Simulation of pulsed injection in a cross flow using 3-D unsteady CFD

Bender, Erich; Miller, Daniel N.; Smith, Brian R.; Yagle, Patrick J.; Vermeulen, P. J.; Walker, S.W.

doi:10.2514/6.2000-2318

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…Binder et. al showed that sinusoidally pulsing an air jet indeed improved penetration over the steady incompressible jet with both experimentation and numerical modelling [8]. Sau and Mahesh used a numerical model to create a map which describes the variation in vortex structure of a pulsed jet in crossflow which strongly depends on blowing ratio, stroke ratio and duty cycle.…”

Section: Background Literaturementioning

confidence: 99%

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Numerical Investigations of Pulsed Fuel Injection into Supersonic Crossflow

Williams

Thompson

Moeller

2015

22nd AIAA Computational Fluid Dynamics Conference

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The investigation of fuel delivery mechanisms is a critical design point in the development of supersonic combustion ramjet (scramjet) technology. Primary challenges include proper penetration of the jet in the supersonic cross-flow while keeping total pressure losses and wall drag to a minimum. To reduce drag and heat loads especially at high burner entry Mach numbers it is desirable to use a non-intrusive means of fuel delivery. It has been shown in incompressible studies that excited jets increase penetration into crossflows. Several papers have demonstrated that excited jets increase penetration in supersonic crossflows in comparison to steady jets. This paper presents a cold-flow, 3-D numerical model using ANSYS FLUENT 15.0 has shown that the penetration of a hydrogen jet into a supersonic air stream is increased when pulsing the sonic jet in the kilohertz range of frequencies. Further experimental validation of this work is planned within a Mach 2.3 blow down facility at UTSI (currently under development) which will use a kHz range siren to produce the pulsation jet.

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Section: Background Literaturementioning

confidence: 99%

“…Since then there have been extensive numerical and experimental studies of physical phenomena of excited jets in subsonic crossflows [6,8]. These studies have investigated the effects of frequency/Strouhal number, blowing ratio and the momentum flux ratio on penetration characteristics of the jets.…”

Section: Background Literaturementioning

confidence: 99%

Numerical Investigations of Pulsed Fuel Injection into Supersonic Crossflow

Williams

Thompson

Moeller

2015

22nd AIAA Computational Fluid Dynamics Conference

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“…Subsequently, researchers have made significant progress in obtaining accurate flow field structures and parameter distributions through the use of sophisticated numerical methods and models. These advancements in numerical simulations have also led to the development of various forms of secondary injection that cater to specific engineering requirements, such as pulsed jet [31][32][33], gas-solid two-phase injection [34][35][36], and liquid secondary injection [37][38][39][40]. Numerous scholars have conducted research and analysis on liquid secondary injection.…”

Section: Advancements In Secondary Jet Researchmentioning

confidence: 99%

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Zhu,

Guo,

Sun

et al. 2023

Fluids

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As humans continue to explore the aerospace field, higher demands have been placed on new types of propulsion systems. Meanwhile, active secondary flow has been applied to various aspects of engines over the past seventy years, significantly enhancing engine performance. For the new generation of propulsion systems, active secondary flow remains a highly promising technology. This article provides an overview of the application of active secondary flow in engines, including a review of the past research on the secondary jet flow field, and an introduction of the more prominent applications of the jet in engines and its research progress. Finally, the problems existing in the current application of the secondary jet are summarized, and the future direction of the research is anticipated.

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Dynamics and Control of an Isolated Jet in Crossflow

Narayanan¹,

Barooah

Cohen

2003

AIAA Journal

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Experimental results from a systematic exploration of the dynamics and control of large-scale, organized structures in an isolated, circular jet issuing into a uniform cross ow with a jet-to-cross ow velocity (or blowing) ratio of 6 are presented. Surveys of the unsteady ow eld were conducted using a single sensor hot-lm probe, and the instantaneous and time-averaged scalar elds were explored using Mie scattering-based ow visualization. A spinning mechanical valve was used to modulate the jet ow with a single frequency. The forced ow response illustrates the ow receptivity to high frequencies near the jet exit (associated with the jet instabilities) and to low frequencies farther downstream (where the counter-rotating vortex pair dynamics are dominant). Open-loop forcing in a jet Strouhal number around Sr D = 0.1 was recognized and demonstrated to be effective in organizing unsteadiness and enhancing mixing and entrainment in the ow eld. Measurements of the time-averaged velocity and scalar elds are used to demonstrate increased mass entrainment and mixing as a result of the unsteady forcing. Nomenclature A = cross-sectional area of channel, m 2 D j = diameter of jet nozzle, m f = frequency, Hz h = channel height, m l = ow structure length scale, m Re = Reynolds number, (U D j =º) r = velocity ratio, (U j =U 1 ) Sr D = Strouhal number, identical to f D j =U U = local mean velocity, m/s U j = jet exit velocity, m/s U 1 = cross ow velocity, m/s u 0= local turbulence intensity, m/s x = axial distance, 0 at jet centerline y = vertical distance, 0 at jet injection wall z = spanwise distance in channel, 0 at center ± = boundary-layer thickness on channel horizontal wall, m º = kinematic viscosity for air, m 2 /s ½ = density of air at room temperature, kg/m 3

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Simulation of pulsed injection in a cross flow using 3-D unsteady CFD

Cited by 10 publications

References 6 publications

Numerical Investigations of Pulsed Fuel Injection into Supersonic Crossflow

Numerical Investigations of Pulsed Fuel Injection into Supersonic Crossflow

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Dynamics and Control of an Isolated Jet in Crossflow

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