前的工作中，时间分辨平面定量光片（QLS提出了一种获取由于流体相互作用引起的薄膜覆盖和射流轨迹的非稳态行为的技术。在适当的校准下，瞬态浓度测量的不确定度控制在4.5％以下。典型的薄膜冷却叶片的前缘区域被简化为具有双排交错圆柱孔的圆柱体。一排位于停滞线，另一排位于下游。膜孔的倾斜角度对不稳定膜的覆盖率和两行浓度-相互作用的影响值得关注。瞬态测试表明，行对行的交互可以产生更高的时间平均胶片冷却效率。但是，改善了膜流出的不稳定性，这是部件耐久性的不利因素。相对于下游孔排，停滞线上的弹射起了更大的不稳定作用。停滞线对薄膜冷却不稳定性的角度影响显着；但是，在下游几乎不敏感。沿着叶片跨度，可以发现不稳定与孔位置和孔角度的不规则关系。因此，在上述不稳定性分析的基础上，提出了滞流区膜冷却设计的一些新建议。