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STUDY OF BELLY-FLAPS TO ENHANCE LIFT AND PITCHING MOMENT
COEFFICIENT OF A BLENDED-WING-BODY AIRPLANE IN LANDING AND
TAKEOFF CONFIGURATION
by
Yann Daniel Staelens
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(AEROSPACE ENGINEERING)
December 2007
Copyright 2007 Yann Daniel Staelens
Object Description
| Title | Study of belly-flaps to enhance lift and pitching moment coefficient of a blended-wing-body airplane in landing and takeoff configuration |
| Author | Staelens, Yann Daniel |
| Author email | staelens@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Aerospace Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2007-10-22 |
| Date submitted | 2007 |
| Restricted until | Unrestricted |
| Date published | 2007-10-31 |
| Advisor (committee chair) | Blackwelder, Ron |
| Advisor (committee member) |
Page, Mark Browand, Fred Shiflett, Geoff Ioannou, Petros |
| Abstract | During the first century of flight few major changes have been made to the configuration of subsonic airplanes. A distinct fuselage with wings, a tail, engines and a landing gear persists as the dominant arrangement. During WWII some companies developed tailless all-wing airplanes. However the concept failed to advance till the late 80's when the B-2, the only flying wing to enter production to date, illustrated its benefits at least for a stealth platform. The advent of the Blended-Wing-Body (BWB) addresses the historical shortcomings of all-wing designs, specifically poor volume utility and excess wetted area as a result. The BWB is now poised to become the new standard for large subsonic airplanes. Major aerospace companies are studying the concept for next generation of passenger airplanes. But there are still challenges. One is the BWB's short control lever-arm pitch. This affects rotation and go-around performances. This study presents a possible solution by using a novel type of control surface, a belly-flap, on the under side of the wing to enhance its lift and pitching moment coefficient during landing, go-around and takeoff. Increases of up to 30% in lift-off CL and 8% in positive pitching moment have been achieved during wind tunnel tests on a generic BWB-model with a belly-flap. These aerodynamic improvements when used in a mathematical simulation of landing, go-around and takeoff procedure were showing reduction in landing-field-length by up to 22%, in takeoff-field-length by up to 8% and in loss in altitude between initiation of rotation and actual rotation during go-around by up to 21.5%. |
| Keyword | blended-wing-body; all-wing airplane; belly-flap; lift enhancing device; landing; takeoff |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m899 |
| Contributing entity | University of Southern California |
| Rights | Staelens, Yann Daniel |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Staelens-20071031 |
| Archival file | uscthesesreloadpub_Volume23/etd-Staelens-20071031.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Full text | STUDY OF BELLY-FLAPS TO ENHANCE LIFT AND PITCHING MOMENT COEFFICIENT OF A BLENDED-WING-BODY AIRPLANE IN LANDING AND TAKEOFF CONFIGURATION by Yann Daniel Staelens A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (AEROSPACE ENGINEERING) December 2007 Copyright 2007 Yann Daniel Staelens |
