The Impingement Cooling Effect Of Pin Fin In Double Chamble Model

With the constant improvement of the gas turbine power, the temperature of the turbineincreases too,this means that high temperature parts include the gas turbine combustortransition sectionand so on, will bear more and more high temperature. In the research ofthe development of the current high temperature resistant materials, there is a huge contrastwith the improvement of gas turbine power. Thus the cooling technology of the gas turbinecombustor transition sectionare in urgent need of improvement. At present, for the type ofcooling of the gas turbine transition section, we usually adopt impingement cooling. At thesame time, cooling fins also has been used for the cooling of turbine blade. So this article isbased on the above two kinds of different cooling ways in different high temperature of gasturbine’s cooling efficiency, putting forward that we can study the impingement coolingeffect pin-fin by adding the half pin-fin. Model used in this article is modified on the basisof the gas turbine transition section, getting simplified double chamber model, then addingthe pin-fin in the cooling chamber, by analyzing the distribution of the flow field, thermalfield and pressure field of he transition section, to study the influence of the pin-fin’sparameters on impingement cooling. The main contents are as follows:Firstly, in order to reaearch on the effect of pin-fin diameter to the single air impingingcooling, in the page three different diameter models are set up. The realizable k turbulence model of FLUENT is choosed to simulate the flow field, accoring to the result ofthe simulation, then have a heat-fluid coupling analysis. The result reveal that if thediameterof the pin-fin is larger,the effect of the single air impinging cooling will be better,the large size of the pin-fin diameter can greatly improve the cooling efficience.Secondly, at the base of the model with the best cooling efficience of the single air impinging cooling through the study of the pin-fin diameter, change the distance betweenthe pin-fin and the impinging hole to sthdy how the distance impact the cooling efficience.The result reveals that the effect of the distance is not absolute.Finally, two different structure of the model is used to research the effect of pin-fin todrop/air composite cooling,and using the discrete phase model of FLUENT softwaresimulation, we can found that the model of adding pin-fin structure to the velocity directionof droplet can play a change role, which enhances the effect of the droplet/air compositecooling.