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Figure 22 shows the numerical domain for this configuration. In this design swirlers are placed right before the stator blades injecting fuel and air into the blade channels. The swirler is positioned in the middle of two adjacent blades, thus minimizing direct interaction between the flame and stator blades. Figure 23 shows a sample single- stage turbine with the current configuration. IV.4. Mesh Generation The grids are generated using the commercial software ANSYS ICEM CFD 17.1. Each stator, rotor, or injector component is treated as a separate unit in the grid generation process. For the stator and rotor units, fully structured hexahedral grids are generated as shown in Figure 24a. They incorporate boundary layer (BL) grids near the blade and hub and shroud surfaces. BL grids near the blade leading and trailing edges are shown in Figure 24b and Figure 24c, respectively. Based on the utilized turbulence model (SST) and the mainstream Reynolds number (RE=2.8E6), the corresponding y+ value of the first boundary layer node is kept in the order of 1 over all of the blade surfaces. Inside the boundary layers, between 16 to 22 nodes are distributed with a growth factor of 1.1 to 1.2. For the injector components, a tetrahedral grid with hexa core is generated as shown in Figure 24d. In this type of grid, fine tetrahedral elements are generated near the injector surfaces and domain boundaries, and they are combined with a hexahedral grid in the main domain. Meshing strategy and parameters are based on many previous studies [77]-[87]. A grid study is performed on the single stage turbine with injector configuration type 1 to evaluate grid independency of the simulation results. The grid is refined until the 47PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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