电站锅炉过热器和再热器T型三通对集箱静压分布影响的试验研究

为了获得过热器和再热器T型三通对集箱静压分布及三通两侧分流比对涡流区和集箱静压分布的影响规律,以空气为工质对纯三通模型进行流动特性试验.研究结果表明:带三通集箱静压分布受一次涡流和二次涡流的共同影响,一次涡流影响范围为-2.5D~2.5D(D为等径三通内径),二次涡流影响范围为-1.5D~1.5D;三通两侧分流比对涡流区范围影响较小;随着三通某侧流量增大,该侧静压降低,但静压分布规律无明显变化.在一次涡流影响范围内,正母线和右下40°线的静压差异受分流比的变化影响较小;侧母线的静压差异随分流比的增大而有所增大.

Experimental study on the static pressure distribution in the header with T-joint of boiler superheater and reheater

Experimental study on the flow characteristics of T-joint model using air as working fluid were conducted to get the influence of T-joint on the static pressure distribution in the header of boiler superheater and reheater as well as the influence of split ratio on the both sides of T-joint on the vortex zone and static pressure distribution. The results showed that the static pressure distribution in T-joint was affected by the first vortex and second vortex. The range affected by the first vortex was from -2.5 to 2.5 times inner diameter of T-joint. The range affected by the second vortex was from -1.5 to 1.5 times inner diameter of T-joint. The split ratio on both sides of T-joint had little effect on the range of vortex. As the flow rate increased on one side of T-joint,the static pressure on this side decreased. However,there was no significant changes of static pressure distribution. In the range affected by the first vortex,the split ratio had little impact on the static pressure difference at the position of positive generatrix and at lower right line of 40 degrees,while the static pressure difference at the position of side generatrix increased with the rising of split ratio.