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is the most critical one with regards to the flame stability since it has the lowest temperature among the three combustion stages. As the gas moves on along the turbine stages and reaches the second and third injectors, the average approach stream Mach number increases to about 0.2. Although the higher Mach number provides a lower stability margin, but with the incoming temperatures of above 1200 K at the second and third injectors, the combustion process will most likely be stable (according to similar studies [60]). The next noticeable parameter in Figure 56 is the clocking of the injectors and turbine stator blades. Wakes from the upstream injectors impinge on the following injectors and stator blades. In conventional gas turbines, clocking (indexing) is considered a way of influencing the flow by changing the circumferential position of rotor-rotor rows and stator-stator rows relative to each other [94]. It has been shown that clocking can affect the turbine efficiency by up to 1% [95]. This efficiency variation is called clocking effect. In UHEGT, clocking concept could be extended to define adjusting of the circumferential location of the injector rows with regards to each other and the following stator blades. Therefore, it is considerable from two aspects: the first is how the two adjacent injector rows are clocked relative to each other; and the second is how the injectors are clocked relative to the following stator rows. In the current design, the two injector rows in each stage are aligned in a way that the wakes from the first row do not impinge on the injectors in the second row. This prevents the wakes from being combined with each other which could contribute to increasing losses. It would cause stronger wakes approaching the stator blades generating stronger secondary flows and separations. The second aspect is the 88PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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