一种新型微热流陀螺仪的结构参数研究

提出了一种基于双向流体检测角速度的微热流陀螺仪.不同于射流偏转工作方式,它采用对称分流通道结构,利用哥式力引起对称分流通道的流量不同,导致流体与布置于分流通道内的热敏器件对流传热不同,通过检测热敏器件的温差获得角速度.采用计算流体动力学(CFD)模型计算并分析了不同结构参数(主通道长、宽、高,主通道张角,两分流通道角度,拐角的过渡圆弧,分叉尖角的圆弧倒角)对检测灵敏度的影响.结果表明使流体速度充分偏转和减小分流通道流动阻力有利于提高检测灵敏度.

Structural parameters study on a novel micro thermo-fluidic gyroscope

A novel micro thermo-fluidic gyroscope utilizing dual directional liquids was proposed.Compared with jet deflection method,the proposed gyroscope comprises two pairs of symmetric microchannels splitting from main microchannel.When the Coriolis force induced by external rotation acts on the fluid,mass flow rate of the symmetric microchannels will be unequal,which results in different thermal convections between the fluid and thermistors inside split microchannels.Through measuring the temperature difference between the symmetric thermistors,angular rate is obtained.The influence of different structural parameters(length,width and depth of main microchannel,splay angle of main microchannel,angle of split microchannels,fillet of corner and fillet of split) on the sensitivity of gyroscope was numerically simulated and analyzed by computational fluid dynamics model.The results show that enough deflection of the velocity of fluid and decrease of the flow resistance of split microchannels can improve the sensitivity of the proposed gyroscope.