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research-article

Strakes Effects on Asymmetric Flow over a Blunt nosed Slender Body at a high Angle of Attack

[+] Author and Article Information
Yuan Qihang

Ministry-of-Education Key Laboratory of Fluid Mechanics, Beihang University, Beijing 100191, China
yuanqihang@buaa.edu.cn

Wang Yankui

Ministry-of-Education Key Laboratory of Fluid Mechanics, Beihang University, Beijing 100191, China
buaawyk@126.com

QI Zhongyang

Ministry-of-Education Key Laboratory of Fluid Mechanics, Beihang University, Beijing 100191, China
qizhongyang1314@126.com

1Corresponding author.

ASME doi:10.1115/1.4041815 History: Received July 03, 2018; Revised October 21, 2018

Abstract

In general speaking, the missiles execute flight at high angles of attack in order to enhance their maneuverability. However, the inevitable side-force, which is caused by the asymmetric flow over these kinds of traditional slender body configurations with blunt nose at a high attack angle, induces the yawing or rolling deviation and the missiles will lose their predicted trajectory consequently. This study examines and diminishes the side-force induced by the inevitable asymmetric flow around this traditional slender body configuration with blunt nose at a high angle of attack (AoA = 50°). On one hand, the flow over a fixed blunt nosed slender body model with strakes mounted at an axial position of x/D = 1.6-2.7 is investigated experimentally at ? = 50° (D is the diameter of the model). On the other hand, the wingspan of the strakes is varied to investigate its effect on the leeward flow over the model. The Reynolds number is set at ReD = 1.54×105 based on D and incoming upstream velocity. Results verify that the formation of asymmetric vortices is hindered by the existence of strakes and the strake-induced vortices develop symmetrically and contribute to the reduction in side-force of the model. In addition, the increase in strake wingspan reduce asymmetric characteristics of the vortex around the model and cause a significant decrease in side-force in each section measured. The strake with the 0.1D wingspan can reduce the sectional side-force to 25% of that in the condition without strakes.

Copyright (c) 2018 by ASME
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