| Citation: | ZHOU Deqing, JIAN Yuhao, ZHANG Wenbo, et al. Optimization of the special-shaped relief groove structure of fuel gear pump based on multi-cavity lumped parameter model[J]. Journal of Aerospace Power, 2026, 41（5）：20250201 doi: 10.13224/j.cnki.jasp.20250201
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The design and optimization of the new high-efficiency relief groove is an effective measure to alleviate the drastic fuel trapping problem of aviation fuel gear pumps due to high speed, high pressure and high temperature. A research method of fuel gear pump relief groove structure optimization based on multi-cavity lumped parameter model was proposed, which introduced a lumped parameter framework to establish a multi-cavity performance model of the fuel gear pump; and a comparative analysis of the working performance of two typical and special-shaped relief grooves was conducted to determine the direction of the optimization of special-shaped relief grooves; and a multi-objective performance optimization of the structural parameters of the special-shaped relief groove based on the optimization engine of the neural network coupled genetic algorithm was carried out. The fuel trapping characteristics of the relief groove before and after optimization were compared in simulation. The results showed that: the constructed multi-cavity lumped performance model of the fuel gear pump had high simulation accuracy, and the error between the simulation results and the experimental results was within 5%; the ability of the special-relief groove to inhibit cavitation and alleviate the flow pulsation was remarkable, and the outlet flow pulsation decreased by about 20%. Compared with the original relief groove, the optimized relief groove had basically the same outlet flow quality and the peak pressure in the fuel-trapped area of the tooth cavity was reduced from 12.49 MPa to 10.52 MPa, a decrease of about 15.77%, which had a better working performance and can significantly alleviate the adverse effects caused by the fuel trapping.
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