超声速钝体逆向喷流减阻的数值模拟研究

• 作 者: 周超英 纪文英 张兴伟 邓立君
• 机 构: 哈尔滨工业大学深圳研究生院,
• 出 处: 应用力学学报
• 发表日期: 2012年02期
• 关键词: 喷流 超声速 逆向喷流 钝体 减阻 临界喷流总压 湍流模型 模态 球头 射流

为研究逆向喷流技术对超声速钝体减阻的影响,采用标准k-ε湍流模型,通过求解二维Navier-Stokes方程对超声速球头体逆向冷喷流流场进行了数值模拟,并着重分析了喷口总压、喷口尺寸对流场模态和减阻效果的影响。计算结果显示:随着喷流总压的变化,流场可出现两种流动模态,即长射流穿透模态和短射流穿透模态;喷流能使球头体受到的阻力明显减小;存在最大减阻临界喷流总压值(在所研究参数范围内最大减阻可达51.1%);在其它喷流物理参数不变时,随着喷口尺寸的增大,同一流动模态下的减阻效果下降。本文的研究对超声速钝体减阻技术在工程上的应用具有一定的参考价值。

In order to study the influence of reverse jet technology on drag reduction of supersonic bluff body, the numerical simulation of the reverse cold jet flow field of supersonic capillaries was carried out by solving the two-dimensional Navier-Stokes equations using a standard k-ε turbulence model The effects of nozzle total pressure, nozzle size on the flow field mode and drag reduction effect were investigated. The results show that with the change of total jet pressure, there are two kinds of flow modes in the flow field, namely the long jet penetration mode and the short jet penetration mode; the jet flow can significantly reduce the resistance of the ball body The maximum pressure drop of the maximum drag reduction jet exists (up to 51.1% maximum drag reduction in the range of the studied parameters); while the physical parameters of other jet flow are constant, with the increase of the nozzle size, the same flow mode Drag reduction effect under the decline. The research of this paper has a certain reference value for the application of ultrasonic bluff body drag reduction technology in engineering.