Numerical studies of magnetohydrodynamic gas jet deflection considering gas parameters

The alkali metal is injected as ionized seed into the high temperature gas to obtain thermal weakly ionized plasma. The channel is exposed to an external electromagnetic field oriented so that the induced volumetric force act on the ionized gas, thereby the gas flow can be controlled, acceleration, deceleration or deflection, which is called magnetohydrodynamic method. In this process, the conductivity of gas is a very important parameter. According to gas parameters, such as temperature, pressure and species fractions, which are solved by Gibbs free energy minimization method, the conductivity of gas can be calculated. Two-dimensional magnetohydrodynamic channel is established, and the Navier-Stokes equations coupled with electrical-magnetic source terms, potential equation, and generalized Ohm's law are numerically solved to investigate the deflection of different gas parameters. The results show that injecting alkali metal into high-temperature gas will significantly improve its conductivity, the value of which can be calculated by chemical equilibrium method. At different temperatures, gas jet will deflect under the influence of electromagnetic field, which is more significant with the increasing temperature. For this model, velocity angle is closed to 20^◦ when the gas temperature is 2900K. Comparing with hydrogen and methane, the conductivity of kerosene is higher at the same temperature.