789262.fig.0011a
(a)
789262.fig.0011b
(b)
Figure 11: (a) Comparison of free flame combustion (left) and flameless combustion in porous reactor (right); (b) explanation of operation of porous reactor with flame stabilization using a pore size gradient: 1-fresh mixture; 2-combustion reactor; 3-flame stabilization zone (small pores); 4-heat radiation; 5-flame stabilization plane; 6-exhaust gases.