Study on ignition performance of a cavity trapped vortex combustor of the afterburner with an air-blast-swirl atomizer
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摘要:
为了研究凹腔驻涡加力燃烧室的贫油点火特性，设计了一种出口为扁平状喇叭口的气旋耦合喷嘴，通过试验研究和数值仿真分析，获得了气旋耦合喷嘴的油雾锥角等特性和凹腔贫油点火特性。结果表明：气旋耦合喷嘴展向油雾锥角受气压和油压的影响较大，而径向油雾锥角基本不受影响、保持稳定。在内涵进气马赫数为0.53的条件下，凹腔在油气比
0.00179 下贫油点火成功；当外内涵压比为0.93时，凹腔内因不能形成理想涡系，不利于凹腔点火，其贫油点火油气比为0.00376 ；当外内涵压比不变时，增大进气压力，有利于凹腔贫油点火；电嘴插入深度对凹腔的点火性能影响较大，其插入深度需与气旋耦合喷嘴的径向油雾锥角匹配；凹腔前壁壁温数据可以作为凹腔点火是否成功的判据。Abstract:In order to study the lean ignition characteristics of an air-blast-swirl atomizer in a cavity trapped vortex combustor of the afterburner, an air-blast-swirl atomizer with a flat bell mouth was designed. Through test research and numerical simulation analysis, the characteristics of spray cone angle and lean ignition of the air-blast-swirl atomizer were obtained. The results showed that the spanwise spray cone angle of the air-blast-swirl atomizer was greatly affected by air pressure and oil pressure, while the radial spray cone angle was basically unaffected and kept stable; under the condition of Mach number 0.53, the cavity trapped vortex combustor of the afterburner can successfully ignite with lean ignition at the fuel air ratio of
0.00179 ; when the inlet pressure ratio of out and inner bypass was 0.93, the ideal vortex system cannot be formed in the cavity, making it inconducive to the afterburner ignition; and the lean ignition fuel air ratio was0.00376 ; if the inlet pressure ratio of out and inner bypass was constant, increasing the inlet pressure could be beneficial to lean ignition of the afterburner; the insertion depth of the igniter had a great influence on the ignition performance of the cavity, and its insertion depth was required to match the radial spray cone angle of the air-blast-swirl atomizer; the wall temperature data of the front wall of the cavity can be used as a criterion for the success of the cavity ignition. -
图 17 外内涵压比的影响
Figure 17. Influence of the inlet pressure ratio of out and inner bypass
图 18 外内涵压比对流场的影响
Figure 18. Influence of the inlet pressure ratio of out and inner bypass on flow field
表 1 油雾锥角试验工况
Table 1. Condition of spray cone angle test
工况 ∆pfuel/MPa ∆pair/kPa GK1 1 5 GK2 1 15 GK3 1 30 GK4 2 5 GK5 2 15 GK6 2 30 
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表 2 贫油点火试验工况
Table 2. Condition of lean ignition test
方案 d/mm T6/K p6/kPa Ma6 T16/K py case1 7 1200 135 0.53 500 0.97 case2 7 1200 135 0.48 600 0.97 case3 7 1200 135 0.48 600 0.93 case4 7 1200 220 0.48 600 0.97 case5 2 1200 135 0.48 600 0.97
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