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Investigation of mixing characteristics and flow physics induced by spanwise tandem injection in supersonic crossflow

Spandan Maikap and Arun Kumar R.*

  • *Contact author: arunkr@iitj.ac.in
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Phys. Rev. Fluids 9, 093401 – Published 26 September, 2024

DOI: https://doi.org/10.1103/PhysRevFluids.9.093401

Abstract

This study explores the flow physics and mixing characteristics produced by the interaction of two transversally injected jets along the spanwise direction with a supersonic crossflow using experimental and numerical techniques. Results show that smaller interjet spacing reduces the crossflow entrainment from the top into the interjet region, while wider spacing facilitates greater entrainment. The investigation further reveals that the gap created by the two injected jets allows the crossflow to decelerate and then accelerate to a higher supersonic Mach number as it flows along the interjet region. Investigation of the shock structures revealed that in the case of smaller interjet spacing, the strong part of the two bow shocks created by the transverse jets interacts with each other, whereas with large interjet spacing, the weak part of the two bow shock waves interacts. This leads to a larger local pressure jump in the interjet spacing with a smaller injector gap than the larger one. Various streamwise vortices, such as horseshoe and counter-rotating vortex pairs (CVPs), are seen to form for spanwise tandem injection in crossflow. The interaction of such vortices is seen to be significant in the case with smaller injector spacing compared to the larger one. The oil flow visualization reveals the formation of a herringbone-shaped separation region in the wake of the jets, and the size of this separation zone diminishes with the reduction in injector spacing. The mixing characteristics investigated using Mie scattering and computations reveal that with an increase in injector spacing, the mixing efficiency increases.

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Outline

Information

Phys. Rev. Fluids 9, 093401– Published 26 September, 2024
  • Received 1 April 2024
  • Accepted 10 September 2024
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