An Experimental Study of Gas Spring Heat Transfer in Reciprocating Cryogenic Machinery

Chafe, J. N.; Smith, J. L.

doi:10.1007/978-1-4613-0639-9_55

Cited by 4 publications

(3 citation statements)

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“…There are only few publications that focus on this shock absorber type [11], dealing with hysteresis models for the pressure-volume relation, where the pressure loss was associated with heat transfer in the gas spring [12][13][14] and absorption of gas molecules into the oil. Wahi [15] investigated the solubility of nitrogen in oil and its effect on the compressibility of the oil.…”

Section: List Of Symbolsmentioning

confidence: 99%

Modeling Dynamic Pressure Loss by Absorption in Oleo-Pneumatic Shock Absorbers without Separator

Willich,

Holzapfel,

Vrabec

2024

Preprint

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A model for the dynamic pressure loss in standard oleo-pneumatic shock absorbers without gas-oil separator for avionics applications is introduced. The dynamics of such a device under load variations is primarily determined by the throttle between the oil chamber and the gas chamber. During operation, gas is absorbed by the oil upon compression and desorbed upon expansion, which are processes that extend over time and entail hysteresis. It is found that the assumption of isothermal conditions is sufficient. An excellent alignment is achieved by the model and the measured hysteresis across diverse drop test scenarios, adjusting a single parameter to a value that is physically reasonable. The standard deviation of the error in pressure is σp = 0.49 bar. Moreover, the model rests on thermodynamic considerations and experimental gas solubility data, while it is consistent with other laboratory data from the literature.

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Section: List Of Symbolsmentioning

confidence: 99%

Modeling Dynamic Pressure Loss by Absorption in Oleo-Pneumatic Shock Absorbers without Separator

Willich,

Holzapfel,

Vrabec

2024

Preprint

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“…Using two Massachusetts Institute of Technology (MIT) test rigs (gas spring and gas spring+heat exchanger) Kornhauser 20 confirmed experimentally that there was a fundamental difference between steady and oscillatory flow heat transfer in the variable cylinder volumes of the MIT test rigs. Building on the work done by Lee, Smith, Faulkner, and Chafe 6,13,21 , Kornhauser started the development of expressions suitable for oscillating pressure and oscillating flow conditions. He closely integrated experiment with analysis to achieve useful results with good qualitative but limited quantitative success.…”

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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“…Using the two MIT test rigs Kornhauser 20 confirmed experimentally that there was a fundamental difference between steady and oscillatory flow heat transfer in the variable cylinder volumes of the MIT test rigs. Building on the work done by Smith, Lee, Faulkner, and Chafe 8,15,21 , Kornhauser started the development of expressions suitable for oscillating pressure and oscillating flow conditions. He closely integrated experiment with analysis to achieve useful results with good qualitative but limited quantitative success.…”

Section: Nasa Sti Program In Profilementioning

confidence: 99%

Entropy Generation/Availability Energy Loss Analysis Inside MIT Gas Spring and "Two-Space" Test Rigs

Ebiana

Savadekar²,

Patel³

2005

3rd International Energy Conversion Engineering Conference

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An Experimental Study of Gas Spring Heat Transfer in Reciprocating Cryogenic Machinery

Cited by 4 publications

References 0 publications

Modeling Dynamic Pressure Loss by Absorption in Oleo-Pneumatic Shock Absorbers without Separator

Modeling Dynamic Pressure Loss by Absorption in Oleo-Pneumatic Shock Absorbers without Separator

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

Entropy Generation/Availability Energy Loss Analysis Inside MIT Gas Spring and "Two-Space" Test Rigs

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