Cooling System Improve And Numerical Simulation For The2^ND Stage Rotor Of Heavy-duty Gas Turbine

With the development of the requirements of power, environmental protection,flexibility and economy, the development of high performance turbine engine-especiallyhigh performance gas turbine-has got more attention and concern. As is known to all,improving the temperature of turbine inlet can significantly improve the overallperformance and budget of turbine, but the turbo can’t keep working in hightemperature too long because the present material cannot meet the practical needs. So,cooling methods such as air cooling system became our choice and CFD has becomeone of the good assistant methods which can help us to cut back on spending andshorten the construction period.In the following passages, numerical simulation about2nd stage rotor and thestudy on pneumatic and heat transfer was launched. After completing the preparatorywork such as building the models and generating the meshes, the analysis and contrastwork about the performance of cooling system is also completed according to a varietyof conditions. In addition to research the flow field of leaf, In this paper I also take theanalysis about the heat the strengthening effect of longitudinal vortex in turbine blade asone of the key points.By an analysis of internal flow field, the application of alternating elliptical axistube (AEA-tube) significantly decreases the nonuniformity of the cooling gas caused byCoriolis force in the original case under the influence of AEA-tube geometry featureand development along stream wise direction of longitudinal vortex; the external flowfield analysis shows that the tip shed vortex flow is basically held back, meanwhile theshed vortex is superseded by a similar shed vortex given rise to by cooling substance,effected by the tip clearance and the gas discharging of tip cooling substance; moreover,the influence of the above factors as well as main vortex structure is included in thedetail analysis of the passage.The final conclusion shows application of AEA-tube on the basis of enhanced heattransfer by longitudinal vortex theorem exhibits an apparent advantage in cutting downthe inlet pressure of cooling gas, reducing flow loss, thus requiring more uniformtemperature distribution of the external wall of turbine blade. Plus, adjusting spatialdistribution of cooling passage also contributes to controlling temperature distributionof the blade.