Drag prediction on the conical and ogival shaped noses of aerodynamic bodies

摘要

The aerodynamic bodies are designed using different nose sections, as they have different effects on its performance. In this paper two types of nose shapes for aerodynamic bodies are considered and CFD analysis of pressure and velocity is performed at the Mach numbers 0.4, 0.8, 1, 1.2, 1.5, 2, 3. Ogival and conical shaped noses are considered in this paper for analysis. Drag is the main co mponent of force that acts on the aerodynamic shapes. A nose drag contributes to a great extent in total drag nearly 20-30% and thus selecting nose is more important for optimu m performance. The total aerodynamic drag act ing on a body is the sum of the zero-lift drag, the induced drag due to angle of attack and/or control surface deflection, and the base pressure drag. The magnitude of the nose drag in relation to the total drag is very distinct to a function of body design and Mach number. Here in this project we consider the nose drag of different nose section (conical and ogival) with different areas and compare them with each other wh ich will let us know the most efficient nose section to be used in different Mach numbers at an angle of attack(a=0). As per the analysis performed, the conical nose section gives better performance co mpared to the ogival shape at all the Mach numbers .