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Scalings and decay of homogeneous, nearly isotropic turbulence behind a jet array

Shiyong Tan, Xu Xu, Yinghe Qi, and Rui Ni*

  • Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, USA

  • *rui.ni@jhu.edu
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Phys. Rev. Fluids 8, 024603 – Published 7 February, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.024603

Abstract

Homogeneous and isotropic turbulence can be generated by many different mechanisms, from classical passive grids to jet arrays. By using high-speed jets, a jet array becomes a promising way to produce intense turbulence with large energy dissipation rates in water and wind tunnels. In this paper, a systematic experimental investigation was conducted to understand how the turbulence decay scales with the jet velocity, nozzle size, and nozzle spacings. Three-dimensional particle tracking was performed to quantify the spatial distribution of different turbulent characteristics. Combined with several previous experiments focusing on near-field measurements, our results provide a clear picture of the decay of the kinetic energy and the energy dissipation rate as well as the development of the inhomogeneity and anisotropy of turbulence generated by a jet array. Suggestions and design considerations for future wind and water tunnels are also provided.

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Outline

Information

Phys. Rev. Fluids 8, 024603– Published 7 February, 2023
  • Received 11 July 2022
  • Accepted 15 December 2022
Article part of CHORUS
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