Modal analysis of passive flow control for the turbulent wake of a generic planar space launcher

Loosen, Simon; Statnikov, V.; Meinke, Matthias; Schröder, Wolfgang

doi:10.1007/s12567-017-0183-3

Cited by 4 publications

(5 citation statements)

References 29 publications

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“…The pressure is reduced due to an acceleration in the flow until the lobes' edge and the boat tail. Persistent recompression to the main body's rear is evident further downstream [36].…”

Section: Other Types Of Passive Control Techniquementioning

confidence: 95%

“…The DMD velocity field analysis shows that the lobes can suppress the broad, coherent structure with two-step wavelength measurements in the referral configuration without flow control. The wavelength of the stable structures on the span seems to depend on the lobe geometry, as all spatial DMD modes observed display a periodicity that is equal to the distance between two lobes [36].…”

Section: Other Types Of Passive Control Techniquementioning

confidence: 99%

“…A typical planar space launcher fitted with two passive flow controls simulates a turbulent wake with a zonal RANS-LES system and is studied by dynamic mode decomposition (DMD) [36]. The first approach examines the effect of a conventional boat tail on the surface.…”

Section: Other Types Of Passive Control Techniquementioning

confidence: 99%

“…However, it is shown that that the semi-circular lobes improve the turbulent mixing and creation of the shear layer. Consequently, the attachment length is reduced significantly by around 75% [36]. The semi-circular lobes reduce unwanted differences of low frequency on the top of the nozzle.…”

Section: Other Types Of Passive Control Techniquementioning

confidence: 99%

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Passive Control of Base Pressure: A Review

2021

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In the present world, passive control finds application in various areas like flow over blunt projectiles, missiles, supersonic parallel diffusers (for cruise correction), the engine of jets, static testbeds of rockets, the ports of internal combustion engines, vernier rockets, and single expansion ramp nozzle (SERN) rockets. In this review, various passive control techniques to control the base pressure and regulate the drag force are discussed. In the study, papers ranging from subsonic, sonic, and supersonic flow are discussed. Different types of passive control management techniques like cavity, ribs, dimple, static cylinder, spikes, etc., are discussed in this review article. This study found that the passive control device can control the base pressure, resulting in an enhancement in the base pressure and reducing the base drag. Also, passive control is very efficient whenever there is a favorable pressure gradient at the nozzle exit.

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“…The pressure is reduced due to an acceleration in the flow until the lobes' edge and the boat tail. Persistent recompression to the main body's rear is evident further downstream [36].…”

Section: Other Types Of Passive Control Techniquementioning

confidence: 95%

Section: Other Types Of Passive Control Techniquementioning

confidence: 99%

Section: Other Types Of Passive Control Techniquementioning

confidence: 99%

Section: Other Types Of Passive Control Techniquementioning

confidence: 99%

See 2 more Smart Citations

Passive Control of Base Pressure: A Review

2021

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“…The interaction between the external flow and the structure in the afterbody of a launch vehicle is considered a critical factor. In recent years, many experiments [4,5,11,15,18,31,42,43,49] and computational flow simulations [10,23,28,48,[54][55][56] have focused on the dynamics of the separated / reattached shear layer coming from the end of the main body of a space launcher model. It was shown that the shear layer vortices impinge on the rear end of nozzle fairing for a generic Ariane 5-like geometry.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the base flow of a generic space launcher with dual-bell nozzle

Scharnowski

Kähler

2020

CEAS Space J

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The typical afterbody flow of a space launcher is characterized by a strong interaction of the engine’s exhaust jet and the separated shear layer emerging from the main body. This interaction is further complicated by strong changes in the spatial and temporal behavior of the afterbody flow during the atmospheric ascent of a launcher. Theoretically, a dual-bell nozzle not only allows for a gain in payload compared to standard single-bell nozzles, but also it alters the wake flow topology due to the two nozzle modes. To predict the benefits as well as the additional risks, the afterbody flow of a generic space launcher model equipped with a cold-flow dual-bell nozzle is investigated in detail. The flow was analyzed for sub-, trans- and supersonic Mach numbers ranging from 0.3 to 2.9 for a variety of nozzle pressure ratios. Particle image velocimetry measurements and schlieren measurements with high repetition rate were performed to determine the dynamics of the separated shear layer, the nozzle jet and their interaction. It is shown that the reattachment length of the base flow decreases with increasing nozzle pressure ratio. Furthermore, the nozzle pressure ratio at which the dual-bell nozzle switches from sea-level mode to altitude mode is reduced by $$15\%$$ 15 % with high subsonic outer flow and by as much as $$65\%$$ 65 % for an outer flow at a Mach number of 1.6. Even for a constant nozzle pressure ratio, the nozzle flow topology depends on the Mach number of the outer flow.

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Dynamics of pressure field on axisymmetric backward-facing step: subsonic flows

Vikramaditya

Viji

2023

Exp Fluids

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Modal analysis of passive flow control for the turbulent wake of a generic planar space launcher

Cited by 4 publications

References 29 publications

Passive Control of Base Pressure: A Review

Passive Control of Base Pressure: A Review

Investigation of the base flow of a generic space launcher with dual-bell nozzle

Dynamics of pressure field on axisymmetric backward-facing step: subsonic flows

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