衔铁偏心对高速电磁阀全工况电磁力的影响

高速电磁阀(HSV)是电控燃油喷射系统的关键部件,其衔铁偏心作用是影响高速电磁阀静、动态特性的重要因素.为了揭示高速电磁阀衔铁偏心作用对其全工况电磁力的影响规律,结合试验和数值模拟方法,建立了高速电磁阀有限元仿真模型,并通过与试验电磁力对比验证了其精度,最大误差为4.8%;分析了衔铁中心偏移和偏转及其交互作用对高速电磁阀电磁力的影响.结果表明:随着衔铁中心偏移率增大,轴向电磁力逐渐变小,而径向电磁力逐渐增大,但总体对电磁力的影响不显著;随着衔铁中心偏转角增大,轴向电磁力近似呈线性下降,轴向电磁力最大降低率为59.5%,而径向电磁力虽然逐渐增大,但增幅不明显;衔铁中心偏移与绕偏移方向偏转交互作用对轴向电磁力的影响最显著,全工况下该交互因子与轴向电磁力的相关系数绝对值最小为0.471,最大为0.624.

推力矢量喷管设计与气动特性分析研究

二元矢量喷管结构简单,隐身特性好,在多种隐身飞机上得到了应用。发展了一种"圆转方"二元喷管型面设计方法,基于此方法设计了二元喷管和两型矢量喷管。一型通过二元喷管壁面几何偏转实现,另一型由塞式中心体偏转实现。数值模拟了"圆转方"喷管以及这两型矢量喷管的内外流场。对其推力系数、流量系数、有效推力矢量角等性能参数进行了计算和分析对比,给出了对二元矢量喷管设计具有参考价值的推力矢量角的影响因素及其影响规律。

Technical Study for Inflector and Central Region of High Intensity Central Region Model Cyclotron

The central region model (CRM) cyclotron is the experimental platform for the key technology study of a high intensity beam cyclotron.In this paper we introduce the spiral inflector and central region designed for the CRM cyclotron,including the physical design,the numerical control machining and the installation precision control techniques.The shape of electrodes is complex,and machining with a strict tolerance must be done by a numerical control machine tool with the number of its axles no less than 4.The electrodes of central region were finished by using 3-axle machine tools.The size of gaps between the ground and Dee tip is very important,a special device was made to guarantee the installation precision,and the error of gaps was controlled within±0.05mm.