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Study of instantaneous unsteady heat transfer in a rapid compression-expansion machine using zero- dimensional k-e turbulence model | ||
| Iranian Journal of Science and Technology Transactions of Mechanical Engineering | ||
| شناسنامه علمی شماره، دوره 27، شماره 3، اردیبهشت 2003، صفحه 607-616 | ||
| شناسه دیجیتال (DOI): 10.22099/ijstm.2013.989 | ||
| چکیده | ||
| In this investigation, the instantaneous unsteady heat transfer within a pneumatically driven rapid compression-expansion machine that offers simple, well-controlled and known boundary conditions was studied. Values of the instantaneous apparent overall heat flux from the cylinder gas to the wall surfaces were calculated using a thermodynamics analysis of the experimentally measured pressure and volume temporal development. Corresponding heat flux values were also calculated through the application of a zero-dimensional k-e turbulence model. In the zero-dimensional k-e turbulence model (ZDM) the characteristic velocity is a contribution of turbulence kinetic energy, mean kinetic energy of charged air into cylinder and piston motion for the calculation of Reynolds, Nusselt and Prandtl numbers. Comparison of the zero-dimensional k-e turbulence model prediction with experimental data shows good agreement for all compression ratios (8.4~24.3). | ||
| کلیدواژهها | ||
| k-e turbulence model؛ unsteady heat transfer؛ rapid compression-expansion machine | ||
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