Investigation on the influence of gas temperature characteristics for engine combustion chamber on plasma jet deflection with MHD control

This paper is devoted to investigating the influence of gas temperature on plasma jet under magnetic control. The combustion temperature and the conductivity of the chemical equilibrium state were calculated by using a numerical method. K2CO3 was selected as the ionization seed. The characteristics of gas plasma in ionization were compared for methane/air/K2CO3 and acetylene/air/K2CO3 combustion schemes. The results showed that the acetylene/air/K2CO3 combustion scheme can obtain higher gas temperature and conductivity. The functional relationship between the conductivity and the gas temperature is fitted in polynomial form. The experiments on the deflection of plasma were carried out on the combustion and flow control test rig at temperatures of 1600–2500 K and in a magnetic field of intensity 0.6 T. The effect of jet deflection was analyzed from macroscopic and microscopic points of view. When the gas temperature increases, the ionization degree increases, the positive Lorentz force in ions increases, and plasma jet deflection becomes more obvious. The Lorentz force on the positive ion determines the effect of plume deflection. The calculated and experimental results indicated that the high temperature condition is very helpful to improve the characteristics of gas plasma in ionization. The results provide references for corresponding experimental research.