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为了研究二次燃烧对底排增压减阻的影响,采用8组分12步反应的H2-CO燃烧模型作为二次燃烧模型,运用统一算法的思路编程求解二维轴对称多组分N-S方程,对底排装置尾部化学非平衡流进行数值模拟。底排装置的底压随排气参数变化的模拟结果和现有实验数据比较吻合。数值模拟结果表明:底排装置底部压力随着排气参数I的增加先迅速增大,当I达到0.007时,底压增长速度逐渐变慢,在I=0.01~0.015的范围内底压基本不变,此时底排增压减阻的效果最好。当排气温度Tj≤1025K时,底排装置尾部没有发生二次燃烧,底排减阻率相对较小。当1025K1100K时,二次燃烧充分。底排装置的排气温度应大于1100K。
In order to study the effect of secondary combustion on the drag reduction of bottom row, H2-CO combustion model of 8-component 12-step reaction was used as the secondary combustion model. The two-dimensional axisymmetric multi-component NS equation , The tail of the bottom row of chemical non-equilibrium flow numerical simulation. Bottom line device with the exhaust pressure changes in the bottom of the simulation results and existing experimental data more consistent. The numerical simulation results show that the pressure at the bottom of the bottom row device increases rapidly with the increase of the exhaust parameter I. When I reaches 0.007, the bottom pressure grows slowly, and the bottom pressure is basically not in the range of I = 0.01 ~ 0.015 Change, this time bottom row pressure reduction effect of the best. When the exhaust temperature Tj ≤ 1025K, the rear of the bottom row device did not occur secondary combustion, the bottom drag reduction rate is relatively small. When 1025K 1100K, the second combustion is sufficient. Bottom row device exhaust temperature should be greater than 1100K.