NASA GRC Stirling Technology Development Overview

Thieme, Lanny G.; Schreiber, Jeffrey G.

doi:10.1063/1.1541346

Cited by 17 publications

(9 citation statements)

References 13 publications

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“…Study of the cure kinetics has progressed and the characteristics are now well understood. 4 Short-term tests have been completed, and long-term durability testing is being planned to age the bond for up to three years in a helium environment.…”

Section: Other Tasksmentioning

confidence: 99%

“…A roadmap has been proposed with a second-generation generator with reduced mass and a third-generation generator with increased performance. 4 The improvements needed for the second-generation convertor will be through mass improvements that make use of lightweight Stirling convertor designs, improvements in the fraction of Carnot efficiency that can be obtained, increased in the Carnot efficiency, and reduced mass controllers.…”

Section: Advanced Technologymentioning

confidence: 99%

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Overview of NASA GRC Stirling Technology Development

Schreiber

Thieme

2003

1st International Energy Conversion Engineering Conference (IECEC)

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Section: Other Tasksmentioning

confidence: 99%

Section: Advanced Technologymentioning

confidence: 99%

Overview of NASA GRC Stirling Technology Development

Schreiber

Thieme

2003

1st International Energy Conversion Engineering Conference (IECEC)

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“…The SRG is being developed for multi-mission use including providing electric power for unmanned Mars rovers and deep space missions in environments with and without atmospheres. One of the multiple efforts underway includes the development of a multi-dimensional Stirling computational fluid dynamics code, including second law analysis post-processing to separate various thermodynamic losses 34,37 in Stirling engines. The second law loss analysis effort documented in this paper supports the efforts underway in the Stirling research community and is sponsored by NASA grant NNC05AA24A.…”

Section: A Backgroundmentioning

confidence: 99%

Effect of Adding a Regenerator to Kornhauser's MIT "Two-Space" (Gas-Spring + Heat Exchanger) Test Rig

Ebiana

Gidugu

2008

6th International Energy Conversion Engineering Conference (IECEC)

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This study employed entropy-based second law post-processing analysis to characterize the various thermodynamic losses inside a 3-space solution domain (gas spring + heat exchanger + regenerator) operating under conditions of oscillating pressure and oscillating flow. The 3-space solution domain is adapted from the 2-space solution domain (gas spring + heat exchanger) in Kornhauser's MIT test rig by modifying the heat exchanger space to include a porous regenerator system. A thermal non-equilibrium model which assumes that the regenerator porous matrix and gas average temperatures can differ by several degrees at a given axial location and time during the cycle is employed. An important and primary objective of this study is the development and application of a thermodynamic loss post-processor to characterize the major thermodynamic losses inside the 3-space model. It is anticipated that the experience gained from thermodynamic loss analysis of the simple 3-space model can be extrapolated to more complex systems like the Stirling engine. It is hoped that successful development of loss post-processors will facilitate the improvement of the optimization capability of Stirling engine analysis codes through better understanding of the heat transfer and power losses. It is also anticipated that the incorporation of a successful thermal nonequilibrium model of the regenerator in Stirling engine CFD analysis codes, will improve our ability to accurately model Stirling regenerators relative to current multi-dimensional thermal-equilibrium porousmedia models.

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“…Multiple efforts are underway to achieve these goals, both in-house at GRC and under various grants and contracts. These efforts include development of a multi-dimensional Stirling computational fluid dynamics code, including second law analysis post-processing to separate various thermodynamic losses; high-temperature materials; advanced controllers; an end-to-end system dynamics model; low-vibration techniques; advanced regenerators; and a lightweight converter 33 . This paper reports the results of a second law analysis post-processing effort to evaluate various thermodynamic losses in the flow spaces in two Massachusetts Institute of Technology (MIT) test rigs -piston-cylinder and pistoncylinder-heat exchanger -operating under conditions of oscillating pressure and oscillating flow.…”

Section: Nasa Sti Program In Profilementioning

confidence: 99%