Numerical study of coupled flow in blocking pulsed jet impinging on a rotating wall

Li Zhang, Chuan Wang, Yingchong Zhang, Wei Xiang, Zhaoming He, Weidong Shi

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In order to study the complex unsteady flow characteristics of pulsed jet impinging on a rotating wall, the Wray–Agarwal turbulence model was adopted. The following conditions were used to simulate the internal flow mechanism, namely: jet with Re = 10,000; rotational speed n = 500 rpm; impinging height H/D = 5; pulse period T = 0.5 s + 0.5 s. The results show that: (1) The flow field structure of pulsed jet impinging the rotating wall is symmetrical about the jet axis. With the development of time, a pair of entrainment vortices and rotating vortices are formed on both sides of the jet and on the rotating wall, respectively. (2) In the vicinity of the jet outlet, the radial distribution of the velocity V gradually becomes non-uniform as time progresses and eventually coincides with the velocity at steady state. (3) During 0 s ≤ t < 0.5 s, the velocity at nozzle-exit increases with time, and the V/Vj along the axis coincides with the steady state. During 0.5 s ≤ t < 1 s, the nozzle-exit velocity V/Vj decreases to 0, along the axis direction, the V/Vj increase first and then decrease. (4) The impact pressure of pulsed jet on the impact wall is greater than that of continuous jet on the impact wall in a certain period when water hammer effect occurs.

Original languageEnglish
Article number508
JournalJournal of the Brazilian Society of Mechanical Sciences and Engineering
Volume43
Issue number11
DOIs
StatePublished - Nov 2021

Keywords

  • Blocking pulsed jet
  • Flow mechanism
  • Numerical simulation
  • Rotating wall

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