喷水对火箭发动机羽流红外特性的抑制作用研究

Research on Infrared Radiation Suppression of Rocket Motor Exhaust Plume with Water Injection

为研究喷水对火箭发动机发射时排气羽流红外辐射的抑制作用,建立了羽流气液两相流场和红外辐射传输的计算模型,通过在能量方程中引入辐射源项和水的汽化导致的能量源项,实现了辐射计算和两相流场计算的耦合求解.计算中采用M ixture多相流模型求解气液两相流流场,使用汽化模型模拟了水的汽化效应.使用离散坐标法求解辐射传输方程,得到了3个主要波段内羽流的红外强度分布,将计算结果与红外热图进行对比,验证了计算结果的可靠性.研究结果表明,喷水后辐射强度在喷水管之后的大范围区域内明显降低.

To study the infrared radiation suppressant of rocket motor exhaust plume with water injection, the calculation model for infrared radiation transfer of rocket motor and the muhiphase flow field of exhaust plume was built. The radiation source item and mass transfer item generated by water vaporization were induced to energy equation, thus the multiphase plume flow field and radiation transfer could be calculated in couples. The vaporization mechanism was researched and the Mixture muhiphase method was used to calculate the muhiphase flow field. The discrete ordinates method was used to solve the plume flow field of multi-species and the radiation transfer equation. Infrared radiation intensity contours of three principal spectral bands were obtained and the results accorded well with the infrared thermal images. It is concluded that the infrared radiation after the injection pipe decreases obviously because of the water injection.