Similarity parameters for the escape of a strongly underexpanded jet into a flooded space

Free underexpanded jets in a quiescent medium: A review

“…Concerning the results given in function of η e [56,30,68,72,76,57,43,105,129,121,91], presented in Fig. 11, it is worth mentioning that pressure ratios tested are really narrower than before and, in the same time, discrepancies between the measurements are also more important.…”

“…If we now consider the measurements expressed in function of η e [29,56,30,68,69,72,75,76,126,125,12,57,78,82,83,43,105,129,121,89,91], the behavior of the position is now less clear, as shown in Fig. 9.…”

“…This is certainly the most studied feature in the literature, be it experimentally [12,30,35,40,43,49,51,[56][57][58][59]62,64,, theoretically [13,29,67,76,78,[95][96][97][98][99][100][101][102][103][104][105][106][107][108][109] or numerically [14,20,22,34,41,59,63,75,81,82,84,91,[110][111][112][113][114][115][...…”

“…Diameter of the intercepting shock: More studies have been dedicated to this feature, both experimentally [56,[69][70][71]123], theoretically [69,70,72,99,76,139,100,102,140,105,128,107] and numerically [141,137,138,112,117,118,84]. Surprisingly enough, the available data are quite poor and one may only say that it seems to be also dependent on the square root of the pressure ratio [69,70,123]; may sometimes depend on the convergence angle [68,70,117] even if it is not the case for some configurations [56,70].…”

“…Among the huge amount of studies, it appears that the Mach disk location is mainly governed by the pressure ratio [29,30,62,[67][68][69][70]72,[74][75][76][124][125][126][127][128][129]12,57,78,64,81,43,105,[83][84][85][86][87]121,[89][90][91][92]109 independent of the fluid [67,74,78,83,43]; not clearly influenced by the exit nozzle angle since some studies show no noticeable effects [62,[68][69][70]74,78] while others present some influence [29,56,30,126,…”