Roll oscillations over wing-body configuration with strake wings: Experiment

LI Qian; WANG Yankui; JIA Yuhong

doi:10.7527/S1000-6893.2021.26008

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2022 , Vol. 43 >Issue 11: 526008 - 526008

DOI: https://doi.org/10.7527/S1000-6893.2021.26008

Articles

Roll oscillations over wing-body configuration with strake wings: Experiment

LI Qian ,
WANG Yankui ,
JIA Yuhong

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School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China

Received date: 2021-06-23

Revised date: 2021-07-16

Online published: 2021-08-03

Supported by

National Natural Science Foundation of China (11972060,11721202)

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Abstract

Aiming at the problem of un-commanded motion at high angles of attack, we study the roll oscillation of wing-body configurations with strake wings through wind tunnel experiments such as free-to-roll tests, force and pressure measurement, and Particle Image Velocimetry (PIV). The pitch angle zones of roll oscillations are obtained, the dominant flow inducing wing rock revealed, and the triggering, deviation and sustaining mechanisms of roll oscillations discussed. The results show that the wing rock is onset over the wing-body configuration with strake wings at high angles of attack. The roll oscillation can be divided into three areas:fixed-point motion zone one (pitch angle 5°-35°), limit-cycle oscillation zone (pitch angle 37.5°-50°) and fixed-point motion zone two (pitch angle 55°-70°). The limit-cycle oscillation zone can be further divided into the fore-body vortex no-dominant zone (pitch angle 37.5°-45°) and partially-dominant zone (pitch angle 47.5°-50°). The analysis of the wing rock at pitch angles 40° and 50° reveals that the evolution of the wake of the strake wing vortex or merged strake wing vortex at zero roll angle and nonzero roll angle forms the triggering and deviation mechanisms, respectively. The hysteresis of the wake undergoing roll oscillations forms the sustaining mechanism.

Key words： wing rock; strake wings; wing-body configurations; wind tunnel tests; flow mechanism

Cite this article

LI Qian , WANG Yankui , JIA Yuhong . Roll oscillations over wing-body configuration with strake wings: Experiment[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022 , 43(11) : 526008 -526008 . DOI: 10.7527/S1000-6893.2021.26008

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