力学学报 ›› 2016, Vol. 48 ›› Issue (3): 566-575.doi: 10.6052/0459-1879-15-084

• 流体力学 • 上一篇    下一篇

圆环旋转黏性液体射流破碎液滴粒径与速度数量密度分布相关性研究

阎凯, 宁智, 吕明, 孙春华, 付娟, 李元绪   

  1. 北京交通大学机械与电子控制工程学院, 北京 100044
  • 收稿日期:2015-03-17 修回日期:2016-03-23 出版日期:2016-05-18 发布日期:2016-05-12
  • 通讯作者: 宁智,教授,主要研究方向:射流雾化以及微粒沉降等.E-mail:zhining@bjtu.edu.cn E-mail:zhining@bjtu.edu.cn
  • 基金资助:

    国家自然科学基金(5127600,北京市自然科学基金(3132016),中央高校基本科研业务费专项基金(2016JBM049)和国家高技术研究发展计划(2013AA065303)资助项目.

STUDY ON CORRELATION OF BREAKUP DROPLET SIZE AND VELOCITY DISTRIBUTIONS OF AN ANNULAR SWIRLING VISCOUS LIQUID SHEET

Yan Kai, Ning Zhi, Lü Ming, Sun Chunhua, Fu Juan, Li Yuanxu   

  1. College of Mechanical and Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
  • Received:2015-03-17 Revised:2016-03-23 Online:2016-05-18 Published:2016-05-12

摘要:

压力旋流喷嘴被广泛应用于航空发动机、船用发动机、车用汽油缸内直喷发动机、燃气轮机等动力机械的燃油喷射系统中.以压力旋流喷嘴射流为研究对象,开展了圆环旋转黏性液体射流破碎液滴粒径与速度数量密度分布相关性问题研究.对于液体射流,以往的研究往往对破碎液滴粒径数量密度分布或速度数量密度分布进行单独研究,对于这两种数量密度分布之间关系的研究较少;从相关性的角度对圆环旋转黏性液体射流破碎液滴粒径与速度数量密度分布之间的关系进行研究.采用最大熵原理方法建立了圆环旋转黏性液体射流破碎液滴粒径与速度联合概率密度函数.对圆环旋转黏性液体射流破碎液滴粒径与速度联合概率密度函数进行了讨论,对圆环旋转黏性液体射流破碎液滴粒径数量密度分布与速度数量密度分布的相关性问题进行了研究.研究结果表明,为了给出正确的圆环旋转黏性液体射流破碎液滴粒径与速度联合概率密度函数,射流守恒约束条件中必须同时包括质量守恒定律、动量守恒定律以及能量守恒定律;破碎液滴粒径的数量密度分布与速度数量密度分布密切相关;射流旋转强度对破碎液滴粒径数量密度与速度数量密度分布结构影响不大,对破碎液滴粒径数量密度和速度数量密度的分布区域影响较大.

关键词:

圆环旋转黏性液体射流|破碎液滴|液滴粒径与速度数量密度分布|最大熵原理

Abstract:

Pressure swirling atomizers are wildly used in the fuel injection systems of aero-engines, marine engines, vehicle gasoline direct injection engines and gas turbines, et al. Considering about a pressure swirling atomizer liquid jet, the correlation of breakup droplet size and velocity distributions of an annular swirling viscous liquid sheet is studied. Joint probability density function of droplet size and velocity distribution of an annular swirling viscous liquid sheet is reduced based on maximum entropy method. The correlation between droplet size distribution and droplet velocity distribution are then discussed. Results show that with the right form of joint probability density function, the conservation laws of mass, momentum and energy must be included together as the constraint conditions. Droplet size and velocity distributions are closely related. And the liquid sheet swirling strength does not affect the structure of joint probability density function a lot, but the liquid swirling strength affect the distribution region to some extent.

Key words:

an annular swirling viscous liquid sheet|breakup droplet|droplet size and velocity distributions|maximum entropy principle

中图分类号: 

  • U473