Experiments of the vortical structure morphology in a tip clearance flow

LIU Yuwen; XU Lianghao; ZHANG Guoping; LIU Jianhua; PENG Xiaoxing

doi:10.7638/kqdlxxb-2020.0168

English Version Journal Login

您当前的位置：

首页 >

文章列表页 >

Experiments of the vortical structure morphology in a tip clearance flow

更新时间：2026-05-28

- Experiments of the vortical structure morphology in a tip clearance flow
- Vol. 40, Issue 1, Pages: 57-64(2022)
- 作者机构：
  
  中国船舶科学研究中心振动与噪声国家重点实验室,无锡,214082
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2020.0168
  CLC： TV131.3+2
- Published：2022
- 稿件说明：
移动端阅览
刘玉文, 徐良浩, 张国平, 等. 叶顶间隙流动中的涡结构实验研究[J]. 空气动力学学报, 2022, 40(1): 57−64.

LIU Yuwen, XU Lianghao, ZHANG Guoping, et al. Experiments of the vortical structure morphology in a tip clearance flow[J]. 2022, 40(1): 57-64.
刘玉文, 徐良浩, 张国平, 等. 叶顶间隙流动中的涡结构实验研究[J]. 空气动力学学报, 2022, 40(1): 57−64. DOI： 10.7638/kqdlxxb-2020.0168

LIU Yuwen, XU Lianghao, ZHANG Guoping, et al. Experiments of the vortical structure morphology in a tip clearance flow[J]. 2022, 40(1): 57-64. DOI： 10.7638/kqdlxxb-2020.0168.

摘要

叶顶间隙流动中的旋涡结构是引发导管桨、水轮机等水力机械叶顶间隙空化问题的主要因素之一。与常规船用螺旋桨（叶顶无端壁）上的梢涡流动不同，叶顶间隙流动受叶片载荷分布和间隙尺度（叶片梢部与端壁的距离）共同作用。为了研究叶顶间隙流动中的旋涡结构特性及其影响因素作用机理，本文采用二维NACA0024翼型在空泡机理水筒中，开展了基于旋涡空化观测的叶顶间隙流动显示实验和基于2D-3C PIV的叶顶间隙流场测量实验。通过空化观测实验，获得了叶顶间隙流动中的旋涡整体分布状态，以及间隙宽度、雷诺数和载荷系数等对旋涡强度的影响规律。通过流场测量实验，获得了局部全湿流场（无空化状态）中的旋涡分布规律以及其随不同影响因素的变化规律。结合流动显示实验和流场测量实验，研究了叶顶间隙流动中的旋涡结构形态以及形成机理，并初步阐明了间隙宽度、雷诺数和载荷系数对叶顶间隙流动旋涡强度的影响规律。研究表明，在NACA0024翼型叶顶间隙流动中存在两种主要稳定涡结构，分别是梢分离涡和梢泄涡；稳定涡结构是引起叶顶间隙流动空化的主要因素；翼型攻角和间隙宽度的大小是影响叶顶间隙流动中旋涡结构强度的主要因素。

Abstract

Vortical structures in tip clearance flow are prone to induce the flow cavitation for hydraulic machineries such as ducted propellers and hydroturbines. Unlike the tip vortical flow in conventional vessel propellers

the tip clearance flow is affected by the load distribution on the blade and the gap size between the blade tip and the end wall. To study the characteristics of vortical structures in tip clearance flow

the visualization by vortex cavitation bubbles and the velocity measurement by 2D-3C PIV are carried out for the NACA0024 straight airfoil in a cavitation tunnel. The global distribution of vortical structures in the tip clearance flow and the influence of gap width

Reynolds number

and load coefficient on the vortex strength are obtained by cavitation observation experiment. In addition

the vortex distribution in local flow fields without cavitation and its variation with different influence factors are obtained by velocity measurement. By combining the flow visualization and velocity measurement results

the morphology of vortical structures and their formation mechanism are analyzed. And the effects of the gap width

Reynolds number

and load coefficient on the vortex strength are illuminated preliminarily. Results show that there are two types of steady vortical structures in the tip clearance flow

i.e.

the tip separated vortex and tip leakage vortex

which are responsible for inducing the cavitation of tip clearance flow. The angle of attack and gap size of the airfoil will affect the strength of vortices in the tip clearance flow significantly.

