Study on critical enthalpy extraction ratio and numerical validation for magnetohydrodynamic inlet

To ensure that the magnetohydrodynamic (MHD) inlet works in starting state, the concept of critical enthalpy extraction ratio was proposed for the MHD inlet. The quasi-one-dimensional model for the critical enthalpy extraction ratio state of MHD inlet was analyzed using the turbojet engine model, the variable cross-section pipe flow theory and the expressions of modified polytropic efficiencies. By comparison of this model with the computational fluid dynamics (CFD) method, the results show that this model fits good, and the error is less than 5.7%, thus providing a reference for design of the MHD inlet.