Effect of High Temperature Steam Inhalation on Aeroengine Performance

At the launch of the carrier-based aircraft by steam ejection, the high-temperature water steam can leak out and be inhaled into the aeroengine, which will affect the performance of the aeroengine. To study this issue, this paper establishes a mathematical model for small bypass ratio mixed-flow turbofan engine based on the component method. Aiming at the influence of high-temperature steam on intake properties, humidity is used to represent the water vapor content, and the physical-property data of water vapor were fitted into polynomial formulas. The properties of humid air (humid gas) are calculated with mass-weighted average of the physical properties of dry air (dry gas) and water vapor. The pressure ratio and efficiency characteristics of the compression components are modified by using similar flow rate formula and similar rotational speed formula that include physical properties. Aiming at the intake total-temperature distortion caused by high-temperature steam, the performance of the aeroengine under distorted intake conditions is calculated using a parallel compressor model in this study. The effects of intake humidity and intake total-temperature distortion on the aeroengine performance is separately calculated. Additionally, the variation in performance of aeroengine when ingesting high-temperature steam is calculated and the results are compared with the results of steam inhalation tests. The simulation results match the experimental results, which validates the reliability of the simulation.