摘要
为了解气膜冷却技术中孔型作用的影响,采用数值模拟方法,在主流速度20m/s,湍流度6%,主、射流温分别为333K和293K的条件下,考察无复合角、流向角为35°时的圆柱孔、收缩-扩散孔和反涡孔进行平板气膜冷却的冷却效果。其中,圆孔孔径12.7mm,长径比3.5,与集气室连接面形式同于其余孔型。模拟过程中,湍流Real-izable k-ε方程,标准壁面函数处理边界,SIMPLEC算法实现压力、速度耦合。结果表明:由于反涡射流抑制了肾型涡的形成并减弱了肾型涡的强度,反涡孔的冷却效果和覆盖区域优于其他两孔型。
To understand the influence of hole pattern in air film cooling technique, this paper investigates the cooling effect of flat air film cooling of cylindrical hole, shrinkage-diffusion hole and vortex hole when there is no compound angle and the angle of current is 35° under the conditions of main flow speed 20 m/s, turbulivity 6 G, main flow temperature 333K and jet flow temperature 293K with numerical simu- lation method. The aperture of round hole is 12.7 mm and length-diameter ratio is 3.5. The form of its joint face with plenum chamber is the same as other hole patterns. In the simulation process, pressure and velocity coupling is realized by turbulent flow Realizable k-ε equation, standard wall function boundary treatment and SIMPLEC algorithm. The result shows that as vortex jet flow inhibits the formation of kidney vortex and reduces the intensity of kidney vortex, the cooling effect and coverage area of vortex hole are superior to other two hole patterns
出处
《浙江理工大学学报（自然科学版）》
2013年第3期340-344,共5页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
浙江省自然科学基金资助项目(Y1090869)
浙江省科技厅公益技术研究工业项目(2012C21052)
浙江省重中之重学科和浙江理工大学重点实验室优秀青年人才培养基金(ZSTUMD2011B011)
关键词
气膜冷却
数值模拟
孔型
肾型涡
air film cooling
numerical simulation
hole pattern
kidney vortex
