斜流驻涡燃烧室是将驻涡稳焰燃烧技术应用在斜流燃烧室的一种新型燃烧室构型。与常规斜流燃烧室相比，具有火焰筒内部涡系流场结构复杂，冷却面积大，火焰筒壁面局部高温热斑显著、壁面温度梯度大等特性。本文针对采用多斜孔冷却的斜流燃烧室，开展了全环试验件的壁温分布试验研究。获得了不同进口马赫数、进口温度以及油气比对火焰筒壁温分布的影响规律，为掌握壁温分布特性和冷却方案优化提供了有效参考。火焰筒壁面的高温区主要分布在凹腔前壁；进口温度较低且油气比较小时，过喷嘴截面的火焰筒壁温会高于喷嘴间截面，反之喷嘴间截面温度逐渐高于过喷嘴截面；火焰筒的平均壁温随着油气比和进口温度的增大而增大，而对进口马赫数的变化不敏感。此外，本文为流向上不连续的火焰筒壁面的冷却方案设计和改进提供了有效参考。对于不连续的火焰筒壁面，很难形成连续的气膜，仅采用多斜孔冷却结构无法满足冷却要求，需要考虑其他有效的冷却结构，或者多个冷却结构的组合。
ZHANG Jingyu, WANG Min, WANG Long, WANG Jiaxi, JIANG Ping, HE Xiaomin
. Experimental Investigation on Liner Cooling Characteristics of a Mixed-Flow Trapped Vortex Combustor[J]. 热科学学报, 2023
, 32(6)
: 2222
-2234
.
DOI: 10.1007/s11630-023-1840-9
The mixed-flow trapped vortex combustor (TVC) is a new type of combustor that applies trapped vortex flame stabilization technology to mixed-flow combustor. Compared with the traditional mixed-flow combustor, the mixed-flow TVC has many advantages, such as complicated structure of the vortex flow field inside liner, large cooling area, significant local hot spots on the liner, and large wall temperature gradient. In this paper, for a mixed-flow TVC with inclined multi-hole cooling, the liner wall temperature of an annular test rig was examined in experiments. The effects of inlet temperature (T3), inlet Mach number (Ma) and fuel to air ratio (FAR) on the temperature of liner wall were obtained, which provided a valuable reference for understanding the distribution characteristics of liner wall temperature. The experiment results show that the highest temperature is found to be on the fore-wall of the cavity. When T3 and FAR are low, the highest wall temperature was obtained in injector plane. However, the wall temperature in the center plane between two adjacent injectors was higher than that in injector plane under the condition of high FAR and T3. With the increase of FAR and T3, the average wall temperature increases. Ma has a slight impact on the average wall temperature. In addition, this paper provides an effective reference for the design and improvement of the liner cooling structure of the combustor with many discontinuous small-area walls in the flow direction. It is difficult to form a continuous film, and cooling requirements can’t be achieved only by using inclined multi-hole cooling structure. Consideration needs to be given to other efficient cooling structures, or to the combination of multiple cooling structures.
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