Performance Prediction of Scramjet Driven DCW MHD Generator with Three-Dimensional Analysis

摘要

Scramjet-driven air borne MHD channels for hypersonic vehicles have been designed with the one-dimensional analyses, and the designed channels are examined in detail with the three-dimensional analyses. As a result, two MHD channels of which electrical power output exceeds l2MW have been designed. The length of one channel is 0.80 m, where the constant velocity is assumed, whereas the other channel has a length of 0.84 m, where the velocity distribution is made similar to the Lytec design. Influence of changing the load current on the obtained channel length becomes very small in the region less than 45 degrees of the diagonalization angle, and therefore the diagonalization angle of 45 degrees is selected for the design. Three dimensional calculations show that the expansion waves are generated on the walls near the connection region of front duct and MHD channel, whereas the compression waves are induced on the walls near the connection region of MHD channel and rear duct. It is also shown that the electrical conductivity corresponds strongly to the distribution of static temperature.