| Citation: | ZHANG Jianping, ZHANG Song, DAN Zhihong, et al. Analysis on influencing factors of flow coefficient for the large-diameter butterfly valve[J]. Journal of Aerospace Power, 2025, 40（1）：20220433 doi: 10.13224/j.cnki.jasp.20220433
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The flow characteristics of large diameter butterfly valves are one of the foundations for fast and steady control of air-in total pressure, air-in total temperature, and air-out static pressure in aero-engine altitude simulating test. The numerical simulation was adopted to accurately describe its flow characteristics. The influences of pressure ratio, opening angle, valve diameter, and valve upstream static pressure on flow coefficients of large diameter butterfly valves were researched. The results showed that the flow coefficients firstly increased then remained constant with decrease of pressure ratio. And it had a critical pressure ratio. The inherent flow characteristics of large diameter butterfly valves had approximately equal percentage. The flow coefficients decreased sharply at the beginning, then slowly along with the opening angle. The influences of valve diameter and valve upstream static pressure were smaller and can be ignored. On this basis, the influence significance of pressure ratio, opening angle, and valve diameter may be obtained. The primary and secondary order was opening angle>pressure ratio>valve diameter. The response surface analysis showed that there were significant interaction influences on the flow coefficients between pressure ratio and opening angle. And the flow coefficients varied dramatically when the opening angle was equal or lesser than 55° and pressure ratio was above or equal 0.62, indicating the adjustment sensitivity of the large diameter butterfly valves was good. Finally, the table on flow coefficient of large diameter butterfly valve was obtained on the basis of pressure ratio and opening angle. Using the test results, the maximum relative errors of the simulated values and the corresponding test values were 5.07%.
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