Vortex Structure Analysis of Aerodynamic Blended Wing Body

Abstract

Fighters and civil aircraft require different sources of lift during cruise because of the distinct flight requirements The primary condition of civil aircraft is flight stability whereas fighter aircraft requires high-performance flight such as high angle of attack(AOA) climb and dogfight ability such conditions require better lift performance which means that the pressure difference between the upper and lower surfaces of the wing is greater Therefore the vortex structure and separated flow dominate the aerodynamic characteristics of fighters mainly In order to increase the vortex stability on the wing surface researchers developed some devices such as vortex generator leading edge root extension(LEX LERX strake) or blended wing to postpone the separated positions of surface flow or maintain the vortices structures on wing surface so that increases the lift performance of fighters at high angle of attack In this research flow visualization and particle image velocimetry (PIV) was conducted to understand the flow field of the LEX model NASA TP-1803 Observe the formation and development of the vortex structures in flow visualization images to realize the qualitative characteristics and measure velocity on the wing surface to analyze the quantitative data of vortex structures around NASA TP-1803 model understanding the flow field effects result from the strake vortex

Date of Award	2020
Original language	English
Supervisor	Jiun-Jih Miau (Supervisor)