Critical Review of Sound‐System Design Concepts, Applied to “Difficult” Reinforcement Situations

A series of tests was conducted to provide data for the design of premixing-prevaporizing fuel-air mixture preparation systems for aircraft gas turbine engine combustors. Fifteen configurations of four different fuel-air mixture preparation system design concepts were evaluated to determine fuel-air mixture uniformity at the system exit over a range of conditions representative of cruise operation for a modern commercial turbofan engine. Operating conditions, including pressure, temperature, fuel-air ratio, and velocity had no clear effect on mixture uniformity in systems which used low-pressure fuel injectors. However, performance of systems using pressure atomizing fuel nozzles and large-scale mixing devices was shown to be sensitive to operating conditions. Variations in system design variables were also evaluated and correlated. Mixture uniformity improved with increased system length, pressure drop, and number of fuel injection points per unit area. A premixing system compatible with the combustor envelope of a typical combustion system and capable of providing mixture nonuniformity (standard deviation/mean) below 15% over a typical range of cruise operating conditions was demonstrated.

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Starprobe thermal shield system design concepts

10.2514/6.1982-78 ◽

1982 ◽

Cited By ~ 2

Author(s):

C. MAAG ◽

J. MILLARD ◽

R. MIYAKE

Keyword(s):

System Design ◽

Thermal Shield ◽

Design Concepts

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Autonomous audio heater car: A comprehensive project-based analog design experience

International Journal of Electrical Engineering Education ◽

10.1177/0020720918756257 ◽

2018 ◽

Vol 55 (2) ◽

pp. 155-167 ◽

Cited By ~ 1

Author(s):

Richard L LeBoeuf ◽

Jorge T Gómez

Keyword(s):

System Design ◽

System Integration ◽

Analog Design ◽

Guided Discovery ◽

Team Members ◽

Design Concepts ◽

Overall Design ◽

The Individual ◽

In Transit ◽

Design Experience

This paper presents a methodology for teaching analog design concepts in the context of a single conceptual design and competition. The autonomous audio heater car is a comprehensive project-based analog design experience within a conceive, design, implement, operate framework. The students participate in the overall design process with guided discovery, rather than merely conducting scripted laboratory exercises. Students develop an understanding of the analog design required for each subsystem through weekly individual pre-laboratory and laboratory exercises. The car is guided to a beacon by light and/or audio tone. In transit, the car heats water to a temperature corresponding to the beacon tone and emits a tone corresponding to the instantaneous water temperature. The project culminates with team-based system integration and a competition. The individual work serves to cross-train all of the team members such that they all contribute effectively in the teams. The project motivated students because it provided a framework for laboratory topics, which would typically be considered without the broader context of a system design introduced at the beginning of the course.

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