an extending into a combustion chamber 40 defined by the combustor cap 34 and the combustor liner 24 an impingement sleeve 42 is coupled to the combustor sleeve 30 and is radially spaced from the transition piece 20 defining a transition flow channel 44 therebetween during operation discharge flow 46 flows from the compressor 12 through a diffuser 48 to the impingement sleeve 42 the discharge flow 46 proceeds through a plurality of impingement holes 50 in the impingement sleeve 42 and toward the combustor 14 in the transition flow channel 44 the discharge flow 46 proceeds from the transition flow channel 44 and through the combustor flow channel 32 until it is finally introduced to the combustor liner 24 through the at least one nozzle 38 in addition to providing air to the combustor 14 for the combustion process the relatively cool discharge flow 46 further provides much needed cooling to the components exposed to hot combustion gas for example the combustor liner 24 and the transition piece 20 at the interface between the transition piece and the combustor liner there is a telescoping fit where the aft end of the combustor liner is received within the forward end of the transition piece with reference to fig2 an annular spring finger seal 52 also known as a hula seal is located radially between the aft end 54 of the liner 24 and the forward end 22 of the transition piece 20 typically the spring fingers 56 have uniform widths and extend from a solid end or edge 58 of the seal in an axial direction uniformly spaced about the circumference of the seal edge separated by slots 60 as best seen in fig3.