LAPSE:2023.3669
Published Article
LAPSE:2023.3669
Numerical Research on the Jet-Mixing Mechanism of Convergent Nozzle Excited by a Fluidic Oscillator and an Air Tab
February 22, 2023
Abstract
Unsteady numerical simulations, coupled with the SST (Shear Stress Transport) k-ω turbulence model, were conducted to study the mixing-enhancement characteristics of the excited jet generated by the fluidic oscillator and the air tab in a single channel convergent nozzle with an inlet total pressure of 140−200 kPa. Compared with the steady air-tab jet, the sweeping jet generated by the fluidic oscillator has roughly the same penetration in the main flow, but it can induce streamwise vortices and planar vortices of larger scale and longer duration, which is beneficial to enhance jet mixing efficiency in the range of 1.0 D (D represents the diameter of the main nozzle outlet) downstream from the main nozzle. When x > 1.0 D, the jet mixing is mainly dominated by the shear layer between the main jet and the ambient. As the sweeping jet suppresses the expansion of the main jet, which reduces the contact area between the main jet and the ambient, its mixing efficiency is less than that of the air tab in this region. With the increasing inlet total pressure of the fluidic oscillator, the influence range of the sweeping jet is increased, but its mixing efficiency does not increase significantly. In general, the fluidic oscillator can use a small jet flow (<5%) to achieve a high mixing efficiency (i.e., 60% at x = 2.0 D) at the expense of low total pressure loss (<2.3%), which indicates that it has good engineering applicability.
Unsteady numerical simulations, coupled with the SST (Shear Stress Transport) k-ω turbulence model, were conducted to study the mixing-enhancement characteristics of the excited jet generated by the fluidic oscillator and the air tab in a single channel convergent nozzle with an inlet total pressure of 140−200 kPa. Compared with the steady air-tab jet, the sweeping jet generated by the fluidic oscillator has roughly the same penetration in the main flow, but it can induce streamwise vortices and planar vortices of larger scale and longer duration, which is beneficial to enhance jet mixing efficiency in the range of 1.0 D (D represents the diameter of the main nozzle outlet) downstream from the main nozzle. When x > 1.0 D, the jet mixing is mainly dominated by the shear layer between the main jet and the ambient. As the sweeping jet suppresses the expansion of the main jet, which reduces the contact area between the main jet and the ambient, its mixing efficiency is less than that of the air tab in this region. With the increasing inlet total pressure of the fluidic oscillator, the influence range of the sweeping jet is increased, but its mixing efficiency does not increase significantly. In general, the fluidic oscillator can use a small jet flow (<5%) to achieve a high mixing efficiency (i.e., 60% at x = 2.0 D) at the expense of low total pressure loss (<2.3%), which indicates that it has good engineering applicability.
Record ID
Keywords
air tab, convergent nozzle, fluidic oscillator, mixing mechanism, sweeping jet
Suggested Citation
Li M, Lei Z, Deng H, Ouyang X, Zhang Y, Lu X, Xu G, Zhu J. Numerical Research on the Jet-Mixing Mechanism of Convergent Nozzle Excited by a Fluidic Oscillator and an Air Tab. (2023). LAPSE:2023.3669
Author Affiliations
Li M: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China; Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China
Lei Z: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Deng H: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Ouyang X: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China; Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China
Zhang Y: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Lu X: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Xu G: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Zhu J: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Lei Z: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Deng H: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Ouyang X: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China; Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China
Zhang Y: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Lu X: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Xu G: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Zhu J: Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China; School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Journal Name
Energies
Volume
16
Issue
3
First Page
1412
Year
2023
Publication Date
2023-01-31
ISSN
1996-1073
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PII: en16031412, Publication Type: Journal Article
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LAPSE:2023.3669
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https://doi.org/10.3390/en16031412
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