Author: Sara Toutiaei
Publisher:
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.
Experimental Investigation of Turbulent Swirling Jets
Author: Sara Toutiaei
Publisher:
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.
Publisher:
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.
Experimental Investigation of the Structure of Turbulent Swirling Jets
Author: Eric J. DeMillard
Publisher:
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.
Publisher:
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.
Experimental Investigation of Swirling Turbulent Jets
Integrated Computational/experimental Study of Turbulence Modification and Mixing Enhancement in Swirling Jets
Author: Jonathan Wayne Naughton
Publisher:
ISBN:
Category : Eddies
Languages : en
Pages : 30
Book Description
Swirling jet flows have been studied experimentally and computationally and the results have been compared with theory. Three-component Laser Doppler Anemometry (LDA) measurements have been carried out for swirling jets of various strengths and swirl distributions. Radial profiles of velocity have been obtained from the jet exit to 50 diameters downstream. The experimental results are consistent with previous results and with similarity theory for weakly swirling turbulent jets. However, the parametric range and spatial domain of the current data set makes it suitable for validation. Computational simulations have also been performed using a combination of Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) approaches. The results have been validated with experimental data and used to explore the mechanisms behind the increased mixing enhancement observed. The combined experimental/computational effort is still ongoing, but the experiences to date have demonstrated the effectiveness of such an approach.
Publisher:
ISBN:
Category : Eddies
Languages : en
Pages : 30
Book Description
Swirling jet flows have been studied experimentally and computationally and the results have been compared with theory. Three-component Laser Doppler Anemometry (LDA) measurements have been carried out for swirling jets of various strengths and swirl distributions. Radial profiles of velocity have been obtained from the jet exit to 50 diameters downstream. The experimental results are consistent with previous results and with similarity theory for weakly swirling turbulent jets. However, the parametric range and spatial domain of the current data set makes it suitable for validation. Computational simulations have also been performed using a combination of Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) approaches. The results have been validated with experimental data and used to explore the mechanisms behind the increased mixing enhancement observed. The combined experimental/computational effort is still ongoing, but the experiences to date have demonstrated the effectiveness of such an approach.
Experimental Investigation of Turbulent Swirling Flow in an Annulus
Author: Fathy Milad Yowakim
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 714
Book Description
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 714
Book Description
An Experimental and Numerical Study of Surface Interactions in Turbulent Swirling Jets
Author: Zahir Uddin Ahmed
Publisher:
ISBN:
Category : Fluid-structure interaction
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category : Fluid-structure interaction
Languages : en
Pages :
Book Description
An Experimental Investigation of Gas Jets in Confined Swirling Air Flow
Author: Ronald M. C. So
Publisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 164
Book Description
Publisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 164
Book Description
Experimental and Theoretical Study of Turbulent Swirling Jets Issuing from a Round Orifice
Author: Nehemiah A. Chigier
Publisher:
ISBN:
Category : Aerial spraying and dusting in agriculture
Languages : en
Pages : 76
Book Description
Publisher:
ISBN:
Category : Aerial spraying and dusting in agriculture
Languages : en
Pages : 76
Book Description
Experimental Investigation of Swirling Jet Flow
Experimental Investigation of the Mixing of Highly Swirling Flows
Author: Jack Denton Mattingly
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 926
Book Description
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 926
Book Description