respectively . This sensitivity of the width of the Mach disk to NPR in comparison to its height . The correlation suggested by Antsupov 27 ] , equation ( 4 , was also used to estimate the width of Mach disk and values of 1 065 NPR of8.5 and 30 , respectively According current LES predicted Mach disk width very close to equation ( 4 ) 10 , whilst for NPR - 30 a value higher by was predicted by LES . Reordering for the coeffi cient ζ and using values width tained from the estimated to be - 0.80 and - 1.1 for NPR of 85 , 10 , and 30 , respectively