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기술보고서

기술보고서 게시판 내용
타이틀	Blended Wing Body Concept Development with Open Rotor Engine Intergration
저자	Pitera, David M.;; DeHaan, Mark;; Brown, Derrell;; Kawai, Ronald T.;; Hollowell, Steve;; Camacho, Peter;; Bruns, David;; Rawden, Blaine K.
Keyword	AEROACOUSTICS;; AIRCRAFT PERFORMANCE;; ALIGNMENT;; BLENDED-WING-BODY CONFIGURATIONS;; CARGO;; COMPUTATIONAL FLUID DYNAMICS;; ELEVONS;; ENGINE AIRFRAME INTEGRATION;; FLOW DISTRIBUTION;; NACELLES;; PRESSURE DISTRIBUTION;; ROTOR DYNAMICS;; SYSTEMS ANALYSIS
URL	http://hdl.handle.net/2060/20110023250
보고서번호	NASA/CR-2011-217303
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The purpose of this study is to perform a systems analysis of a Blended Wing Body (BWB) open rotor concept at the conceptual design level. This concept will be utilized to estimate overall noise and fuel burn performance, leveraging recent test data. This study will also investigate the challenge of propulsion airframe installation of an open rotor engine on a BWB configuration. Open rotor engines have unique problems relative to turbofans. The rotors are open, exposed to flow conditions outside of the engine. The flow field that the rotors are immersed in may be higher than the free stream flow and it may not be uniform, both of these characteristics could increase noise and decrease performance. The rotors sometimes cause changes in the flow conditions imposed on aircraft surfaces. At high power conditions such as takeoff and climb out, the stream tube of air that goes through the rotors contracts rapidly causing the boundary layer on the body upper surface to go through an adverse pressure gradient which could result with separated airflow. The BWB / Open Rotor configuration must be designed to mitigate these problems.