Two-Dimensional MHD Channel Design and Sectional Optimization with Physical Constraints

摘要

Two points important to the progress of MHD channel modeling are discussed: the capability of designing an MHD channel by using a two-dimensional model, and the optimization of the power output of the channel by using a sectional optimization procedure. Three design modes of operation, the velocity, Mach number, and pressure modes, are developed. For the same operating conditions, the results of these modes are in excellent agreement with the results obtained with the original design, where the area is specified (area or off-design mode of operation). In regard to optimization, the effects of combustor pressure, Mach number, channel length, load factor, and magnetic field strength on the performance of a Faraday channel are investigated. The effects of parameters such as load current and diagonalization angle are investigated, also, for a diagonal channel. Physical constraints, such as diffuser exit pressure, maximum allowable Hall field, and current density, are imposed on the problem. The results show that the physical constraints play an important role in the optimization of MHD channel performance. The optimization process can also identify the optimal variation of design parameters along the channel for maximum output power yield. (ERA citation 03:050534)