Optimization of Rounded Spike on Hypersonic Forebody Reattachment
Generally, the designing of supersonic and hypersonic vehicles has some major problems of reducing drag and aerodynamic heating which are considered as the important criteria. In hypersonic vehicles, the frontal area of blunt forebody nose is larger, so t
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Abstract Generally, the designing of supersonic and hypersonic vehicles has some major problems of reducing drag and aerodynamic heating which are considered as the important criteria. In hypersonic vehicles, the frontal area of blunt forebody nose is larger, so the drag and aerodynamic heating will be high. This blunt body generates more heat energy that can cause ablation to the vehicle materials and will affect the performance. Basically, blunt body produces more drag, so as to minimize drag and aerodynamic heating spike with aero disk was introduced. Presently, researchers introduced spike with aero disk in hypersonic blunt body; it is fitted at the front of the forebody stagnation point and it is projected upstream side. Normally, blunt body produces bow shock; this strong bow shock has changed into weak shock due to the aero disk with spike. So the aero disk creates an oblique shock wave and is useful to reduce drag. Normally, the high speed flows are best defined as the regime where certain physical flow phenomena become progressively more important as the Mach number is increased to higher values. The high temperature regions in the flow field around a blunt-nosed body and the massive amount of flow kinetic energy in a hypersonic free stream are converted into internal energy of the gas across the strong shock wave, hence reducing very high temperatures in the shock layer nearer the nose. The temperature in the shock layer of a high speed re-entry vehicle can be very high. The objective of this research is to design and optimize the model very effectively and to reduce drag, aerodynamic heating, and to delay the reattachment point on the forebody. In this research, an optimization of rounded aero disk with spike, the changing the aero disk diameter ratios along Y-directions 2r, 2.5r, 3r, 3.5r, and 4r at different ratios. It is found that the results detailed to minimize the drag, aerodynamic heating, and also delay reattachment point. It is found that the reattachment point changes on the forebody with respect to diameter of the rounded spike (aero disk). The model was created and simulated by using of CFD commercial software. A. Sureshkumar (*) · S. Nadaraja Pillai Department of Aeronautical Engineering, GKM College of Engineering and Technology, Chennai 600063, India e-mail: [email protected] P. Manikandan Department of Aerospace Engineering, Madras Institute of Technology, Chennai 600044, India
S. Sathiyamoorthy et al. (eds.), Emerging Trends in Science, Engineering and Technology, Lecture Notes in Mechanical Engineering, DOI: 10.1007/978-81-322-1007-8_42, © Springer India 2012
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Keywords Aero disk • Blunt forebody • Spike • Shock waves • Aerodynamic heating
1 Introduction The design and optimization of high speed vehicles are important criteria in this world. Now everyone is doing some research in this high speed flow problems. So, the high speed vehicles' major problems are high drag and aerodynamic heating [1]. Normally, the blunt body produces b
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