关键词

Keywords

references

LIU Y B, TAN L, WANG B B. A review of tip clearance in propeller, pump and turbine[J]. Energies, 2018, 11(9): 2202.DOI: 10.3390/en11092202.

ZHANG D S, SHI L, CHEN J, et al. Numerical simulations and visualized experiments of tip leakage vortex and associated cavitation in axial-flow pump[J]. Chinese Journal of Hydrodynamics, 2017, 32(5): 565-574. (in Chinese)DOI: 10.16076/j.cnki.cjhd.2017.05.005.

INOUE M, KUROUMARU M. Structure of tip clearance flow in an isolated axial compressor rotor[J]. Journal of Turbomachinery, 1989, 111(3): 250-256.DOI: 10.1115/1.3262263.

ROUSSOPOULOS K, MONKEWITZ P A. Measurements of tip vortex characteristics and the effect of an anti-cavitation lip on a model kaplan turbine blade[J]. Flow, Turbulence and Combustion, 2000, 64(2): 119-144.DOI: 10.1023/A:1009976411156.

MIORINI R L, WU H X, KATZ J. The internal structure of the tip leakage vortex within the rotor of an axial waterjet pump[J]. Journal of Turbomachinery, 2012, 134(3): 031018.DOI: 10.1115/1.4003065.

YOU D, WANG M, MOIN P, et al. Vortex dynamics and low-pressure fluctuations in the tip-clearance flow[J]. Journal of Fluids Engineering, 2007, 129(8): 1002-1014.DOI: 10.1115/1.2746911.

YOU D, WANG M, MOIN P, et al. Effects of tip-gap size on the tip-leakage flow in a turbomachinery cascade[J]. Physics of Fluids, 2006, 18(10): 105102.DOI: 10.1063/1.2354544.

YOU D, MITTAL R, WANG M, et al. Computational methodology for large-eddy simulation of tip-clearance flows[J]. AIAA Journal, 2004, 42(2): 271-279.DOI: 10.2514/1.2626.

YOU D, WANG M, MOIN P, et al. Large-eddy simulation analysis of mechanisms for viscous losses in a turbomachinery tip-clearance flow[J]. Journal of Fluid Mechanics, 2007, 586: 177-204.DOI: 10.1017/s0022112007006842.

MUTHANNA C, DEVENPORT W J. Wake of a compressor cascade with tip gap, part 1: mean flow and turbulence structure[J]. AIAA Journal, 2004, 42(11): 2320-2331.DOI: 10.2514/1.5270.

WENGER C W, DEVENPORT W J, WITTMER K S, et al. Wake of a compressor cascade with tip gap, part 3: two point statistics[J]. AIAA Journal, 2004, 42(11): 2341-2346.DOI: 10.2514/1.842.

DREYER M, DECAIX J, MÜNCH C, et al. Mind the gap: Tip leakage vortex dynamics and cavitation in axial turbines[C ] //27th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2014). IOP Conf. Series: Earth and Environmental Science, 2014, 22: 052023.doi: 10.5075/epfl-thesis-6611

LIU Y W, XU L H, ZHANG G P, et al. Observation and research on the cavitation inception and cavitation structure of tip leakage flow[J]. Chinese Journal of Hydrodynamics, 2017, 32(6): 671-679. (in Chinese).

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Impact of inter-wing spacing on aerodynamic noise in multi-flapping wing configurations

An Ac-criteria-based optimal input design method

Research progress on noise reduction of centrifugal fans

Research on the characteristics of water droplets impacting moving superhydrophobic surfaces and its regulation

Multi-factor analysis and simulation of particle erosion characteristics of fan blades

Related Author

No data

Related Institution

No data

AI问答

⁰