Some Results of Modeling the Wet Compression Process in GTD and GTU Axial Compressors with Respect to Its Multifactorial Nature

The article presents and analyzes the results of the development and application of the methodology for structural analysis and the CompressorWI-2S program for modeling the process of wet compression of air in gas turbines and axial compressors, taking into account the multifactorial characteristics of this process. This includes the selection of the location of the liquid flow path in the compressor. liquid separation on the inner walls of its housing, the presence of an internal or external bypasses (recovery) of the two-phase compressible pressure fluid section, the possibility of injecting super-heated liquid, incomplete wetting of the surfaces of the blades of the impellers blades (IB) and stage guide vanes (SGV) of individual stages, control of the compressor operating modes at low speeds using SGV rotary blades of some stages. The simulation results of the CompressorWI-2S were based on the 14-stage axial compressor of the AL-21F-3 gas turbine engine, for which experimental and bench test data were published in the scientific literature. We were able to determine the most significant and minor factors based on the results of the calculation, which varied a few compressor parameters and the conditions of the water injection into the flow path. The characteristics of the axial compressor under wet compression have been determined by combining it with other heat and gas dynamic calculation programs for gas turbine engines. In terms of performance and flow characteristics at the compressor outlet, the simulation results are in line with the bench test and experimental data for this axial compressor. As a result of, the research, it was established that the determining role in the process of moisture evaporation in the flow section of an axial compressor is played by thermodynamic factors, such as changing pressure and temperature of the working fluid (two-phase mixture or steam-air mixture), corresponding changes in the heat of vaporization in the flow section of the compressor, as well as the liquid injection flow rate.