Study of HAN-Based Liquid Propellant Droplet Evaporation in High-Temperature and High-Pressure Environments

Abstract

A high-temperature, high-pressure evaporation model for HAN-based liquid propellant droplet was built, which considered the multicomponent droplet, the unsteady heating-up, the droplet surface regression, and the nonideal gas effect. Based on the state equation of the real gas, a computation method applicable to high-pressure thermophysical property parameters was established. By use of the evaporation model, the evaporation process of a LP1845 droplet in the nitrogen atmosphere for pressures of 100–300 atm and temperatures of 1600 K was studied. The results indicate that the droplet radius increases firstly and reduces afterward as the evaporation goes on, and the reduction rate of the radius satisfies the D2 law. The droplet temperature rises rapidly at the beginning, then maintains stable gradually at an equilibrium value. When the ambient temperature remains constant, with increasing ambient pressure, the time to reach the equilibrium temperature lengthens, but the droplet lifetime shortens.