关键词: 燃烧室;贫油熄火;旋流器;旋向组合;叶片角度

Abstract: In order to study lean blow-out(LBO) performance of centrally-staged combustor with three-stage swirler, the LBO characteristics of the centrally-staged combustor under different inlet airflow velocity and swirler parameters of the swirler were experimentally studied and numerically simulated at atmospheric pressure, and the LBO rules under certain conditions was obtained. The test results showed that: With the increase of the inlet airflow velocity to 35m/s, the lean blow out fuel-air-ratio (θ_lbo) decreases to 0.0070, which indicates that it plays an important role in LBO performance. Theθ_lbo in reverse rotation of pilot stage (Case A is 0.0066, and the Case B is 0.0071) is less than the same rotation (Case C is 0.0078, and Case D is 0.0074), and the Case A is the smallest. It shows that the pilot stage rotation has a significant effect on the LBO performance. The LBO characteristic is the best when the pilot stage is reversed, and the primary stage rotation has little effect on it. The best combination of rotational direction is Case A, that is, the rotational direction of stage 1 and stage 2 blades in pilot is reversed, and the rotational direction of stage 2 blades in pilot is the same as that of primary stage blades. With the increase of blade angle of stage 1 and stage 2 in pilot stage, theθ_lbo decreased by nearly 4% and 9%, respectively, and the LBO characteristics became better. The numerical simulation rules are consistent with the experimental rules.