Heat Transfer in the Cylinder of a Motored Reciprocating Engine

Annand, W. J. D.; Pinfold, D.

doi:10.4271/800457

Cited by 37 publications

(16 citation statements)

References 4 publications

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“…This approximation of the constant temperature was made in accordance to the fact that a solid cylinder liner has a very high thermal inertia with respect to the transient changes in the gas temperature, this resulting in very small actual oscillations in the wall surface temperature. This was measured for motored piston engines by several researchers, [7] and [1], and oscillation was shown to be no more than ±3K in amplitude, which is very small compared to the amplitude in the gas temperature. Validity of this assumption was also examined by [8], and here too it was shown that the wall temperature can be regarded as constant with a view to the effect on the wall heat flux.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…1 [1][2][3]). Attempts were made and have been reported in the literature [1,3,4] to include this phenomenon in the conventional Nu-Re model by adding a complex phasing part to the bulk gas temperature -heat transfer correlation. This, however, has not led to a generically applicable correlation, but to a series of geometry-and operating conditions-specific expressions.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer and Fluid Flows in Gas Springs

Lekic¹,

Kok²

2010

TOTHERJ

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Thermodynamical processes and fluid mechanics phenomena occurring in an unlubricated piston-cylinder gas spring are investigated. Existing instantaneous heat transfer correlations are not applicable to the piston-cylinder compressed volumes. Accurate prediction of the transient thermal properties, heat transfer and fluid flows for the high performance, tight tolerance and lubricant-free gas compressors (e.g. cryo-cooling industry) is of high industrial importance.Research is here done with the use of ANSYS CFX finite-volume numerical package, modelling the closed fluid domain in a valveless non-lubricated one-piston-cylinder gas spring. Obtained numerically simulated values are compared to experimentally measured pressure and heat-flux data; very good agreement is observed. Broad discussion and conclusions with regard to thermodynamic and fluid-flow phenomena occurring are presented.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Fluid Flows in Gas Springs

Lekic¹,

Kok²

2010

TOTHERJ

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“…The bounding solids have a very high thermal inertia compared to the operating gas, and the small oscillation in the surface temperature will have negligible impact on the amplitude of the heat flux. This was also reported in earlier work, [25] and [26], in motored piston engines. In these experiments oscillation was shown to be no more than ±0.5 °C [25] to ±3 °C [26] in amplitude.…”

Section: Boundary Conditionssupporting

confidence: 89%

Fluid flow and heat transfer in a helium gas spring : computational fluid dynamics and experiments

Lekic¹

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“…Woschni [9] proposed equations to determine turbulent convective heat transfer considering average speed of in-cylinder gases and Annand [10] find correlations to calculate instant average coefficients for turbulent convection heat transfer using gas average temperature and proposed correlations to evaluate flame radiation emitted during combustion. Correlations for convection heat transfer taking into consideration surface change and cylinder enclosed volume as piston moves was established in [11].…”

Section: Introductionmentioning

confidence: 99%