摘要
湿压缩技术是目前提高燃气轮机功率与效率、降低污染排放的一种经济有效的手段,其机制研究对改善压气机流场流动状况及充分利用该技术的潜在效能具有重要意义。基于CFD软件平台,选择k-ω湍流模型,利用安托万方程求蒸汽饱和压力,并结合五系数变比热公式求水蒸气比热、焓值与潜热值、熵值,对两级低压压气机进口喷雾湿压缩进行三维数值模拟研究。模拟结果表明,喷雾湿压缩降低了气流温度与比压缩功,提高了压比与流量;同时使得叶片吸力面高能流体区向尾缘方向移动,激发尾缘附近的低能流体层变薄,这有益于减小附面层损失,提高压气机通流能力与压缩效率。
Wet compression technology is currently an economical and effective means of not only boosting power output and efficiency but also reducing pollution emissions of gas turbines. Thus the research of wet compression mechanism is of great importance to improve the flow field condition in compressor and take full advantage of potential ability of the technology. Based on CFD software platform, a 3D numerical simulation of inlet spraying into a two-stage low-pressure compressor was carried out through adopting k-o9 turbulence model for turbulence, Antoine equation for vapor saturation pressure, and variable specific heat function with five coefficients for water vapor specific heat, enthalpy and entropy. The simulation results show that wet compression of inlet spraying can decrease gas mixture temperature and specific compression work, as well as elevate pressure ratio and mass flowrate. At the same time it causes a small migration of high momentum fluid on suction side to the trailing which induces a corresponding small attenuation of low momentum fluid layer about the trailing. And this phenomenon is beneficial to reducing the boundary layer loss and elevating the throughflow ability and compression efficiency of compressor.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第32期76-82,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50776021)~~
关键词
低压压气机
湿压缩
喷雾
变比热
数值模拟
low-pressure compressor
wet compression
spraying
variable specific heat
numerical simulation
