# Combustion chamber heat rejection modelling

 dc.contributor Aalto-yliopisto fi dc.contributor Aalto University en dc.contributor.advisor Norling, Daniel dc.contributor.author Kartavtseva, Anastasia dc.date.accessioned 2014-10-03T07:11:18Z dc.date.available 2014-10-03T07:11:18Z dc.date.issued 2014-08-25 dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/14086 dc.description.abstract The overall goal of this Master thesis is to understand the process of heat rejection from the combustion chamber of diesel engine to the cooling oil and the influence of thermal barrier coating to the reduction of heat losses through a piston wall. Two types of TBC are analysed in this project ceramics and air layer. In order to do that 1D conduction model is developed in MATLAB. The model is based on one dimensional conduction equation with boundary conditions considering convection on the left side and constant temperature of the cooling oil on the right side. en Partial differential equation is discretized using finite difference method. Boundary conditions model in this thesis is a separate function which provide gas temperature and convective heat transfer coefficient to the main model. Woschni correlation is used to obtain heat transfer coefficient since it seems to be accurate enough and demonstrates good results during the model validation. Different simulations are performed using the model where the influence of thickness and thermo-mechanical properties of thermal barrier coating to the heat flux rejected from the combustion chamber is investigated. The most important properties of ceramics influencing heat flux are heat conductivity, specific heat capacity and density. Among other engine parameters varied in this project are engine speed and burn duration. As the conclusion to the project economical justification is presented showing the potential of thermal barrier coating for the improvement not only thermal efficiency but also the cost reduction of the engine operation. dc.format.extent 57 + 9 dc.language.iso en en dc.title Combustion chamber heat rejection modelling en dc.type G2 Pro gradu, diplomityö en dc.contributor.school Insinööritieteiden korkeakoulu fi dc.subject.keyword diesel engine en dc.subject.keyword modelling en dc.subject.keyword heat losses en dc.subject.keyword thermal barrier coating en dc.subject.keyword combustion. en dc.identifier.urn URN:NBN:fi:aalto-201410042705 dc.programme.major Innovative and Sustainable Energy Engineering fi dc.programme.mcode IA3025 fi dc.type.ontasot Master's thesis en dc.type.ontasot Diplomityö fi dc.contributor.supervisor Järvinen, Mika dc.programme Master’s Degree Programme in Energy and HVAC Technology fi
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