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Effect of Varying Ramp Angle and Leading-Edge Bluntness on the Behavior of Ramp Induced Shock Wave over Triple Ramped Cone Flare Configuration at Hypersonic Speed
Abstract: Numerical simulation results are presented to show the effect of ramp angle variations and leading-edge
bluntness on the flow around triple ramped cone flare in hypersonic flow. This study investigates the changes associated with shock wave boundary layer interaction due to ramp induced flow breakdown and the fluctuation in flow in the presence of blunted leading edge. This type of ramp junctions typically features in re-entry vehicles, engine intakes, system and subsystem junctions, control surfaces, etc. Ramp junctions usually are associated with strong separation bubble that has significant upstream influence impacting the effectiveness of aerodynamic surfaces, engine performance, thermal behavior and stability.
Computation studies are carried out using finite volume-based RANS solver, accuracy of second order and considering compressible laminar flow characteristics, with solver settings provided similar to experimental conditions as per literature. Comprehensive double ramp studies with suggestions on reducing the separation bubble size are invariantly considered in literature, however there has been no study in understanding the
inclusion of additional ramps in such flow scenarios, hence efforts are taken to understand the benefits and implications of including a third ramp along with varying bluntness on the bubble size and its upstream intensity.
Keywords: Hypersonic, Leading edge bluntness, ramp angle, Shock wave and boundary layer interactions
International Journal of Recent Technology and Engineering; Volume-8 Issue-3, September 2019, Page No: 8127-8138, ISSN: 2277-3878; Karthik Sundarraj, Ugur Guven, P.S. Kulkarni, Om Prakash, Ganesh Pawar R.; https://www.ijrte.org/wp-content/uploads/papers/v8i3/C5844098319.pdf
A satellite is expected to move in the orbit until its life is over. This would have been true if the earth was
a true sphere and gravity was the only force acting on the satellite. However, a satellite is deviated from its normal path due to several forces. This deviation is termed as orbital perturbation. The perturbation can be generated due to many known and unknown sources such as Sun and Moon, Solar pressure, etc. This paper discusses the study of perturbation of a Low Earth satellite orbit due to the presence of aerodynamic drag. Numerical method (Runge – Kutta fourth order) is used to solve the Cowell’s equation of perturbation, which consists of ordinary differential equation.
“Experimental Analysis of Low Earth Orbit Satellites due to Atmospheric Perturbations”, IAETSD Journal for Advanced Research in Applied Sciences, Volume 5, Issue 4, April,2018, Raja M, Dr Ugur Guven, Dr OM Prakash,et al. http://iaetsdjaras.org/gallery/24-april-658.pdf, DOI:16.10089.JARAS.2018.V5I4.453459.2517