| Citation: | CHEN Qifei, LIU Shijie, CHEN Shuwei, et al. Fluid-heat-solid coupling numerical study on influence of gas-solid two-phase flow on elbow tube of gas-steam ejection power system[J]. Journal of Aerospace Power, 2022, 37（11）：2668-2679 doi: 10.13224/j.cnki.jasp.20220510
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In order to study the influence of particles on the elbow tube, the particle track model was used to calculate the gas-solid two-phase flow in the elbow tube, and the fluid-thermo-structure coupling model was applied to calculate the thermal response of the elbow tube under the two-phase flow. Finally, the influence of the particle size was studied. Results showed that solid particles were gathered on the region outside of the elbow tube near the outlet, such that the temperature and plastic strain of the inner wall at the gathering region rose about 280 K and 60%, with the corresponding local fatigue life decreasing by 48%. Particle size affected the aggregation location and concentration of solid particles, as well as the temperature and plastic strain of the wall near the aggregation location. As the particle size increased, the average volume fraction of the aggregated particles increased and then decreased, resulting in an increase and then a decrease in the internal wall temperature and plastic strain at the gathering region, with the opposite change in local fatigue life. These three quantities reached extreme values when the particle size was around 8µm, with 1042 K, 0.016697 and 244 cycle lives in that order.
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