Influence of Different Gas Parameters on Sensitivity of Thermal Expansion Gyroscope

In this paper, the effects of gas heat capacity, thermal conductivity, viscosity coefficient and pressure on the sensitivity of thermal expansion fluid gyro were studied. The temperature field and flow field of sensing component were calculated by using COMSOL software. The flow velocity decreases with the increase of specific heat capacity, thermal conductivity of the working gas. But the flow velocity increases with the increase of pressure in the cavity. there is no significant change in flow velocity under different viscosity coefficients. The sensitivity of thermal expansion flow gyro increases with the increase of specific heat capacity of working gas and pressure in the cavity. But the sensitivity decreases with the increase of thermal conductivity and viscosity coefficient of the working gas.