应急发射下发射阀气介质流道结构优化研究

发布时间：2018-04-12 15:07

本文选题：发射阀 + 应急发射　；参考：《中国舰船研究院》2016年硕士论文

【摘要】：空气涡轮泵发射系统作为一种流体动力机械,作用特殊,它的内部流体的流动情况直接或间接的影响了空气涡轮泵发射系统工作中所表现出的所有瞬态特性,而发射阀则是空气涡轮泵发射系统的关键部件,影响空气涡轮泵发射系统瞬态特性从而实现对发射过程内弹道参数的控制。准确认识与把握详细的发射阀内部流场流动特征,对研究空气涡轮泵发射系统的瞬态特性具有重要意义。本文以发射阀为研究对象,采用数学建模及求解、数值模拟的方法,在应急发射下分别对发射阀阀芯改进前后的三种结构,进行发射阀气介质流道内流场数值计算研究。通过优化设计,得到发射阀气介质流道最优结构,研制发射阀气介质结构优化组件样机,开展发射阀气介质流道结构优化仿真与试验对比研究。具体研究内容如下:1.建立应急发射下涡轮泵发射系统的数学模型,并分别将改进前后的阀芯结构模型代入求解,对比分析不同阀芯结构对应急发射下涡轮泵发射系统的影响。通过建立发射阀的数学模型,既而建立空气涡轮泵发射系统的组成部件的数学模型,从而仿真计算整个发射系统发射过程,并且分析仿真结果。同时根据三种阀芯结构的具体形式,改变发射阀模型,进而对比仿真计算,研究发射阀结构的改变对发射系统内弹道的影响。2.建立发射阀气介质流道三维模型,对发射阀内流场使用CFD商用软件进行数值模拟,并改变发射阀三维模型,对比仿真不同阀芯结构内流场流动情况。利用前处理软件ICEM CFD进行结构化网格划分,基于剪切压力传输(SST)k-ω湍流模型,设立压力边界条件,对发射阀内流场的流动状态进行非定常条件下粘性可压的全三维数值研究。给出了发射阀阀芯动态运动过程中瞬态特性分布情况,同时对各个时刻的流场特点进行了分析;对比分析了改进前后的发射阀阀芯在运动状态下的压力、速度和速度矢量分布规律,仿真结果表明优化后的发射阀性能得到提升。3.研制气介质结构优化组件,将优化后的发射阀气介质流道结构组件替换集成进现有的发射阀内,进行仿真计算和试验结果的对比研究。在应急发射工况下,验证发射阀气介质流道结构优化设计结果的合理性和设计方法的科学性。
[Abstract]:Air turbine pump launch system as a kind of fluid power machinery, special function, its internal fluid flow directly or indirectly affects all transient characteristics exhibited by the system of air turbine pump emission, and emission valve is a key component of air turbine pump launch system, the effect of air turbine pump transient emission the system so as to control the emission of ballistic parameters in the procedure. To accurately understand and grasp the inner flow field of launching valve flow characteristics in detail, has important significance for the research on the transient characteristics of air turbine pump launch system. The emission valve as the research object, using mathematical modeling and solving method, numerical simulation, emission are studied respectively in the emergency emission valve before and after the improvement of three kinds of structure, numerical flow medium flow valve gas emission calculation research. Through optimization design, get fired gas valve The optimal channel structure, develop and launch valve gas medium structure optimization component prototype, carry out emission valve medium flow channel structure optimization simulation and experiment. The specific contents are as follows: 1. to establish a mathematical model of emergency emission pump launch system of the turbine, and respectively into core structure model and improved solution, comparative analysis of effects of different valve structure to launch emergency turbopump launch system. Through the establishment of mathematical model of launching valve, mathematical model and set of components of air turbine pump launch system, and launch the whole process of launching simulation system, and analyze the simulation results. At the same time according to the specific form of three kinds of valve structure, change valve emission model and calculation the comparison of simulation research, launching valve structure change of the transmitting system in ballistic impact.2. emission valve medium flow passage three-dimensional model of Flow field inside the valve using CFD software for numerical simulation, and the change of emission valve 3D model, simulation flow of different spool structure flow. By the pre processing software ICEM CFD structured grids, shear stress transport (SST) based on the k- turbulence model, the establishment of pressure boundary condition, non numerical study often under pressure of viscous flow state emission valve flow field. The distribution of transient emission characteristics of valve dynamic process are given, and the characteristics of the flow field at all times were analyzed; comparative analysis of the emission valve before and after the improvement in the state of motion under the pressure, velocity and velocity vector distribution the simulation results show that the emission valve, the performance of the optimized improved.3. medium structure optimization development of gas components, will launch valve medium flow passage structure component after optimization integrated replacement The simulation calculation and experimental results are compared in the existing launch valve. Under the emergency launching condition, the rationality of the optimization design result and the scientificity of the design method are verified.

【学位授予单位】：中国舰船研究院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U674.703.5

【相似文献】