| 叶尖间隙控制系统供气部件特性及模拟方法 |
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| 引用本文： | 王海,毛军逵,刘方圆,陆海鹰,柴军生.叶尖间隙控制系统供气部件特性及模拟方法[J].航空动力学报,2017,32(4):932-941. |
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| 作者姓名： | 王海 毛军逵 刘方圆 陆海鹰 柴军生 |
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| 作者单位： | 1.中国航空发动机集团有限公司 沈阳发动机研究所, 沈阳 110015 |
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| 摘 要： | 针对低压涡轮叶尖间隙控制系统中典型供气管路，即圆形截面90°弯曲冷却管，开展其工作特性和模拟方法研究.通过1∶1单管模型试验结合三维数值模拟方法，研究了冷却管上冲击孔的出流特性，分析了进气参数、冲击孔排布对冷却管内气体流动及流量分配的影响规律.在此基础上，提出了基于冲击孔进口有效总压概念的冷却管一维网络流动计算模型，建立了低压涡轮叶尖间隙系统中典型供气管路的一维网络流动计算方法，并应用于某型发动机组件流量特性试验设计中.研究中发现，随着远离进口位置，冷却管冲击孔出流流量和冲击孔流量系数逐步增加；随着进口雷诺数的增加，冷却管内冲击孔出流流量均有所增加，而冲击孔流量系数基本保持不变.试验数据和计算结果比对表明，所建立的一维网络流动计算模型可以准确模拟出冷却管的出流特性，计算结果同组件流量特性试验数据之间最大相对误差为4.5%，在叶尖间隙控制系统这类系统复杂流路的流动问题分析中具有良好的应用效果.
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| 关 键 词： | 叶尖间隙控制 冷却管 流动特性 冲击孔 一维网络流动计算模型 |
| 收稿时间： | 2016/3/26 0:00:00 |
Simulation and characteristics of the coolant feeding tubes in tip clearance control system |
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| Abstract: | Typical coolant feeding tubes of low pressure turbine tip clearance control system were numerically and experimentally investigated with three-dimensional calculations and full size experimental section,i.e.90° curved round-section coolant feeding tubes.The outflow characteristic of impingement holes on coolant feeding tubes was studied,and the in let parameters,arrangement of impingement holes were changed to examine the rules of inner flow and flow rate distribution of coolant feeding tubes.The effective inlet total pressure of impingement holes was defined,then one-dimensional flow net caculation model was established according to this new assumption.Finally the assemblies of coolant feeding tubes of low pressure turbine tip clearance control system were studied by this one-dimensional flow net model and experiments.It was found that with the increase of central angle,the outflow rate and the discharge coefficient increased.The outflow rate through the coolant feeding tube increased with the increasing of inlet Reynolds number,however the discharge coefficients of the impingement hole remained consistent.The comparison between numerical results and experimental data indicates that reasonable flow characteristics of the coolant feeding tubes can be obtained by the one-dimensional flow net model.The maximum relative error between calculation results and experiment data is 4.5 ％.All the results show that the one-dimensional flow net model has a reasonable accuracy and good application in the complex fluid nets like the tip clearance control system. |
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| Keywords: | tip clearance control coolant feeding tubes flow characteristics impingement holes one-dimensional flow net model |
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