1. 0'2500 2800 3100 7*TFig. 3.22 Dependence of the optimum flow rate factor on the stagnation temperature at various values of the isotropic index (ideal MHD channel); 1 - 43/41; 2 - 23/21; 3 - 15/13; 4 - 5/3 3000 K, characteristic of the stagnation temperature in power generating open-cycle MHDgenerators, at k = 1.1, assuming an ideal MHD channel, XDt= 1.7-2. This result is on good agreement with the results of analysis of other authors (e.g. [8]).
2. 3. U,UU^ UA Fig. 3.23 The influence of the nonideal behavior of insulation and the thickness of the boundary layer on the optimum flow rate factor in an MHD channel, (a) and (b),respectively, at different degrees of plasma conductivity nonuniformity (TTo= 2700 K, ^ = 3) 1 - Tw=0.6;2 - 0.8;3 - 1
4. At such ftp, even a relatively small deviation from ideal behavior of insulation leads to a considerable drop int.t. When or™ = 0.01, the optimal flow rate is approximately 1-1/2 times lower than in the ideal case. In the case of hot channel walls, plasma conductivity nonuniformity leads to approximately the same drop of \t. However, even in thecase of hotchannel walls, the nonuniformity of plasma conductivity exerts considerable influence on XDpt(up to 20 %), even though, in this case, the nonuniformity factor is 40 to 50 times smaller than it is for semi-hot walls, and does not exceed 0.01-0.015.