CAJ | 학술논문

为了考察固体火箭发动机内金属颗粒在生长过程中所产生的非球颗粒受力问题，采用数值模拟方法，在通过和文献及实验数据对比验证确定最佳计算模型的基础上，对初始半径为100μm 的铝颗粒处于不同相变燃烧阶段时所受到的曳力进行对比分析。结果表明，在多相流场中，非球颗粒表面可能存在两处压力为零的点，曳力系数普遍大于其当量直径颗粒的计算结果，当颗粒外形严重偏离球体时，经验公式计算所得的曳力系数有失精准，需进行相应修正。
위료고찰고체화전발동궤내금속과립재생장과정중소산생적비구과립수력문제，채용수치모의방법，재통과화문헌급실험수거대비험증학정최가계산모형적기출상，대초시반경위100μm 적려과립처우불동상변연소계단시소수도적예력진행대비분석。결과표명，재다상류장중，비구과립표면가능존재량처압력위령적점，예력계수보편대우기당량직경과립적계산결과，당과립외형엄중편리구체시，경험공식계산소득적예력계수유실정준，수진행상응수정。
To study the force acted on the non?spherical particle which is produced by burning metal particle in solid ramjet motor,numerical simulation was employed to compare and analyze the drag of aluminum particle whose initial radius is 100 μm in variable phases of the burning process. Before that,the best computational model was determined and validated by comparing with the reference and experimental data.The results show that,in multiphase flow there are two points where the pressure is zero at the non?spherical particle's surface.Compared to the equivalent diameter particle, the real particle's drag coefficient is generally bigger. If the particle is not close to the spherical any more, the drag coefficient computed by the empirical formula is of great roughness, and the formula should be consequentially amended.