• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报

• 可再生能源与工程热物理 • 上一篇    下一篇

燃烧室结构对天然气转子发动机燃烧过程的影响

范宝伟1,  潘剑锋1,  黄俊2,  肖曼1,  姚嘉琪1   

  1. 1. 江苏大学能源与动力工程学院  镇江  212013;
    2. 中国第一汽车股份有限公司无锡油泵油嘴研究所  无锡  214063
  • 收稿日期:2014-11-26 修回日期:2015-05-21 出版日期:2015-11-15 发布日期:2015-11-15
  • 通讯作者: 潘剑锋,男,1978年出生,博士,教授,博士研究生导师。主要研究方向为微尺度燃烧和发动机燃烧过程。 E-mail:mike@ujs.edu.cn
  • 作者简介:范宝伟,男,1987年出生,博士研究生。主要研究方向为发动机燃烧过程。 E-mail:tsww1919@163.com
  • 基金资助:
    国家自然科学基金(51376082)、江苏省六大人才高峰第八批(装备制造201127)、江苏省高校优势学科建设工程和江苏省普通高校研究生科研创新计划(CXZZ13-0671)资助项目

Influence of Combustion Chamber Configuration on Combustion Process of Natural Gas-fueled Rotary Engines

FAN Baowei1,  PAN Jianfeng1,  HUANG Jun2,  XIAO Man1,  YAO Jiaqi1   

  1. 1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013;
    2. Wuxi Fuel Injection Equipment Research Institute, FAW, Wuxi 214063
  • Received:2014-11-26 Revised:2015-05-21 Online:2015-11-15 Published:2015-11-15

摘要: 以一台由端面进气汽油转子发动机改装而来的预混天然气转子发动机为研究对象,在FLUENT软件的基础上通过编程实现转子发动机三维网格的偏心运动,并选择合适的湍流模型、燃烧模型以及详细的CHEMKIN化学反应机理,建立基于化学反应动力学的端面进气天然气转子发动机三维动态数值模拟模型。通过与试验数据进行对比和分析,验证模型的可靠性。在此基础上,研究燃烧室结构对端面进气天然气转子发动机的缸内流场、温度场和中间产物浓度场的影响。结果表明,当燃烧室凹坑布置于转子曲面长度方向的前端和转子曲面宽度方向的中心时,燃烧过程同时利用了燃烧室后部的滚流以及燃烧室中部高速流区对火焰的加速作用,缸内整体燃烧速率最大。同时,其缸内压力最大以及中间产物OH的生成量也最大,其压力峰值比中置凹坑燃烧室提高了19.9%,但其NO质量分数仍在0.5%以内。

关键词: 端面进气转子发动机, 流场, 燃烧过程, 燃烧室结构, 三维动态模拟, 天然气

Abstract: Taking a side ported pre-mixed natural gas-fueled rotary engine converted from a gasoline rotary engine as the study object. On the basis of the Fluent simulation software, a three-dimensional dynamic simulation model is established by writing dynamic mesh programs and choosing the reasonable turbulent model, combustion model, CHEMKIN mechanism. The three-dimensional dynamic simulation model based on the chemical reaction kinetics is also validated by the experimental data. On this basis, the three-dimensional dynamic characteristics for flow, temperature field and the combustion intermediate product under different combustion chamber configuration are analyzed. The results show that when the rotor pocket is located at the front end of rotor surface along length direction and the center of the rotor surface along width direction, a tumble in the rear of combustion chamber and a high speed flow in the middle of combustion chamber are made full use to increase flame speed. The flame propagation speed reaches the maximum value. The indicator diagram is best and the production of OH is biggest. Comparing with mid pocket combustion chamber, the front pocket combustion chamber shows a 19.9 percent increase in the peak pressures, but NO emission mass fraction still stay within 0.5 percent.

Key words: combustion chamber configuration, combustion process, flow field, natural gas, side ported rotary engine, three-dimensional dynamic simulation