摘要
膨胀机转子的叶片角分布对其流动特性有很大影响,膨胀机在运行过程中,根据工况选择合适的叶片角,可以有效提高整体性能,改善各流动参数在膨胀机中的分布情况,减少流动损失,扩大工作范围。本文利用CFD软件对膨胀机转子模型进行了三维数值模拟与分析,对转子前后缘叶片角多参数模拟。研究表明:当转子前缘叶片角偏大或者偏小时,叶片前缘与介质来流方向差异过大,增加了转子进口的入射损失。转子前缘叶片角会影响转子与导叶交汇区域流体流动,与设计工况不匹配的叶片角不利于流场分布,增加流场能量损耗并产生涡流,同时前缘叶片角对膨胀机效率的影响比后缘叶片角明显。在本文的设计与工况条件下,最佳的前缘叶片角大约为110°。
The blade angle distribution of the expander rotor has a great influence on the flow characteristics of expander.Selecting the appropriate blade angle according to the working conditions can effectively improve the overall performance,and the distribution of each flow parameter in the expander,reduce the flow loss and expand the working range.In this paper,a three-dimensional numerical simulation and analysis of the rotor model of the expander is carried out using CFD software to simulate the multi-parameter rotor blade angle at the leading and trailing edges.The study shows that when the rotor leading edge blade angle is large or small,the difference between the leading edge of the blade and the incoming flow direction of the medium is too large,which increases the incident loss at the rotor inlet.The rotor leading edge blade angle will affect the fluid flow of rotor and guide vane meeting area.The blade angle does not match the design condition will not conducive to the flow field increase the flow field energy loss,resulting in vortex,while the impact of leading edge blade angle on the expander is more obvious than the trailing edge blade angle.In the design and working conditions of this paper,the best leading edge blade angle is about 110°.
作者
张雁兴
潘玉华
李宝宽
Yan-xing Zhang;Yu-hua Pan;Bao-kuan Li(University of Science and Technology Liaoning;Northeastern University)
出处
《风机技术》
2022年第1期17-27,共11页
Chinese Journal of Turbomachinery
基金
国家自然科学基金资助项目(51934002)。
关键词
数值模拟
涡轮膨胀机
叶片角
Numerical Simulation
Expander
Blade Angle
