摘要
喷管是风洞实现高速均匀稳定气流的核心部件,变质量喷管可通过扩散段管壁的缝隙流出部分气流来实现在不同背压下得到不同的出口马赫数。基于空气动力学原理,采用三维N-S方程以及可实现k-ε湍流模型,对喷管内流场进行了数值模拟。结果表明:收缩段型线、扩散段长度及壁缝尺寸对喷管流场特性具有重要影响,合理的型线和几何尺寸可使喷管出口具有宽阔的马赫数范围、且流场均匀稳定。
Nozzle is the core components of high-speed wind tunnel with uniform and stable airflow,slotted nozzle can get different Mach number in variable back pressure via self-adaptive mass rate of slots from divergent section. Based on aerodynamics theory,a novel transonic slotted nozzle of variable mass was designed. The flow fields of the transonic slotted nozzle were numerically simulated,by solving 3-D N-S equations and the realizable k-ε turbulence model. The numerical results show that contraction curve、divergent section length and slot size can affect flow field of the nozzle seriously. Nozzle exit has characteristics of wide flow rate range、uniform and stable airflow with suitable contraction curve and geometry.
出处
《科学技术与工程》
2010年第16期4075-4079,共5页
Science Technology and Engineering
基金
国家自然科学基金重点项目(50336050)资助
关键词
跨音速
缝式喷管
设计
数值模拟
transonic slotted nozzle design numerical simulation
