Author: X. Hong-gingPublisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
Experimental Investigation of Swirling Jet Flow
Experimental Investigation of Turbulent Swirling Jets
Author: Sara ToutiaeiPublisher:
ISBN: 9781321238839
Category : Jets
Languages : en
Pages : 52
Book Description
In this study, velocity distributions of a swirling and a non-swirling jet flows were obtained using Laser Doppler Anemometer (LDA) in the near field where both jets are at the same stages of development. The resulting mean velocity and Reynolds stress distributions and the energy budgets of the axial Reynolds stresses are assessed. All Reynolds stresses showed higher magnitude in the swirling case compared to the non-swirling one at the same measurement axial locations. The swirling jet is found to exhibit larger production, mean convection and turbulence transport terms in the energy budget of axial Reynolds stress. The result shows faster development of the swirling jet compared with the non-swirling jet and is in consistency with previous studies. The turbulent transport term is found to be responsible for the faster development of the turbulence in the swirling jet.
An Experimental Study of Swirling Jets
Author: Ing Kiet Francis TohPublisher:
ISBN:
Category : Jets
Languages : en
Pages : 247
Book Description
The mean flow properties and the instantaneous flow structures of the jets are then investigated. The introduction and increase of swirl result in a higher jet growth, decay and turbulent intensity, the formation of an off-axis axial velocity maximum and the occurrence of vortex breakdown. The swirl-induced jet growth enhancement can be categorized into three regimes: a low swirl regime in which there is a limited enhancement, a moderate swirl regime in which the enhancement scales with swirl, and a high swirl regime in which vortex breakdown dominates the process. The jet growth behavior in the high swirl regime is found to be dependent on the structure of the jet and the vortex breakdown configuration. A significant change in the flow structures and certain mean flow properties including the centerline and local maximum axial velocity decay are observed in the low and the moderate swirl regimes. These properties appear to be less sensitive to swirl in the high swirl regime after the occurrence of vortex breakdown. The effects of Reynolds number on swirling jets may not be identical to that on a non-swirling jet. The statistical characteristics measured show that low velocity occasions in the vicinity of the jet centerline start to appear at a sufficiently high degree of swirl. These occasions increase with swirl until the eventual occurrence of vortex breakdown. The statistical characteristics of jets that have undergone vortex breakdown are very similar, as they are dominated by the vortex breakdown phenomenon. The mean flow and the statistical measurements also reveal the presence of an unstable vortex breakdown that is difficult to detect using flow visualization and instantanous velocity field measurements.
An Experimental Investigation of Gas Jets in Confined Swirling Air Flow
Author: Ronald M. C. SoPublisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 164
Book Description
Experimental Investigation of Coannular Jet Flow with Swirl Along a Centerbody
Author: M. O. FreyAn Experimental Investigation of Gas Jets in Confined Swirling Air Flow
Author: Ronald M. C. SoPublisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 170
Book Description
Experimental Investigation of the Mixing of an Axial Jet Within a Swirling Flow, Utilizing Laser Doppler Velocimetry and Particle Image Velocimetry
Author: David Joseph DanitzAnalytical and Experimental Investigation of Flow Fields of Annular Jets with and Without Swirling Flow
Author: Experimental Investigation of the Mixing of Highly Swirling Flows
Author: Jack Denton MattinglyPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 926
Book Description
Experimental Investigation of the Structure of Turbulent Swirling Jets
Author: Eric J. DeMillardPublisher:
ISBN: 9781085621250
Category : Fluid dynamics
Languages : en
Pages : 56
Book Description
Experimental investigations were carried out in both non-swirling and swirling jets at a Re = 105. A stereoscopic particle image velocimetry (SPIV) system was used to acquire the measurements in both axial-radial and radial-tangential planes at x/D = (1-10). Multiple test cases were taken where both the swirl magnitude and swirl distribution was adjusted. Proper Orthogonal Decomposition (POD) was then applied to the measurements to characterize turbulence structure. The results indicate that swirl causes the structure to be more ordered and shifts the relative amount of energy from axisymmetric structure to azimuthal structure.