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为研究幂律型本构关系对于凝胶推进剂雾化的影响,应用光滑粒子流体动力学(SPH)方法进行了凝胶推进剂的射流撞击雾化仿真,并与实验结果进行了对比。推导了幂律型本构关系的SPH求解方法,发展了三维隐式SPH算法,克服了凝胶推进剂的高粘度对于时间步长的限制。制备了胶凝剂含量分别为1%,2%的两种水基凝胶推进剂模拟液并进行了6种工况的雾化实验和数值模拟,证明了本文SPH方法可以有效模拟凝胶推进剂的雾化问题。对于本文研究的工况,雾化区内模拟液的表观粘度普遍高于10-2N?s/m2,从撞击点至雾化区下游,模拟液的表观粘度呈震荡上升分布。分析表明,雾化区下游的高表观粘度是造成凝胶推进剂雾化生成液丝及大尺寸液滴的重要原因。
In order to study the influence of the power-law constitutive relation on the atomization of gel propellants, jet-atomization atomization simulation of gel propellant was carried out by using the method of smooth particle hydrodynamics (SPH). The results were compared with the experimental results. The SPH method to solve the constitutive law of power law is deduced, and a three-dimensional implicit SPH algorithm is developed to overcome the limitation of high viscosity of gel propellant to time step. Two types of water-based gel propellant simulants with 1% and 2% gelling agent respectively were prepared and the atomization experiments and numerical simulations of 6 kinds of working conditions were carried out. It is proved that SPH method can simulate the effect of gel propulsion Agent atomization problem. The apparent viscosity of the simulated liquid in the atomization zone is generally higher than 10-2N? S / m2 for the working conditions studied in this article. The apparent viscosity of the simulated liquid fluctuates upwards from the impact point to the downstream of the atomization zone. The analysis shows that the high apparent viscosity downstream of the atomization zone is an important reason for the formation of liquid filaments and large size droplets by the atomization of gel propellants.