| 摘要: |
| 用Ｘ型双丝热线探头对扇形气膜孔射流下游流场的测量结果表明，湍流因射流的注入而显著增强，并存在十分明显的各向非同性。传统的应力和速度梯度的涡粘关系仍然适用于气膜冷却流场，但应该在不同的方向上分别对湍流粘性系数进行修正。标准ｋ－ε湍流模型可成功地模拟孔内流动和流向倾角α较小时的掺混气膜冷却流场，但在α较大时的孔中线附近区域内的流场模拟是不成功的，并导致冷却效率的模拟失败。 |
| 关键词: 涡轮叶片 薄膜冷却 气体冷却 喷流试验 湍流模型 数值分析 |
| DOI： |
| 分类号:V232.4 |
| 基金项目: |
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| EXPERIMENTAL STUDY AND ANALYSIS OF NUMERICAL COMPUTATION IN THE FLOW FIELD OF FILM COOLING |
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Xu Hongzhou1, Wang Shangjin1, Liu Songling2, Xu Duchun2
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1.ER Fluid Machinery Engineering Research Center,Xi′an Jiaotong Univ.,Xi′an,710049;2.Dept.of Aeroengine,Northwestern Polytechnical Univ.,Xi′an,710072
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| Abstract: |
| An experimental study on velocity and turbulence fields downstream of a single film hole jet has been completed by using X probe of hot wire(DISA55M).A fan shaped hole with flared angle of 15° was adopted in the experiment.Under the influence of jet,the turbulence level is obviously increased and strong anisotropic turbulence exists in the downstream of the hole.In the regions unaffected by the jet,the turbulence can be still regarded as isotropic.The general eddy viscosity relationships are adaptable yet for simulating the shear stresses in film cooling flow fields.However,the eddy viscosity variation itself is rather complex in these regions that it requires significant modification in different directions.Compared with experimental data,the calculated results of the standard k ε turbulence model could be successful in internal flow of the hole and downstream of jet with the small streamwise inclined angle.In the case of large streamwise angle,the velocity and film cooling effectiveness were underpredicted with this kind of turbulence model.It might be necessary to introduce a nonisotropic turbulence model in the simulation of film cooling flow fields |
| Key words: Turbine blade Film cooling Gas cooling Jet test Turbulence model Numerical analysis |
