Characterization of Strut-mounted 'Through Cavity' for scramjet applications

Danish, TH and Sathiyamoorthy, K and Prateesh Kumar, P and Manjunath, P (2013) Characterization of Strut-mounted 'Through Cavity' for scramjet applications. In: 14th Asia Congress of Fluid Mechanics - 14ACFM, 15-19 Oct. 2013, Hanoi and Halong, Vietnam.

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Scramjet is a variant of ramjet where combustion happens at supersonic speeds. At these supersonic speeds residence time available is of the order of 1 millisecond. So the available time for fuelair mixing, atomization, vaporization and combustion is very low. Wall mounted cavity has proven to be a capable candidate for fuel air mixing and flame stabilization for scramjet. Because of inherent advantages like symmetric flow, avoidance of base wall cooling, symmetric fuelling feasibility etc exploration of strut-mounted ‘through cavity’ has been done. It is a novel configuration formed in the space between two struts immersed in a supersonic flow in tandem. Pressure oscillations inside the cavity are result of unsteadiness in the flow, caused by the interaction of shear layer with the compression wave generated inside the cavity. Experimental characterization is carried out by unsteady pressure measurement inside the cavity for aspect ratios of 2 to 14. Two variants of the cavity, formed by using rectangular and ramp strut as the rear strut and plug nozzle acts as the forward strut, have been used. Width of the cavity has been kept constant. Cavity sees the flow Mach number of 2, total pressure of 7 bar and total temperature of 300 K. Dominant modes of pressure fluctuations are captured at each configuration and effect of aspect ratios and cavity variants are observed. Stable and unstable cavities have been observed. Variation of amplitude of pressure oscillation inside the cavity, along the length of the cavity has also been noticed

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Scramjet,Strut-mounted through cavity
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 20 Jun 2014 08:25
Last Modified: 28 Aug 2015 10:11

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