Experimental investigation of droplet velocity fields from elliptic injectors in subsonic cross flow

Alvi, AU and Thakur, A and Jangam, S and Pratheesh Kumar, P and Iyengar, VS (2019) Experimental investigation of droplet velocity fields from elliptic injectors in subsonic cross flow. In: ASME 2019 Gas Turbine India Conference, December 5–6, 2019, Chennai, Tamil Nadu, India.

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Official URL: https://asmedigitalcollection.asme.org/GTINDIA/pro...


The flow field associated with a liquid jet injected transversely into a crossflow, also referred as transverse jet has numerous applications in industrial, environmental and natural systems. Examples of these applications include air-breathing engines (gas turbine afterburners, ramjet and scramjet combustors), rocket engines, environmental control systems and natural flows. Earliest research of a jet in a crossflow has been motivated by applications related to environmental problems such as plume dispersal from exhaust or pipe stacks or liquid effluent dispersal in streams. This method of liquid fuel/air mixture preparation enhances flame stabilization, fuel conversion efficiency, and reduction in emissions. In gas turbine applications because of the very limited residence time available for effective fuel air mixing, detailed investigations into spray characteristics of different injector configurations in a crossflow environment is desirable for identifying promising configurations with measurements in the near field to acquire reliable spray data for development of CFD models. The velocity field of a liquid jet in the near field ejecting out from an elliptic injector into a crossflow of air were investigated experimentally at conditions relevant to gas turbine applications. A rig was set up to investigate the injection of liquid jet in subsonic cross flow with a rectangular test section of cross section measuring 100 mm by 140 mm. Experiments were done with a two injector configurations a circular 0.8mm diameter plain orifice injector and a elliptic injector with an equivalent effective area of 0.7 mm (minor axis) by 0.95 mm (major axis) which was flush mounted on the bottom plate of test section. PIV technique was used to measure droplet velocity field and distributions in the near field of the spray. Measurements were performed at a distance of 5 mm from the bottom wall in the span wise plane and the results were compared with a circular injector. It was seen that no significant differences were observed in the u and v velocity components for the elliptic and circular injectors where the geometry changes are small suggesting that parameters like velocity are not significantly affected by small changes in injector exit geometry. Further for elliptic jets it was observed that increasing the crossflow velocity and maintaining the same liquid flow rate lead to an increase in the lateral spread of the spray with no significant change in the mean vorticity values.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Cross-flow, Drops, Ejectors, Sprays, Flow (Dynamics), Fuels, Gas turbines, Geometry, Air-breathing engines, Combustion chambers, Computational fluid dynamics, Control systems, Emissions, Exhaust systems, Flames, Jets, Pipes, Plumes (Fluid dynamics), Ramjets, Rocket engines, Scramjets, Vorticity
Subjects: AERONAUTICS > Aircraft Propulsion and Power
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 07 Jun 2022 11:36
Last Modified: 07 Jun 2022 11:36
URI: http://nal-ir.nal.res.in/id/eprint/13587

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