火焰筒多斜邻接孔冷却特性数值模拟分析OA

To enhance the cooling performance of the combustion chamber flame tube and optimize the cooling structure of multi-angled adjacent holes,numerical simulations were conducted using Fluent soft-ware under the conditions of coolant-to-mainstream temperature ratio of 0.43,mass flow rates of 85 m3/h and 580 m3/h for the coolant and mainstream respectively,while maintaining consistent porosity.The flame tube wall was simplified as a flat plate for simulation.The effects of different main-hole diame-ters(D)and the spanwise center-to-center spacing between main holes(Y1)on the cooling characteris-tics of the flame tube wall were investigated by analyzing and comparing the temperature distribution on the hot-side wall,the streamwise and spanwise distributions of overall cooling effectiveness(φ),the dis-charge coefficient(Cd),and the streamwise and spanwise surface heat transfer coefficient ratio(h/h0).The results show that smaller D and Y1 values can rapidly form a continuous and uniform low-tempera-ture zone on the hot-side wall.When D increases from 0.8 mm to 1.5 mm,the peak streamwise φ decrea-ses by 17.5％,and the spanwise average φ reduces by 14.5％.Compared to the model with D=0.8 mm,the Cd of models with D=1.4 mm and 1.5 mm increases by 122.2％and 188.8％,respectively.For smal-ler D and Y1,the hot-side wall is dominated by low-intensity shear vortices,with turbulent kinetic ener-gy concentrated in the near-wall region(Y＜3 mm),reaching a maximum value of approximately 95 m2/s2.Increasing D and Y1 intensifies the separation of the film shear layer,leading to the formation of larger-scale kidney-shaped vortices.For all models,the streamwise h/h0 ranges from 3.1 to 5.2 within the in-terval 0＜X＜20 mm,and stabilizes between 1.5 and 2.1 while in the region X=30～60 mm,indicating the effective isolation of hot gases by the film layer.In the spanwise edge region(Z=25～30 mm),the model with D=1.3 mm exhibits a peak h/h0 value of up to 2.4,which is approximately about 14.2％higher than the peak spanwise h/h0 of the model with D=0.8 mm.