The Electro–Hydrostatic Actuator(EHA)is applied to drive the control surface in flightcontrol system of more electric aircraft.In EHA,the Oil-Immersed Motor Pump(OMP)serves asthe core as a power assembly.However,the ...The Electro–Hydrostatic Actuator(EHA)is applied to drive the control surface in flightcontrol system of more electric aircraft.In EHA,the Oil-Immersed Motor Pump(OMP)serves asthe core as a power assembly.However,the compact integration of the OMP presents challenges inefficiently dissipating internal heat,leading to a performance degradation of the EHA due to ele-vated temperatures.Therefore,accurately modeling and predicting the internal thermal dynamicsof the OMP hold considerable significance for monitoring the operational condition of the EHA.In view of this,a modeling method considering cumulative thermal coupling was hereby proposed.Based on the proposed method,the thermal models of the motor and the pump were established,taking into account heat accumulation and transfer.Taking the leakage oil as the heat couplingpoint between the motor and the pump,the dynamic thermal coupling model of the OMP wasdeveloped,with the thermal characteristics of the oil considered.Additionally,the comparativeexperiments were conducted to illustrate the efficiency of the proposed model.The experimentalresults demonstrate that the proposed dynamic thermal coupling model accurately captured thethermal behavior of OMP,outperforming the static thermal parameter model.Overall,thisadvancement is crucial for effectively monitoring the health of EHA and ensuring flight safety.展开更多
Motor-pump assembly is the core component of the Aerospace Electro-hydrostatic Actuator(EHA).Thus,the design of the motor pump can be very challenging under conditions of high speed and wide pressure range,especially ...Motor-pump assembly is the core component of the Aerospace Electro-hydrostatic Actuator(EHA).Thus,the design of the motor pump can be very challenging under conditions of high speed and wide pressure range,especially in particular working mediums.Our ultimate goal is to pursue better flow characteristics under a wide range of working conditions.In this paper,we built a sub-model of the main friction interfaces and a model of single-shaft coaxial motor-pump assembly adopting the method of hierarchical modeling.The experimental investigation of the output characteristics was mainly carried out in a phosphate ester medium environment.Then,the flow characteristics were compared and analyzed with the simulation results.Results indicated that the flow characteristics of the motor-pump assembly could be accurately simulated by the model and quite severe in a low speed and high-pressure environment.展开更多
为改善集成电机泵喷(integrated motor pump-jet,IMP)推进器的抗空化性能,满足推进器高临界航速的基本设计需求,应用剪切应力输运(shear stress transport,SST)湍流模型和Zwart-Gerber-Belamri(Z-G-B)空化模型,采用网格融合方法生成结...为改善集成电机泵喷(integrated motor pump-jet,IMP)推进器的抗空化性能,满足推进器高临界航速的基本设计需求,应用剪切应力输运(shear stress transport,SST)湍流模型和Zwart-Gerber-Belamri(Z-G-B)空化模型,采用网格融合方法生成结构化高质量网格,对自行设计的IMP推进器进行空化性能数值预报。分析计算结果可得:空化发生时,效率比未空化时有明显的降低,且定转子叶片空化的产生与发展及其压力系数分布皆与空化现象吻合;转子叶顶区域压力面与吸力面之间存在一定的压力差,会在转子叶顶区域出现顶隙涡流,从而进一步降低推进器的效率;当发生轻微的空化时,空化促进叶片涡的强度提升,涡量值会更高,且空化时的涡核内部压力比未空化时小。该研究结果可为未来IMP推进器的性能优化设计提供一定参考。展开更多
基金supported by the National Key R&D Program of China(No.2021YFB2011300)the National Natural Science Foundation of China(Nos.52275044,U2233212)。
文摘The Electro–Hydrostatic Actuator(EHA)is applied to drive the control surface in flightcontrol system of more electric aircraft.In EHA,the Oil-Immersed Motor Pump(OMP)serves asthe core as a power assembly.However,the compact integration of the OMP presents challenges inefficiently dissipating internal heat,leading to a performance degradation of the EHA due to ele-vated temperatures.Therefore,accurately modeling and predicting the internal thermal dynamicsof the OMP hold considerable significance for monitoring the operational condition of the EHA.In view of this,a modeling method considering cumulative thermal coupling was hereby proposed.Based on the proposed method,the thermal models of the motor and the pump were established,taking into account heat accumulation and transfer.Taking the leakage oil as the heat couplingpoint between the motor and the pump,the dynamic thermal coupling model of the OMP wasdeveloped,with the thermal characteristics of the oil considered.Additionally,the comparativeexperiments were conducted to illustrate the efficiency of the proposed model.The experimentalresults demonstrate that the proposed dynamic thermal coupling model accurately captured thethermal behavior of OMP,outperforming the static thermal parameter model.Overall,thisadvancement is crucial for effectively monitoring the health of EHA and ensuring flight safety.
基金This study was co-supported by the Chinese Civil Aircraft Project(No.MJ-2017-S49)China Postdoctoral Science Foundation(No.2021M700331).
文摘Motor-pump assembly is the core component of the Aerospace Electro-hydrostatic Actuator(EHA).Thus,the design of the motor pump can be very challenging under conditions of high speed and wide pressure range,especially in particular working mediums.Our ultimate goal is to pursue better flow characteristics under a wide range of working conditions.In this paper,we built a sub-model of the main friction interfaces and a model of single-shaft coaxial motor-pump assembly adopting the method of hierarchical modeling.The experimental investigation of the output characteristics was mainly carried out in a phosphate ester medium environment.Then,the flow characteristics were compared and analyzed with the simulation results.Results indicated that the flow characteristics of the motor-pump assembly could be accurately simulated by the model and quite severe in a low speed and high-pressure environment.
文摘为改善集成电机泵喷(integrated motor pump-jet,IMP)推进器的抗空化性能,满足推进器高临界航速的基本设计需求,应用剪切应力输运(shear stress transport,SST)湍流模型和Zwart-Gerber-Belamri(Z-G-B)空化模型,采用网格融合方法生成结构化高质量网格,对自行设计的IMP推进器进行空化性能数值预报。分析计算结果可得:空化发生时,效率比未空化时有明显的降低,且定转子叶片空化的产生与发展及其压力系数分布皆与空化现象吻合;转子叶顶区域压力面与吸力面之间存在一定的压力差,会在转子叶顶区域出现顶隙涡流,从而进一步降低推进器的效率;当发生轻微的空化时,空化促进叶片涡的强度提升,涡量值会更高,且空化时的涡核内部压力比未空化时小。该研究结果可为未来IMP推进器的性能优化设计提供一定参考。
