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The Role of Design-of-Experiments in Managing Flow in Compact Air Vehicle InletsIt is the purpose of this study to demonstrate the viability and economy of Design-of-Experiments methodologies to arrive at microscale secondary flow control array designs that maintain optimal inlet performance over a wide range of the mission variables and to explore how these statistical methods provide a better understanding of the management of flow in compact air vehicle inlets. These statistical design concepts were used to investigate the robustness properties of low unit strength micro-effector arrays. Low unit strength micro-effectors are micro-vanes set at very low angles-of-incidence with very long chord lengths. They were designed to influence the near wall inlet flow over an extended streamwise distance, and their advantage lies in low total pressure loss and high effectiveness in managing engine face distortion. The term robustness is used in this paper in the same sense as it is used in the industrial problem solving community. It refers to minimizing the effects of the hard-to-control factors that influence the development of a product or process. In Robustness Engineering, the effects of the hard-to-control factors are often called noise , and the hard-to-control factors themselves are referred to as the environmental variables or sometimes as the Taguchi noise variables. Hence Robust Optimization refers to minimizing the effects of the environmental or noise variables on the development (design) of a product or process. In the management of flow in compact inlets, the environmental or noise variables can be identified with the mission variables. Therefore this paper formulates a statistical design methodology that minimizes the impact of variations in the mission variables on inlet performance and demonstrates that these statistical design concepts can lead to simpler inlet flow management systems.
Document ID
20030068105
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Anderson, Bernhard H. (NASA Glenn Research Center Cleveland, OH, United States)
Miller, Daniel N. (Lockheed Martin Aerospace Fort Worth, TX, United States)
Gridley, Marvin C. (Department of the Air Force Wright-Patterson AFB, OH, United States)
Agrell, Johan (Swedish Defence Research Establishment Bromma, Sweden)
Date Acquired
September 7, 2013
Publication Date
September 1, 2003
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA/TM-2003-212601
E-14158
NAS 1.15:212601
Meeting Information
Meeting: Vehicle Propulsion Integration Symposium
Location: Warsaw
Country: Poland
Start Date: October 6, 2003
End Date: October 9, 2003
Sponsors: North Atlantic Treaty Organization
Funding Number(s)
WBS: WBS-22-708-92-24
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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