| Citation: | WANG Yejun, CHEN Yang, CAI Guobiao, et al. A transient modeling method for unknown information regulating valves in complex pipeline network system[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(8): 1535-1544. doi: 10.13700/j.bh.1001-5965.2019.0486(in Chinese)
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The information missing of key regulating valve is an important factor to restrict the modeling of complex pipeline network systems. After classifying and summarizing the modeling research of regulating valves, the conclusion that the flow characteristic curves of most regulating valves are between the equal percentage and the linearity is obtained. Based on this conclusion, a modeling method by using the information-known reference-valve model and the limited system test data is proposed for the valves whose structure and throttling characteristics are unknown. Then, this method is used to establish the models of two unknown-information valves in the core engine test rig gas circuit system. The application to two working conditions including 0-1 400 s normal-temperature condition and 0-1 240 s low-temperature condition shows that the differences of the simulation curves among three different reference-valve models are less than 10%; the average errors between the flow-rate simulation curves of two regulating valves in the 47-component system and the test curves are within 15%; the maximum errors between the pressure simulation curves and the test curves at two downstream branches are within 15%. Thus, the proposed method can provide an effective modeling scheme to solve this kind of problem.
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