文献类型：期刊文献

英文题名：An Experimental PIV/POD Study on the Sequentially Coupled Flow Field of Swirl and Multiple Jets

作者：Dong, Qingqing Chen, Jian

第一作者：Dong, Qingqing

通信作者：Chen, J[1];Chen, J[2]

机构：[1]Guizhou Inst Technol, Sch Aerosp Engn, Guiyang, Peoples R China;[2]Guizhou Sci & Technol Innovat Leading Talent Stn A, Guiyang, Peoples R China;[3]Guizhou Inst Technol, Key Lab Aeroengine Thermal Management & Intelligen, Guiyang, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Aerosp Engn, Guiyang, Peoples R China;corresponding author), Guizhou Inst Technol, Key Lab Aeroengine Thermal Management & Intelligen, Guiyang, Peoples R China.|贵州理工学院;

年份：2026

卷号：2026

期号：1

外文期刊名：INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING

收录：;Scopus(收录号：2-s2.0-105041191296);WOS:【SCI-EXPANDED(收录号:WOS:001787783300001)】；

基金：This work was supported by the Natural Science Foundation of Guizhou Province (No. MS [2026]-242), the National Natural Science Foundation of China (No. 52166006), and the Research Initiation Project for High-Level Talents at Guizhou Institute of Technology (No. 2023GCC016).

语种：英文

外文关键词：flow reconstruction; particle image velocimetry (PIV); proper orthogonal decomposition (POD); recirculation zone; swirl flow

摘要：The stepwise flow reconstruction induced by sequential coupling of swirl, primary jets, and dilution jets was experimentally investigated in a model combustor using high-speed PIV and proper orthogonal decomposition (POD). Three nonreacting configurations were compared: pure swirl, swirl plus primary jets, and swirl with both primary and dilution jets. The primary jets intensified the upstream central recirculation zone, increasing the peak reverse velocity at X = 30 mm by approximately 100% (from U/Ub = -0.50 to -1.0), with the subsequent dilution jets further amplifying it to -1.25. The primary jets also axially stretched the recirculation zone and weakened its downstream core velocity by approximately 50% (to U/Ub = -0.25). The dilution jets dominated the far downstream region, reversing the centerline velocity from negative to a positive value of U/Ub = +0.38 at X = 90 mm and eliminating reverse flow, thereby reshaping the flow into a quasiunidirectional pattern. POD analysis revealed that multijet coupling shifted the dominant dynamics from a low-frequency quasiperiodic mode (1.65 Hz) under pure swirl to a higher frequency instability (2.4 Hz) excited by the primary jets. The pure swirl field already exhibited multifrequency behavior, but the primary jets systematically increased the characteristic frequency of the most energetic coherent structure. Spectral energy accumulation was noted near the Nyquist limit (7.5 Hz); however, given the 15 Hz sampling rate, these features are subject to aliasing and are interpreted only as qualitative indicators of unresolved higher frequency activity rather than as definitively identified modal dynamics. The primary jets concentrated turbulent energy in large-scale structures (Mode 1 energy fraction reached 12.84%), whereas the dilution jets promoted energy redistribution across a broader range of scales, facilitating the transition toward a more fully developed turbulent state with a more uniform spectral energy distribution.