当前位置: X-MOL 学术Renew. Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Dynamic mode decomposition and reconstruction of tip leakage vortex in a mixed flow pump as turbine at pump mode
Renewable Energy ( IF 8.7 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.renene.2020.03.142
Yadong Han , Lei Tan

Abstract In the present work, the tip leakage vortex (TLV) in a mixed flow pump as turbine at pump mode is decomposed and reconstructed by Dynamic Mode Decomposition (DMD) for the first time. The flow field is solved by the k-ω SST turbulence model with validation of experimental data. The unstable primary tip leakage vortex (PTLV) can be mainly classified as two parts, oscillating PTLV-A and shedding PTLV-B. The evolution frequency of PTLV is 8.4fi (fi is the impeller rotating frequency). Results of DMD show that DMD can exactly decompose the dominant frequency of TLV evolution and its harmonic frequencies. The coherent structures captured by DMD mainly distribute near the trajectory of PTLV. Meanwhile, DMD can successfully reconstruct the flow field on basis of mean flow mode and the first mode. Proper Orthogonal Decomposition (POD) can also capture the main coherent structures of PTLV, due to the dominant frequencies of the most energetic modes contain the characteristic frequency of TLV.

中文翻译:

混流泵涡轮泵模式下叶尖泄漏涡的动态模态分解与重构

摘要 在目前的工作中,首次采用动态模态分解(DMD)方法对混流泵作为涡轮泵模式下的叶尖泄漏涡(TLV)进行了分解和重构。流场由 k-ω SST 湍流模型求解,并验证了实验数据。不稳定的初级叶尖泄漏涡流 (PTLV) 主要可分为两部分,振荡 PTLV-A 和脱落 PTLV-B。PTLV的演化频率为8.4fi(fi为叶轮旋转频率)。DMD结果表明DMD能够准确分解TLV演化的主频及其谐波频率。DMD 捕获的相干结构主要分布在 PTLV 的轨迹附近。同时,DMD可以在平均流模式和第一模式的基础上成功地重建流场。
更新日期:2020-08-01
down
wechat
bug