Underexpanded Jet Development from a Rectangular Nozzle with Aft-Deck

Behrouzi, Parviz; McGuirk, James J.

doi:10.2514/1.j053376

Cited by 47 publications

(11 citation statements)

References 25 publications

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“…In contrast, the jet boundary of the elliptic and rectangular jets in the major axis plane shrinks at first, and then expands along the streamwise direction. This behavior is mainly contributed to the axis switching effect that has been previously observed in the noncircular jets, including the square [13,14,29], elliptic [10][11][12], and rectangular jets [18,19]. Generally, the axis switching angle for the square jet is 45 deg, but takes a value of 90 deg for the elliptic and rectangular jets.…”

Section: Quasi-steady State Jetsmentioning

confidence: 79%

“…Gutmark et al [15] and Raman [16,17] concentrated on studies of the acoustic properties and shock structures in underexpanded rectangular jets. Behrouzi and Mcguirk [18] investigated the flow development in supersonic underexpanded jets issuing from a rectangular nozzle using schlieren visualization, pitot probe, and laser doppler anemometry measurements. Valentich et al [19] examined the mixing characteristics of a moderate aspect ratio supersonic rectangular jet using PIV measurements.…”

Section: Introductionmentioning

confidence: 99%

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Flow characteristic of highly underexpanded jets from various nozzle geometries

Zhou

Yao

et al. 2017

Applied Thermal Engineering

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Section: Quasi-steady State Jetsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Flow characteristic of highly underexpanded jets from various nozzle geometries

Zhou

Yao

et al. 2017

Applied Thermal Engineering

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“…Rectangular cross-section nozzles have been a topic of interest for many researchers, dating back to the early 1990s [1][2][3][4][5], and recently [6][7][8][9][10][11][12][13][14][15][16][17]. Low noise emissions, enhanced mixing and thrust vectoring are some of the benefits of rectangular nozzles [2][3][4]9].…”

Section: Introductionmentioning

confidence: 99%

“…Low noise emissions, enhanced mixing and thrust vectoring are some of the benefits of rectangular nozzles [2][3][4]9]. Along with experimental data, computational fluid dynamics (CFD) simulations of nozzles are also becoming more mainstream [16][17][18] in the design-analysis process. Some of the previous literature focused on comparing the rectangular nozzles to their circular counterparts in terms of noise characteristics using large eddy simulations (LES) [9].…”

Section: Introductionmentioning

confidence: 99%

Aspect Ratio Driven Relationship between Nozzle Internal Flow and Supersonic Jet Mixing

2021

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This work attempts to connect internal flow to the exit flow and supersonic jet mixing in rectangular nozzles with low to high aspect ratios (AR). A series of low and high aspect ratio rectangular nozzles (design Mach number = 1.5) with sharp throats are numerically investigated using steady state Reynolds-averaged Navier−Stokes (RANS) computational fluid dynamics (CFD) with k-omega shear stress transport (SST) turbulence model. The numerical shadowgraph reveals stronger shocks at low ARs which become weaker with increasing AR due to less flow turning at the throat. Stronger shocks cause more aggressive gradients in the boundary layer resulting in higher wall shear stresses at the throat for low ARs. The boundary layer becomes thick at low ARs creating more aerodynamic blockage. The boundary layer exiting the nozzle transforms into a shear layer and grows thicker in the high AR nozzle with a smaller potential core length. The variation in the boundary layer growth on the minor and major axis is explained and its growth downstream the throat has a significant role in nozzle exit flow characteristics. The loss mechanism throughout the flow is shown as the entropy generated due to viscous dissipation and accounts for supersonic jet mixing. Axis switching phenomenon is also addressed by analyzing the streamwise vorticity fields at various locations downstream from the nozzle exit.

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“…In addition, the turbulence characteristics of such jet flows and their impact on jet noise have also been studied both numerically and experimentally [10]. Most recently, Behrouzi and McGuirk [11] carried out an experimental study to reveal the behavior of an underexpanded rectangular supersonic jet flow with a very high aspect ratio near 7.4. They showed that the presence of an aft-deck at the nozzle exit had a strong effect on jet development and it reduced turbulence levels in the near fields of the jet.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Characteristics of Rectangular Supersonic Jet on a Flat Plate

Kwak¹,

Lee²

2016

International Journal of Aeronautical and Space Sciences

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The present study focuses on the characteristics of a supersonic jet flowing from a rectangular nozzle exit on a flat plate. Flow visualization techniques using schlieren and kerosene-lampblack tracing are utilized to investigate shock reflection structures and boundary-layer separations over a flat plate. Wall pressure measurements are also carried out to quantitatively analyze the flow structures. All observations are repeated for multiple jet flow boundary conditions by varying the flap length and nozzle pressure ratio. The experimental results show that the jet flow structures over the flat plate are highly three-dimensional with strong bleeding flows from the plate sides, and that they are sensitive to plate length and nozzle pressure ratio. A multicomponent force measurement device is also utilized to observe the characteristics of the jet flow thrust vectoring over the plate. The maximum thrust deflection angle of the jet is about 8°, demonstrating the applicability of thrust vector control via a flat plate installed at the nozzle exit.

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Underexpanded Jet Development from a Rectangular Nozzle with Aft-Deck

Cited by 47 publications

References 25 publications

Flow characteristic of highly underexpanded jets from various nozzle geometries

Flow characteristic of highly underexpanded jets from various nozzle geometries

Aspect Ratio Driven Relationship between Nozzle Internal Flow and Supersonic Jet Mixing

An Experimental Study on the Characteristics of Rectangular Supersonic Jet on a Flat Plate

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