Topic
Jet engine performance
About: Jet engine performance is a research topic. Over the lifetime, 41 publications have been published within this topic receiving 401 citations.
Papers
TL;DR: The shape memory alloy (SMA) technology has been used in a number of large-scale SMA-based programs, such as the SAMPSON smart inlet and variable geometry chevron as discussed by the authors.
Abstract: In order to continue the current rate of improvements in aircraft performance, aircraft and components which are continuously optimized for all flight conditions, will be needed. Toward this goal morphing-capable, adaptive structures based on shape memory alloy (SMA) technology that enable component and system-level optimization at multiple flight conditions are being developed. This paper reviews five large-scale SMA based technology programs initiated by The Boeing Company. The SAMPSON smart inlet program showed that fully integrated SMA wire bundles could provide a fighter aircraft with a variable engine inlet capability. The reconfigurable rotor blade program demonstrated the ability of highly robust, controlled 55-Nitinol tube actuators to twist a rotor blade in a spin stand test to optimize rotor aerodynamic characteristics. The variable geometry chevron (VGC) program, which was the first use of 60-Nitinol for a major aerospace application, included a flight test and static engine test of the GE90-115B engine fitted with controlled morphing chevrons that reduced noise and increased engine efficiency. The deployable rotor tab employed tube actuators to deploy and retract small fences capable of significantly reducing blade-vortex interaction generated noise on a rotorcraft. Most recently, the variable geometry fan nozzle program has built on the VGC technology to demonstrate improved jet engine performance. Continued maturation of SMA technology is needed in order to develop innovative applications and support their commercialization.
145 citations
TL;DR: In this article, the authors present a new monitoring method, integrating energy harvesting technology with wireless sensors to achieve real-time self-powered engine monitoring, and demonstrate a 22.52-g energy harvester capable of high power output (78.87mW), broad working bandwidth (22.5 Hz), and strong reliability (2100 RPM).
87 citations
1 Oct 1993
TL;DR: In this paper, a simple model is used to calculate the thermal efficiency and specific power of simple jet engines and jet engines with a wave-rotor topping cycle, and the performance of the wave rotor is based on measurements from a previous experiment.
Abstract: A simple model is used to calculate the thermal efficiency and specific power of simple jet engines and jet engines with a wave-rotor topping cycle. The performance of the wave rotor is based on measurements from a previous experiment. Applied to the case of an aircraft flying at Mach 0.8, the calculations show that an engine with a wave rotor topping cycle may have gains in thermal efficiency of approximately 1 to 2 percent and gains in specific power of approximately 10 to 16 percent over a simple jet engine with the same overall compression ratio. Even greater gains are possible if the wave rotor's performance can be improved.
49 citations
TL;DR: It is proposed that this concept of lost thermodynamic work as measured between the actual and the reversible device can, in fact, be extended to encompass other sub-systems and ultimately can be applied across the overall aerospace vehicle.
Abstract: The performance continuum for air-breathing engines is formally developed and illustrated in terms of fundamental thermodynamic quantities including heat and work interactions and the irreversibility occurring in the flow-path of the engine. The thermodynamically consistent base-line from which performance losses due to irreversibility must be measured is clearly defined based on this analysis. Issues and problems with conventional flow availability (flow exergy) in terms of the assessment (design and optimization) of jet engines are discussed. The formal analytical relationship between lost thrust work and the irreversible generation of entropy in a jet engine is then reviewed in terms of underlying principle and methodology used to quantify this lost thrust work. This relationship is then extended based on the same underlying principle to the more general concept of lost thermodynamic work across a jet engine. It is then proposed that this concept of lost thermodynamic work as measured between the actual and the reversible device (rather than as referenced to a thermodynamic dead state) can, in fact, be extended to encompass other sub-systems and ultimately can be applied across the overall aerospace vehicle.
43 citations
1 Jan 2008
TL;DR: The Shape Memory Alloy (SMA) technology has been used for component and system level optimization at multiple flight conditions, such as the Reconfigurable Rotor Blade and Variable Geometry Fan Nozzle as discussed by the authors.
Abstract: The Boeing Company has a goal of creating aircraft that are capable of continuous optimization for all flight conditions. Toward this goal we have developed morphing-capable, adaptive structures based on Shape Memory Alloy (SMA) technology that enable component and system level optimization at multiple flight conditions. The SAMPSON Smart Inlet program showed that fully integrated SMA wire bundles could provide a fighter aircraft with a Variable Engine Inlet capability. The Reconfigurable Rotor Blade program demonstrated the ability of highly robust, controlled 55-Nitinol tube actuators to twist a rotor blade in a spin stand test to optimize aerodynamic characteristics. The Variable Geometry Chevrons program, which was the first use of 60-Nitinol for a major aerospace application, included a flight test and static engine test of GE90–115B engine fitted with controlled morphing chevrons that reduced noise and increased engine efficiency. The Deployable Rotor Tab employed tube actuators to deploy and retract small fences which are capable of significantly reducing blade vortex interaction generated noise on a rotorcraft. Most recently, the Variable Geometry Fan Nozzle program has built on the VGC technology to demonstrate improved jet engine performance. The Boeing Company continues to mature SMA technology in order to develop innovative applications and support their commercialization.Copyright © 2008 by The Boeing Company
26 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 1 |
| 2019 | 1 |
| 2018 | 1 |
| 2017 | 1 |
| 2016 | 1 |