基于运动法的航空发动机高速燃油齿轮泵卸荷槽设计与验证

The inherent oil trapping problem of gear pump becomes more and more serious because of high pressure，high speed and high temperature. The traditional relief groove design method has been difficult to meet the design requirements of high-performance fuel pump. For this reason，a design method of relief groove is pro⁃ posed based on motion method，and the effects of gear parameters on the performance of trapped oil are analysed from a global perspective of the whole pump，based on the constructed trapped oil model，and then the gear pa⁃ rameters are determined to provide constraint conditions for further design of relief groove. Then，the design of re⁃ lief groove of a certain type of fuel gear pump is studied based on the law of gear motion and the design principles of relief groove. Through the flow field simulation method，the oil trapping characteristics of the new relief groove and the traditional structure relief groove are simulated and compared under multiple working conditions. Finally，the effectiveness of the design method of the relief groove is verified by the prototype test. The research results show that：compared with the traditional rectangular relief groove，the maximum trapped oil pressure under the same working conditions is reduced by 63.4 MPa，the flow pulsation rate is reduced by 33.5%，the cavitation ar⁃ ea is smaller，and the working performance is better. These improvements can significantly alleviate the adverse effects of trapped oil. The gear pump has high volumetric efficiency and long-term anti-cavitation ability with new relief groove.