Effect of a Circular Ring on the Side Force of a Cone-Cylinder Body

Shashank Gaurav,Subhajyoti Das ,Priyank Kumar

doi:10.5028/jatm.v12.1096

Abstract

This paper aims to investigate the side force on a cone-cylinder geometry at different angles of attack (α) by adopting experiments and computations. The cone-cylinder configuration had a length to diameter ratio (L/D) of 10, and a base diameter (D) of 25 mm. The nose shape had a fineness ratio of approximately 3. Results indicated that the side force increases with the increasing of the angle of attack. A circular ring was used to reduce the side force at different angles of attack. Using a smaller height ring (2% of local diameter) in the initial portion of the body did not reduce the side force significantly at lower angles of attack. However, a ring with larger height (5% of local diameter) placed at 2.5 times the diameter of the body from the tip reduced the side force at almost all the angles of attack.

Highlights

A pointed cylindrical nose shape finds its application in different aerospace vehicles (e. g. a fighter aircraft, tactical missiles, etc.)
Based on the results reported by Kumar and Prasad (2016b), this angle was fixed randomly, it was ensured that there was no variation on it during the experiments, since any variation in the roll angle changes the flow field entirely due to the fact that the change in the roll angle changes, in turn, the orientation of the surface roughness in the azimuth, which mainly governs the asymmetry of the vortex and, the side force
WITHOUT RING Figure 8 presents the comparison of the measured time-averaged side force on the cone–cylinder and ogive–cylinder models at different angles of attack

Summary

Introduction

A pointed cylindrical nose shape finds its application in different aerospace vehicles (e. g. a fighter aircraft, tactical missiles, etc.). The nose can be of various shapes, such as conical, ogival or of blunted tip During the maneuvers, these aerospace vehicles experience different angle of attack regimes. It is clearly observed that the right vortex is larger than the left one This creates a difference in the pressure distribution about the vertical plane of symmetry, leading to the generation of the side force (Allen and Perkins 1951; Lamont and Hunt 1976; Keener et al 1977; Hunt and Dexter 1979; Ericsson and Reding 1980; Dexter and Hunt 1981; Lamont 1982; Zilliac et al 1991; Pidd and Smith 1991; Liu P and Deng 2003; Xuashi et al 2009; Kumar and Prasad 2016b). With further increase in the α beyond 60o, the dominance of the global

Objectives

Methods

Results