跨声速涡轮叶顶间隙流动传热特性的数值研究
发布时间：2018-09-07 09:29
【摘要】：针对叶顶间隙的高速泄漏流及复杂的流动问题,采用求解三维Reynolds-Averaged NavierStokes(RANS)和S-A湍流模型的方法研究了跨声速流动条件下涡轮叶片顶部的流动传热特性,同时计算分析了叶顶间隙高度和进口湍流强度对顶部流动换热特性的影响。研究结果表明:叶顶间隙为0.188%动叶高度(小间隙)时,间隙泄漏流为亚声速(0.3Ma0.8)并具有最大的叶顶换热系数;当叶顶间隙高度增大至0.75%动叶高度时,间隙泄漏流出现超声速流动(1.0Ma1.3),叶顶平均换热系数最小;随着间隙高度增大,超声速流动区域从尾缘向前缘扩展,顶部换热系数先减小后增大。叶顶间隙高度的增大使得马蹄涡向吸力面侧移动,从而改变叶顶前缘附近换热系数分布;泄漏流在间隙区域急剧加速使得湍流水平显著降低,而进口湍流强度变化对于叶顶换热影响很小,但进口湍流强度增大时叶顶前缘吸力面侧二次流减弱。
[Abstract]:In order to solve the problem of high speed leakage and complex flow in tip clearance, the flow and heat transfer characteristics at the top of turbine blade under transonic flow are studied by solving the three dimensional Reynolds-Averaged NavierStokes (RANS) and S-A turbulence models. The effects of tip clearance height and inlet turbulence intensity on the heat transfer characteristics of the top flow are also calculated and analyzed. The results show that when the tip clearance is 0.188% moving blade height (small clearance), the gap leakage flow is subsonic (0.3Ma0.8) and has the largest tip heat transfer coefficient, and when the tip clearance height increases to 0.75%, There is supersonic flow (1.0Ma1.3) in the interstitial leakage flow, and the average heat transfer coefficient at the top of the blade is the smallest. With the increase of the clearance height, the supersonic flow region extends from the front edge of the tail edge, and the heat transfer coefficient at the top decreases first and then increases. With the increase of the height of the tip clearance, the horseshoe vortex moves to the suction side, thus changing the distribution of heat transfer coefficient near the front edge of the tip of the blade, and the leakage flow accelerates sharply in the gap region, and the turbulent level decreases significantly. But the change of inlet turbulence intensity has little effect on the heat transfer at the top of the blade, but the secondary flow on the suction surface of the front edge of the blade tip weakens with the increase of the inlet turbulence intensity.
【作者单位】： 西安交通大学能源与动力工程学院;先进航空发动机协同创新中心;
【基金】：国家自然科学基金资助项目(51376144)
【分类号】：TK471
[Abstract]:In order to solve the problem of high speed leakage and complex flow in tip clearance, the flow and heat transfer characteristics at the top of turbine blade under transonic flow are studied by solving the three dimensional Reynolds-Averaged NavierStokes (RANS) and S-A turbulence models. The effects of tip clearance height and inlet turbulence intensity on the heat transfer characteristics of the top flow are also calculated and analyzed. The results show that when the tip clearance is 0.188% moving blade height (small clearance), the gap leakage flow is subsonic (0.3Ma0.8) and has the largest tip heat transfer coefficient, and when the tip clearance height increases to 0.75%, There is supersonic flow (1.0Ma1.3) in the interstitial leakage flow, and the average heat transfer coefficient at the top of the blade is the smallest. With the increase of the clearance height, the supersonic flow region extends from the front edge of the tail edge, and the heat transfer coefficient at the top decreases first and then increases. With the increase of the height of the tip clearance, the horseshoe vortex moves to the suction side, thus changing the distribution of heat transfer coefficient near the front edge of the tip of the blade, and the leakage flow accelerates sharply in the gap region, and the turbulent level decreases significantly. But the change of inlet turbulence intensity has little effect on the heat transfer at the top of the blade, but the secondary flow on the suction surface of the front edge of the blade tip weakens with the increase of the inlet turbulence intensity.
【作者单位】： 西安交通大学能源与动力工程学院;先进航空发动机协同创新中心;
【基金】：国家自然科学基金资助项目(51376144)
【分类号】：TK471
【相似文献】
相关期刊论文 前10条
1 刘蕾;肖泽军;闫晓;曾小康;黄彦平;;超临界水流动传热特性影响因素数值模拟研究[J];核动力工程;2013年01期
2 杨红卫;多重介质流动传热的数值模拟[J];北京工商大学学报(自然科学版);2001年03期
3 顾汉洋;程旭;杨燕华;;超临界反应堆子通道流动传热数值分析[J];工程热物理学报;2008年03期
4 鄢炳火;顾汉洋;于雷;;摇摆条件下典型通道间湍流的流动传热特性[J];原子能科学技术;2011年02期
5 晏鑫;李军;丰镇平;;蜂窝密封内流动传热及转子动力特性的研究进展[J];力学进展;2011年02期
6 汤珂;唐文涛;张s，
本文编号：2227862
本文链接：https://www.wllwen.com/kejilunwen/dongligc/2227862.html
