On Flow Development in Jet-Driven Vortex Chambers

Jawarneh, Ali M.; Vatistas, Georgios H.; Hong, Henry

doi:10.2514/1.8337

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…In addition, the same parameters are contrasted with those obtained using a chamber with a single generator. 4 It is clear that as the diameter ratio ξ and the Reynolds number R eo increase, the pressure coefficient C p increases for a single and double generators. Stronger vortices will be produced by increasing the diameter ratio and/or Reynolds number, resulting in a higher tangential velocity and hence a higher pressure drop.…”

Section: Analysis Of Resultsmentioning

confidence: 97%

“…Many of these applications are summarized by Gupta et al 1 Two interesting features of the flow of practical importance are the pressure drop and the viscous core size. The pressure drop across a vortex chamber has been the subject of several papers; for example, see Shakespeare and Levy, 2 Escudier et al, 3 and Jawarneh et al 4 These studies have shown that the inlet conditions significantly influence the main flow. Our previous work has focused on chambers with a single vortex generator.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Inlet Conditions on the Pressure Drop in Confined Vortex Flow

Jawarneh

Vatistas

2005

Journal of Propulsion and Power

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Section: Analysis Of Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of Inlet Conditions on the Pressure Drop in Confined Vortex Flow

Jawarneh

Vatistas

2005

Journal of Propulsion and Power

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“…An important feature of CFD is the occurrence of a weak time-dependent flow structure, particularly with the Reynolds stress model. Jawarneh et al (2005) presented a study of flow in a jet-driven vortex chamber for a wide range of Reynolds numbers, contraction ratios, inlet angles, areas, and aspect ratios. The salient properties of flow and the influence of nondimensional parameters on the pressure coefficient and vortex core size were obtained.…”

Section: Introductionmentioning

confidence: 99%

Swirl Characteristics of Vortex Valve Variable-Thrust Solid Rocket Motor

Wei

2018

JAFM

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In accordance with the flow characteristics of vortex valve variable-thrust solid rocket motors, a cold flow experimental system based on Particle Image Velocimetry was established. A flow velocity vector diagram of vortex chamber was generated, and the vortex structure was analyzed. The results provided an experimental foundation for numerical simulation. The flow characteristics in vortex chamber and in the throat and divergent sections of the nozzle were modeled and simulated. The flow in the vortex chamber conformed to the complex Rankine vortex, and the flow field was divided into three different zones. The vortex core was the primary influence factor for thrust modulation. The resultant velocity reached Mach number 1 before gas arrived at nozzle throat, and the axial velocity still reached Mach number 1 at nozzle throat. Hence, the axial velocity can be used to judge the occurrence of choking at the nozzle throat. The intensity of swirl flow in divergent section of the nozzle was evidently lower than that in vortex chamber and throat. As a result, a lowpressure zone emerged around the central axis, thereby causing thrust losses.

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“…Several methods of jet vortex equipment have been established. Jawarneh et al [23] have produced a swirling flow by integrating one swirler to the vortex chamber and developed a formula describing the pressure drop, while Yilmaz et al [24] created swirl by a radial vane. Experimental and analytical study of the pressure drop across a double-outlet vortex chamber using a single generator has been done by Jawarneh et al [25].…”

Section: Introductionmentioning

confidence: 99%

Double vortex generators for increasing the separation efficiency of the air separator

Jawarneh¹,

Al‐Widyan²,

Al-Migdady³

et al. 2017

IJHT

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This article presents a numerical analysis of multi-phase flow with powerful swirling streams in a cylindrical separator equipped with two vortex generators in an attempt to predict the separation efficiency of an air-water mixture. New design of a cylindrical separator is introduced for air-water mixture.The mixture multiphase and large eddy simulation (LES) turbulence models were applied. Images that concern velocity field, pressure, and volume fraction are introduced. Air phase is trapped and localized along the centerline of the separator and then migrates toward the upper exit hole, while water phase is distributed and rotated along the wall, then confined at the mid-separator due to two strong clock-wise centrifugal forces before it is expelled through its exit at mid of separator. It was found that the separation efficiency at constant Reynolds number of 8×10 4 with two feeding volume fractions of 95% and 90% are 97.8% and 96.1%, respectively. Also, the separation efficiency at constant feeding volume fraction of 95% with two Reynolds numbers of 2×10 5 and 8×10 4 are 98.6% and 97.8%, respectively. It is revealed that the separation efficiency will increase as the Reynolds number increases and/or increasing the volume fraction.

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On Flow Development in Jet-Driven Vortex Chambers

Cited by 8 publications

References 7 publications

Effect of Inlet Conditions on the Pressure Drop in Confined Vortex Flow

Effect of Inlet Conditions on the Pressure Drop in Confined Vortex Flow

Swirl Characteristics of Vortex Valve Variable-Thrust Solid Rocket Motor

Double vortex generators for increasing the separation efficiency of the air separator

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