Numerical Research on the Unsteady Evaporation of Spray Droplet at the High Pressure Ambient of Combustor

On the condition of considering the influence of droplet internal flow,high pressure gas-liquid equilibrium,gas solution and high pressure properties correcting,the unsteady evaporation characteristics at high pressure ambient,the varying relation between droplet lifetime and ambient condition and several high pressure non-ideal factors has been simulated and analyzed using transient high pressure evaporation model.The results show that the droplet would endure unstable heating all along,the amount of gas solution would increase gradually,the droplet swelling is much more noticeable at the beginning of evaporation,and the radius variation doesn't obey D2 law anymore along with the increase of ambient pressure.Increasing the ambient pressure is in favor of shortening droplet lifetime at high temperature ambient;however,it would prolong droplet lifetime at low temperature ambient.Ignoring the influence of gas solution would increase the droplet lifetime appreciably,but ignoring high pressure property correcting and droplet internal flow would decrease the droplet lifetime greatly.