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Experimental studies on structure of airblast spray in crossflow

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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Official URL: https://dx.doi.org/10.1007/s12046-019-1096-y

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
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
Depositing User: Ms Ranganayaki RS
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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