| Citation: | LI W Q，WANG B，YANG J J，et al. Contamination lock characteristics analysis of fuel metering unit based on OMEGA theory[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（10）：3433-3442 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0510
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To quantify the impact of contamination particles on the operational characteristics of a fuel metering unit (FMU) and to explore an analytical method for the contamination lock characteristics of non-standard fuel components, OMEGA theory was applied to translate the effect of these particles into lock forces on fuel components. A dynamic model for the components and units under fuel contamination conditions was developed. The operational characteristics of an FMU using class GJB 420B-7/8/9 fuel were simulated, and the effects of each fuel class on key components were analyzed. The results show that the load flow response from the servo-valve contamination lock model aligns closely with the standard servo-valve lock model. The maximum lock force of the metering valve reaches 140 N for class GJB 420B-9 fuel. The response time is more than twice as long as that under non-contaminated conditions, and the maximum relative error in the metered fuel increases by a factor of more than four. The method proposed in this paper provides a valuable reference for modeling contamination lock effects in non-standard fuel components and systems.
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