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International Conference on Computer Simulation in Physics and Beyond IOP Publishing IOP Conf. Series: Journal of Physics: Conf. Series 1163 (2019) 012022 doi:10.1088/1742-6596/1163/1/012022 Figure 4. Computational domain for gasdynamic analysis of turbine impeller. High demands are imposed on the accuracy of the calculation, in particular, on the density of the finite element grid. A regular hexagonal finite element grid is used to solve this problem. The number of elements in the domains is chosen with a minimum loss of accuracy (less than 1% compared to the smaller grid). For the domain 3 no more than 1 million cells are enough. The solution of the developed model was carried out using Ansys CFX. The convergence criterion is the minimum change of the total temperature on the output surface. As a result, distributions of pressure, velocities and temperature in the computational domain were achieved. Gasdynamic parameters in the flow section are presented in table 1 and also comparison of results of gasdynamic analysis of flow sections in the initial prototype and modified turbine impeller. Table 1. Comparison of gasdynamic parameters of flow sections in initial turbine and modified one. Initial turbine Modified turbine Parameter Gas flow rate (kg s-1) Full temperature (K) Power (kW) Ratio of expansion Adiabatic efficiency in turbine impeller Adiabatic efficiency in turbine stage S2 inlet 0.294 1100 R3 outlet 0.294 839 S2 inlet 0.294 1100 R3 outlet 0.294 839 3.34 0.941 0.922 91.8 3.33 0.943 0.923 91.7 Analysis of obtained parameters showed, that modified turbine has quite close parameters comparing with initial one’s. Because of a modification and a turn of blade inlet profile, there is an blow and jet separation on the inlet edge of blade. That’s why adiabatic efficiency slightly reduces (0,1-0,2%). But designed impeller provides initial parameters of gas flow rate, ratio of expansion and power and also satisfies strength requirements. 5. Validation of results To verify and confirm the obtained calculated data on the basis of JIHT RAS, a stand of physical gasdynamic experiment was developed and installed [7]. The creation of such a gasdynamic stand allows for the implementation of a new technology for the study of impeller machines. This 5PDF Image | Development of radial turbines in low power Gas turbine engines
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