不同环境背压和环境温度下的液氨喷雾微观特性

Microscopic characteristics were studied for liquid ammonia spray experimentally to realize low-carbon and zero-carbon goals with liquid ammonia as fuel of internal combustion engine. The liquid ammonia spray at different ambient pressures (100, 200, 400, 600 kPa) and ambient temperatures (293, 313, 333 K) were experimentally investigated by using the Particle/Droplet Image Analysis (PDIA) method and using a single hole injector with the injection pressure of 1 MPa. Some microscopic parameters were obtained, such as the particle density function, cumulative distribution function, the Sault Mean Diameter (SMD), and the droplet number density. The results show that the liquid ammonia spray has a good atomization effect and have large amount of small particles under low ambient pressure; The particle density function and cumulative distribution function move to a larger droplet sizes, the number of larger droplets increase and the droplet density decrease; The particle density function, cumulative distribution function and SMD hardly changed with the ambient temperature, but the liquid ammonia spray evaporation is enhanced at high ambient temperature.