Flowfield Analysis of Linear Plug Nozzle

Chutkey, Kiran; Vasudevan, Balamurali; Balakrishnan, N.

doi:10.2514/1.60915

Cited by 2 publications

(6 citation statements)

References 16 publications

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“…Figure 48 shows that base pressure is nonuniform with radius and is generally less than atmospheric pressure. These somewhat inaccurate results are consistent with those found in the literature ( [33], [34], [38]).…”

Section: Steady-state Base Pressure Distributionsupporting

confidence: 92%

“…The open wake regime is sometimes further classified into type 1 and type 2 flows based on the location of the expansion fan along the plug contour [33], [34], [35].…”

Section: The Open Wake Regimementioning

confidence: 99%

“…Nasuti, Onofri, and Chutkey et al [21], [27], [33], [34], [37] independently present detailed engineering models for prediction of transition between wake states in both still air and supersonic flow. Essentially, the wake is said to be closed if the last characteristic wave of the expansion fan centered at the nozzle lip impinges on the wake downstream of the reattachment point [21].…”

Section: Open/closed Transitionmentioning

confidence: 99%

“…It is important to note that open wake operation does not guarantee that base pressure will be equal to the local ambient pressure. Rather, operation in the open wake regime just indicates that base pressure varies in the radial direction about the ambient pressure value, depending on the prevailing pressure at the plug lip, which in turn depends on the nature of the wave interactions at lower pressure ratios [34], [33]. For annular plug nozzles in the open wake regime, base pressure has been shown to vary about the atmospheric pressure value, while for the linear plug case, the open wake base pressure can be reasonably approximated to atmospheric pressures [21], [34].…”

Section: A Open Wake Base Pressure Predictionmentioning

confidence: 99%

“…The limitations of present day computational tools in computing plug nozzle base flows is well documented [34], [38]. While CFD has been shown to adequately predict the pressure ratio at which open/closed wake transition occurs, it tends to grossly underpredict the base pressure for most pressure ratios [33], [34]. Furthermore, CFD has been shown to predict a nonuniform base pressure, whereas experimental base pressure is fairly uniform with radius [34].…”

Section: Cfd Predictionsmentioning

confidence: 99%

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Pressure Distribution and Performance Impacts of Aerospike Nozzles on Rotating Detonation Engines

Schnabel

2018

2018 AIAA Aerospace Sciences Meeting

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Section: Steady-state Base Pressure Distributionsupporting

confidence: 92%

“…The open wake regime is sometimes further classified into type 1 and type 2 flows based on the location of the expansion fan along the plug contour [33], [34], [35].…”

Section: The Open Wake Regimementioning

confidence: 99%

Section: Open/closed Transitionmentioning

confidence: 99%

Section: A Open Wake Base Pressure Predictionmentioning

confidence: 99%

Section: Cfd Predictionsmentioning

confidence: 99%

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Pressure Distribution and Performance Impacts of Aerospike Nozzles on Rotating Detonation Engines

Schnabel

2018

2018 AIAA Aerospace Sciences Meeting

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On the unsteady dynamics of partially shrouded compressible jets

et al. 2021

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We experimentally investigate a partially shrouded sonic jet exiting from a planar nozzle with a solid wall on one side at two different nozzle pressure ratio (ζ = 4 and 5). We experimentally show for the first time that the inherent jet unsteadiness from the shock-induced flow separation on the wall and the emitted noise in the far-field is strongly coupled. The partially shrouded jet's lateral free expansion is also identified to be complicated, three-dimensional, and the produced noise is directional. The emitted acoustic pulses from the flapping-jet, the radiated noise from the shock-induced separation on the wall, and the shock-shear layer interaction on the other side of the wall are responsible for the generated acoustic disturbances. The non-uniform aeroacoustic forcing on the top and bottom portion of the partially wall-bounded jet shear layer leads to a self-sustained jet oscillation and a discrete sound emission.

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Flowfield Analysis of Linear Plug Nozzle

Cited by 2 publications

References 16 publications

Pressure Distribution and Performance Impacts of Aerospike Nozzles on Rotating Detonation Engines

Pressure Distribution and Performance Impacts of Aerospike Nozzles on Rotating Detonation Engines

On the unsteady dynamics of partially shrouded compressible jets

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