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the swirlers to reduce the high gas temperature immediately after burning. Brown Boveri’s GT-8 was equipped with this type of combustor in 1988 along with several other BBC gas turbine engines [9]. Results showed that 70 ppm NOx was generated at the exit which showed that first, combustion was still taking place near stoichiometry conditions and second, the short residence time was not quite enough for bringing down the NOx levels. Alstom also introduced annular premix combustor in GT13E2 (shown in Figure 1) in which multiple singular burners are distributed along the turbine entry circumference. This arrangement has several advantages including an automatic cross ignition along the burners, the possibility to run with some burners turned off, and highly uniform gas temperature at turbine inlet. EV burner introduced by Alstom1 and first applied to GT11 in 1993 uses the vortex breakdown of a strongly swirling flow to stabilize the premix flame [27]. As shown in Figure 13, the EV burner consists of two half cone shells with an offset to each other in order to create a tangential slot for air and fuel. The swirl strength of the air flow increases in axial direction in a way that vortex breakdown occurs near the exit of the burner. Upstream of the vortex breakdown, the core flow is strongly accelerated which creates a barrier against flashback. Downstream of the vortex breakdown an inner recirculation zone is created which plays an important part in stabilizing the flame. Modern versions of EV burner have brought down the NOx and CO emissions to very low levels (25 vppm NOx) [9]. 1 Former Brown Boveri (BBC), now GE-Alstom. 22PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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