论文部分内容阅读
为了研究来流条件对固体燃料燃速以及自持燃烧性能的影响规律,采用3阶单调迎风格式(MUSCL)重构方法,AUSMPW+通量分裂格式,k-w剪切应力输运(SST)湍流模型,7组分3反应有限速率化学反应模型以及2阶矩湍流燃烧模型,编制了二维轴对称湍流燃烧仿真程序。仿真结果显示:来流质量流率和总温的增加会提高燃速,温度和质量通量的影响指数大约为0.95~1.00和0.67;来流条件影响燃速的主要机理是壁面附近温度和湍流黏性的变化,其中湍流黏性是主要影响因素;随着质量流率的增加,特征速度逐渐降低,当入口马赫数接近1时,特征速度大约为850m/s,固体燃料将无法自持燃烧。
In order to study the effect of flow conditions on combustion rate and self-sustaining combustion performance of solid fuel, a 3-order monotonic upwind reconstruction (MUSCL) method, AUSMPW + flux splitting format, kw shear stress transport (SST) turbulence model, Component 3 reaction rate-limited chemical reaction model and the second moment turbulent combustion model, a two-dimensional axisymmetric turbulent combustion simulation program was prepared. The simulation results show that the increase of mass flow rate and total temperature will increase the burning rate, and the influence indexes of temperature and mass flux are about 0.95-1.00 and 0.67. The main mechanism of the flow rate affecting the combustion rate is the temperature and turbulent flow near the wall Viscous changes, of which turbulent viscosity is the main influencing factor. With the mass flow rate increasing, the characteristic velocity decreases gradually. When the Mach number is close to 1, the characteristic velocity is about 850m / s, and the solid fuel can not self-sustain combustion.