Experimental Research on Flow Field Within the Tip Clearance in Planar Cascades Using PIV

LIAO Zhihong; XUE Zhiliang; FAN Yuqi; ZHOU Yonggang; WU Xuecheng

doi:10.19805/j.cnki.jcspe.2025.240495

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Experimental Research on Flow Field Within the Tip Clearance in Planar Cascades Using PIV

更新时间：2025-11-28

- Experimental Research on Flow Field Within the Tip Clearance in Planar Cascades Using PIV
- Chinese Journal of Power Engineering Vol. 45, Issue 9, Pages: 1387-1395(2025)
- 作者机构：
  
  1. 浙江大学能源高效清洁利用全国重点实验室,浙江,杭州,310027
  2. 浙江大学嘉兴研究院,浙江,嘉兴,314000
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240495
  CLC：
- Published Online：16 September 2025，
  
  Published：2025
- 稿件说明：
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廖志弘,薛志亮,樊雨骐,周永刚,吴学成. 平面叶栅叶顶间隙流场的PIV实验研究动力工程学报, 2025, 45(9): 1387-1395 https://doi.

org/10.19805/j.cnki.jcspe.2025.240495
廖志弘,薛志亮,樊雨骐,周永刚,吴学成. 平面叶栅叶顶间隙流场的PIV实验研究动力工程学报, 2025, 45(9): 1387-1395 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240495.

org/10.19805/j.cnki.jcspe.2025.240495 DOI：

摘要

为研究叶顶间隙内部流场特征

搭建了平面叶栅实验系统

提出了将超声雾化水雾粒子作为示踪粒子、在测量区域上游导流叶栅入口加载示踪粒子的方案

通过数值模拟研究了示踪粒子加载对流场的影响及其加载特性

开展了流场可视化粒子成像测速(particle image velocimetry

PIV)实验

获得了间隙内部速度场图像。结果表明:示踪粒子加载方案满足PIV流场测量要求

能够获得高分辨率的流场图像;在叶顶间隙上、下游存在低速区

内部中、后段存在高速区

随着主流速度的增加

泄漏流速度增加

在下游的低速区越明显

并且随着距离叶顶高度的增加

内部高速区扩大。

Abstract

To investigate the flow field characteristics within tip clearance

a planar cascade experiment system was established. A method was introduced to load ultrasonic atomized water mist particles as tracer particles at the inlet of the upstream guide cascade in measurement area. Through numerical simulations

researches were conducted on the impact of loading tracer particle on flow field

and the characteristics of loading. Flow visualization experiments were carried out by particle image velocimetry (PIV)

so as to obtain velocity field images within clearance. Results indicate that the tracer particle loading method can meet the requirements for PIV flow field measurements

with the acquisition of high resolution flow field images. Low-speed regions exist in the upstream and downstream of the tip clearance

while high-speed regions exist in the middle and rear sections within the tip clearance. With the increase of main flow velocity

the leakage flow velocity increases

which is particularly obvious in the downstream low-speed region. Additionally

with the increase of the height from the tip

the internal high-speed region expands.

关键词

Keywords

references

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