Microscopic characteristics of liquid ammonia spray at different ambient pressures and ambient temperatures
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.
internal combustion engineszero-carbon and low-carbon emissionsliquid ammonia spraymicroscopic characteristicsdroplet size distributiondroplet number density
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