| 叶片转动对涡轮间隙内部流动影响的数值研究 |
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| 引用本文： | 牛茂升,臧述升.叶片转动对涡轮间隙内部流动影响的数值研究[J].力学学报,2009,41(5). |
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| 作者姓名： | 牛茂升 臧述升 |
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| 作者单位： | 上海交通大学机械与动力工程学院叶轮机械研究所,上海,200240 |
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| 摘 要： | 机匣与叶片的相对转动是影响涡轮叶顶间隙流动的重要冈素之一.对LISA 1.5级轴流涡轮间隙内部流动的数值计算结果表明:叶片转动对涡轮间隙流动有阻塞作用.叶片静止时,由于阻塞作用消失,导致间隙入口速度增大,间隙流鼍增加,并且通过间隙的流体全部卷起形成间隙涡.同时在叶片顶部吸力面侧前缘、中部各形成一个间隙涡,使得间隙流动损失增加.而且转速下降会加剧动叶出口截面气流过偏/偏转不足现象.同时叶片静止时,间隙前部各个弦长截面内静压自间隙入口开始一直呈增加趋势,直到叶片尾缘附近截面,间隙截面内静压才逐渐稳定.
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| 关 键 词： | 间隙流动 间隙涡 叶顶分离涡 通道涡 二次流 |
SIMULATION OF EFFECTS OF BLADE ROTATION ON TIP CLEARACNE FLOW IN AXIAL TURBINES |
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| Niu Maosheng
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Zang Shusheng.SIMULATION OF EFFECTS OF BLADE ROTATION ON TIP CLEARACNE FLOW IN AXIAL TURBINES[J].chinese journal of theoretical and applied mechanics,2009,41(5). |
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| Authors: | Niu Maosheng Zang Shusheng |
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| Institution: | 1;Institute of Turbomachinery;School of Mechanical Engineering;Shanghai JiaoTong University;Shanghai 200240;China |
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| Abstract: | Blade rotation is one of the most important factors that affect tip clearance flow in turbine rotors. This paper presents a numerical investigation of flow structures within tip clearance of the LISA 1.5-stage axial turbine.It shows that blade rotation obstructs tip clearance flow in axial turbines.When blades are stationary, relative velocity at gap entrance becomes higher due to the disappearance of blocking effect,to induce much more fluid into tip clearance.Furthermore,all the leakage flow rolls up to f... |
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| Keywords: | tip clearance flow tip clearance vortex tip separation vortex passage vortex secondary flow |
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