| Citation: | GE Shenghong, CHENG Wenhao, XIE Zhangchen, et al. Mathematical modeling and experimental study of flow force in the prestage of deflector-jet servo valve[J]. Journal of Aerospace Power, 2025, 40（1）：20230213 doi: 10.13224/j.cnki.jasp.20230213
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The fluid flow force on the deflector is of great significance for analyzing the vibration and whistling faults of the deflector-jet servo valve. The existing models of fluid flow force only consider the jet impact force while neglecting the static pressure on the walls of the V-shaped groove. For this, it was proposed that the fluid flow force was mainly composed of two parts: the impact force generated by the oil impacting the walls of the V-shaped groove in the primary jet phase, and the static pressure on the walls of the V-shaped groove in the pressure recovery phase. Based on the mass conservation law, the momentum conservation law, and the continuum hypothesis, the variation of jet impact force and static pressure with aspect to the deflector displacement was investigated, and a novel mathematical model of flow force was derived. Then, experiment and CFD simulation for the pressure characteristic of the deflector-jet amplifier were conducted to verify the accuracy of the proposed flow force model. The results showed that the larger deflector displacement indicated the larger difference of pressure area between the two sides of the V-shaped groove, and the more obvious effect of static pressure on the flow force. Validated by the CFD simulation, the mathematical model of high accuracy can provide the theoretical support for the vibration and resonance analysis of deflector-jet servo valve.
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