Abstract

The objectives of this research are to examine the effects of trailing edge modifications of the inboard elevon of a blended-wing-body (BWB) aircraft, the goal being to try and reduce the hinge moment of the inboard elevon through selective aerodynamic design. A computational model was built for 60⁰ and 70⁰ beveled trailing edge modifications, as well as no modification. The inboard elevon was deflected positive 5⁰ and negative 5⁰. The numerical solutions were obtained using an implicit solver and inviscid model. The results of this research showed that, through the use of a beveled trailing edge on the inboard elevon, a maximum of 112% reduction in the hinge moment could be achieved for the negative deflection case and a maximum of 88% reduction in the hinge moment for the positive deflection case. The results showed that there was a significant improvement in the hinge moments, with less that a 2% average change in the overall aerodynamic performance of the BWB for the inviscid models.

Highlights

  • From the wood and fabric covered wings and open air cockpit of the Wright Flyer to the aluminum swept wings and pressurized cabin of the B-47, the design of aircraft had come a long way since that first powered flight

  • Compare the modem Boeing 777 (B777), see figurel.l, to the B-47 and there isn’t as stark a change as the Wright flyer compared to the B-47

  • The flow effects in this region can be further displayed by plotting the velocity vectors in this region for both the 60" beveled edge modification and the unm odified trailing edge, as shown in figures 5.11 and 5.12

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Summary

Introduction

From the wood and fabric covered wings and open air cockpit of the Wright Flyer to the aluminum swept wings and pressurized cabin of the B-47, the design of aircraft had come a long way since that first powered flight. Another 5 decades and much hasn’t changed in the design of aircraft. Modeling of half the aircraft in tliis situation allows for significant reduction in grid size and a significant savings in computational resources This data was imported into Gambit, a pre-processor software package produced by Fluent for the creation of computational grids for the use in CFD. Fixed Grid, is applied only in very specific circumstances when the grid produced using the TFI method is adequate except for any slope discontinuities which are smoothed

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