F2010C081
Development of Principles and Methods of Estimation of Thermal Condition of Semitransparent Coatings in Complex Heat Exchange Combustion Chambers for Low-Heat-Rejection Diesel Engines
The paper considers a theoretical model which can be used to describe the heat transfer through semitransparent, absorbing and scattering media. The authors present the physical and mathematical models of radiative and conductive heat transfer and solution methods for a multilayered scattering and absorbing heat-insulating coating including opaque ones. Calculations of radiation field are carried out by the method of moments and defined by the solution of differential equations system for moments of radiation intensity. Infrared-optical characterizations were conducted with multibeam laser setup. Special emphasis is made on design-theoretical and experimental estimations of optical parameters of model samples of volumetric scattering and absorbing ceramic coating based on the granulated powders of the stabilized zirconium oxide (ZrO2 + 10% Y2O3). The paper describes laser stand for measuring of reflection and transmission coefficients of flat samples of semitransparent materials. Transient and steady temperature distributions and heat fluxes in model translucent and opaque materials of heat-insulating coatings are simulated. Finally, the paper examines possible applications of semitransparent ceramic heat-insulating coatings in combustion chambers of high speed diesel.
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Session: IC Engines, Goals and Development