Abstract
The interaction flowfield of gaseous jets ejecting from three different orifice configurations into a Mach 5 turbulent crossflow over a flat plate was investigated experimentally. These jet configurations have equal equivalent throat diameter of 6 mm and nominal exit Mach number of 3. Schlieren photography was used to visualize the spatial flow structures; meanwhile surface oil flow patterns were employed to identify the separation and reattachment regions on the flat plate. Results show the influence of the jet-to-freestream static pressure ratio and jet configurations on flow interaction characteristics.
Highlights
The jet in crossflow (JICF) technique has widespread applications in both aerospace and civil industries
The flowfield relevant to multiple jets injecting into a high speed mainstream typically occurring in engineering fields introduces additional mutual interaction, which further complicates the flowfield structures and interaction characteristics
Results demonstrate high speed transverse jet penetration scales with jet-to-freestream stagnation pressure ratio
Summary
The jet in crossflow (JICF) technique has widespread applications in both aerospace and civil industries. The interaction of a single orifice jet perpendicularly injected into a super/hypersonic crossflow exhibits highly complicated flow phenomena, including shock/boundary layer interaction, shock/shock interaction, flow separation and reattachment as well as complex spatial vortices. Schetz et al [4] conducted an experimental investigation on single and dual jets with velocity ratios from 3 to 8, spacing from 2 to 6 diameters, and injection angles of 90, 75, and 105 deg. X. Li et al [5] to understand the flow structures and the mechanism of amplification factors on a single jet nozzle installed on a flat plate and revolution body. The present paper focuses on the flow visualization of gaseous jets discharging from three different orifice configurations (single, dual and triple in-line) interacting with a hypersonic freestream. The separation regions around the jets on the flat plate were determined by surface oil flow
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