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底排装置尾部化学非平衡流的数值模拟 被引量:3

Numerical Simulation of Base Flow with Chemical Non-Equilibrium for Base Bleed Equipment
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摘要 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1025K〈Tj≤1100K时,底排装置尾部发生二次燃烧,且随着Tj的增加,燃烧逐渐由不充分变为充分,二次燃烧使底排装置尾部的高温区域大幅增加,且底排减阻率由13.7%速增到57.5%。当Tj〉1100K时,二次燃烧充分。底排装置的排气温度应大于1100K。 In order to investigate the effects of the secondary combustion on the drag reduction rate of base bleed,a H2-CO combustion model which consists 8 components and 12 reactions was used for the secondary combustion simulations. Two-dimensional axisymmetric equations were programmatically computed using a set of uniform numerical process methods. The base flow with chemical non-equilibrium of base bleed was simulated. The base pressure of the base bleed equipment with different injection parameters of the simulations were basically in agreement with the experimental data. The results show that the base pressure of the base bleed equipment first increases rapidly with the increase of the injection parameters I. When the injection parameters I reaches 0.007,the growth of the base pressure gradually slows. When I=0.01-0.015,the base pressure is basically unchanged with the increase of the I,and the effect of drag reduction with base bleed is best. When the injection temperature Tj≤1025K,the drag reduction rate of base bleed is relatively small,because the secondary combustion has not happened in the base region of the base bleed equipment. When 1025K〈Tj≤1100K,the secondary combustion happens,and changes from incomplete to complete with the increase of the Tj. Secondary combustion greatly increases the high temperature region in the tail of the base bleed equipment,and makes the drag reduction rate of base bleed increase from 13.7%to 57.5%. When Tj〉1100K,the secondary combustion is complete. The injection temperature of the base bleed equipment should be larger than 1100K.
出处 《推进技术》 EI CAS CSCD 北大核心 2015年第11期1610-1615,共6页 Journal of Propulsion Technology
基金 国家自然科学基金项目(51176076)
关键词 流体力学 底部排气 二次燃烧 数值模拟 尾部流场 化学非平衡流 Fluid mechanics Base bleed Secondary combustion Numerical simulation Base flow field Chemical non-equilibrium flow
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参考文献19

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