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The thermos-hydraulic analysis gives the maximal airfoil temperature of Тmax=1034 °C in the mid-span trailing edge station (Fig. 5(b)). The HN70U material maximal operating temperature is 1100 °C with short time heating up to 1150 °C. Thus, the vane airfoil thermal stress level is acceptable and the cooling system fulfills its function. (а) hydraulic analysis results (b) temperature distribution in the vane mid-span station FIGURE 5. Computer simulation results of the first vane thermal state CONCLUSIONS 1. Review of power production cycles with zero emission shows that the Allam cycle is one of the most prospective technologies due to its high efficiency and low installed power price. 2. Design of new turbines on supercritical carbon dioxide requires the methods integrated from steam and gas turbine design. Development of the large power facility for the non-traditional working fluid requires approvals of the traditional solutions applied in design of steam and gas turbines. 3. The Allam cycle turbine has a small volumetric flow capacity, so in its flowpath design it is reasonable to apply the design methods used for the high pressure turbines of supercritical and ultra-supercritical steam turbines. The constant blade root diameter flowpath, similar to the high pressure supercritical turbines, allows acceptable span and diameter of the first stage blade. 4. The flowpath design shows specific features and factors that influence the turbine technical, financial, dimensional and mass parameters. The optimization analysis results include the stages number and performance. 5. For the main turbine assemblies are shown the cooling necessity and the coolant supply paths. The working fluid is a part of carbon dioxide flow upstream the turbine and downstream the recuperator. 6. Development of the turbine airfoil cooling shows that the convective cooling may be applied. Calculations show the possibility to use the materials mastered in turbomachinery. 020018-6PDF Image | design approach for supercritical CO2 gas turbine
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