Abstract
This work is devoted to the study of unsteady flow with the precessing vortex core (PVC) formed at the exit of a compact vane swirler with varying vanes angle and nozzles diameters. Amplitude-frequency characteristics of the PVC were obtained using two microphones. The modified Strouhal number dependence have showed a good generalization of the data for all nozzle diameters. The averaged and phase-averaged distributions of three components of velocity have been measured via the LDA system. The increasing the recirculation zone at increasing nozzle diameter for the swirl parameter Sg=0.53 and Re=1.5·104 was detected. The degeneration of PVC was detected for all studied nozzle diameters D = 30, 40, 50 mm. In case of smallest diameter D = 30 mm the PVC ceases to be periodic due to the absence of a recirculation zone. The three-dimensional structure of the PVC is reconstructed by the phase averaging method and visualized using the Q-criterion. Formation of the shifted recirculation zone, outer secondary vortex (OSV) and inner secondary vortex (ISV) is observed.
Highlights
IntroductionThere are many unexplored effects that are observed in swirling flows
Nowadays, swirling flows have a wide range of applications [1]
In this work the aerodynamic unsteady flow with formation of a precessing vortex core at the exit of the vane swirler has been investigated
Summary
There are many unexplored effects that are observed in swirling flows. One of the most interesting phenomenon for studying is the vortex decay with the precessing vortex core (PVC) formation. The effect of the vortex core precession has been studied rather tightly. Many researchers try to understand how the level of flow swirling and the geometric dimensions of the region behind the swirler affect the vortex breakdown with the formation of PVC. The real working characteristic of the swirling device has not been known, that hinders generalizing of characteristics for the swirl flows generated by swirlers with different geometries. This work is devoted to the study of the influence of geometry of the nozzle located downstream the swirler on structure of the flow with the PVC phenomenon
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
