Sinha, Anubhav and Ravikrishna, R (2019) Experimental studies on structure of airblast spray in crossflow. In: SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES, 44 (5).
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Abstract
The present investigation is focused on experimental studies on the structure of airblast spray in crossflow. Atomizer is at a higher pressure than ambient and the airblast gas is expected to exhibit features generally found in under-expanded gas jets. High-speed images are captured using shadowgraphy technique. Certain wave-like structures observed in the near-nozzle region are attributed to shock-vortex interactions, generally observed in under-expanded gas jets. Proper Orthogonal Decomposition (POD) analysis has been carried out using these images. POD mode shapes clearly show signatures of shock-vortex oscillations and frequencies close to the screeching frequency observed in under-expanded jets. The POD modes are compared for different conditions and the significance of dynamic structures and their temporal behavior is discussed. Finally, a regime map is also proposed to characterize spray behavior in crossflow.
| Item Type: | Journal Article |
|---|---|
| Publication: | SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES |
| Publisher: | SPRINGER INDIA |
| Additional Information: | The copyright for this article belongs to Springer |
| Keywords: | Spray in crossflow; Proper Orthogonal Decomposition (POD); under-expanded jet; shock-vortex interaction; shock-oscillation; Mach disc; screeching jet; spray regimes |
| Department/Centre: | Division of Mechanical Sciences > Mechanical Engineering |
| Date Deposited: | 11 May 2019 06:18 |
| Last Modified: | 11 May 2019 06:23 |
| URI: | http://eprints.iisc.ac.in/id/eprint/62576 |
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