不同叶顶弯曲对离心叶轮性能影响机理
Influence mechanism of different tip curvatures on the performance of tip-leaned centrifugal impellers
王忠义 1曲锋 2钟新权 3王艳华 1连柽煜1
作者信息
- 1. 哈尔滨工程大学 动力与能源工程学院,黑龙江 哈尔滨 150001
- 2. 哈尔滨工程大学 动力与能源工程学院,黑龙江 哈尔滨 150001;中国船舶集团有限公司第七〇三研究所,黑龙江 哈尔滨 150010
- 3. 中船黄埔文冲船舶有限公司,广东 广州 510715
- 折叠
摘要
面对现代发动机对离心叶轮性能需求不断提高的背景,叶顶弯曲具备有效改善离心叶轮气动特性的能力,本文通过数值模拟的方式对不同叶顶弯曲方向、弯曲形式、弯曲程度的压气机性能进行预测,基于仿真结果对不同流动状态下压气机内部流场进行分析,给出了叶顶弯曲压气机性能变化机理.结果显示:负弯叶轮有助于提升压气机峰值效率,提高压气机堵塞流量.正弯叶轮则在损失部分效率的情况下,使压气机失速裕度得到提升.弯曲叶轮主要通过改善叶顶前缘载荷,重构叶轮通道内静压分布,从而削弱激波强度、减少二次流损失、抑制低能涡发展,达到提升压气机性能的目的.本文研究结果可为离心压气机叶片改型设计提供参考.
Abstract
Confronted with the rising demand for enhanced performance in modern engine centrifugal impellers,tip-leaned centrifugal impellers have shown the ability to effectively improve aerodynamic efficiency.This paper utilizes numerical simulations to predict the performance of compressors with varying curvature directions,types,and de-grees.Based on these simulations,the flow field within the compressor under different flow conditions is analyzed to understand the performance changes in blade tip-leaned compressors.The results indicate that a negative leaned im-peller increases both the peak efficiency and choke flow rate of the compressor.On the contrary,a positive leaned impeller enhances the stall margin,though it sacrifices some efficiency.In tip-leaned impellers,the static pressure distribution within the blade passage is optimized by improving the load at the leading edge of the blade tip.This ad-justment weakens shock wave intensity,reduces secondary flow losses,and inhibits the development of low-energy vortices.These findings provide valuable insights for the modification design of centrifugal compressor blades.
关键词
弯叶片/离心叶轮/数值模拟/性能预测/优化设计/二次流/失速裕度/附面层Key words
leaned blade/centrifugal impeller/numerical simulation/performance prediction/optimization design/secondary flow/stall margin/boundary layer引用本文复制引用
基金项目
黑龙江省优秀青年基金项目(YQ2019E015)
出版年
2024
国家科技期刊平台
NSTL
万方数据