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本文提出了一个燃料液滴在高压环境下的蒸发理论,该理论考虑了液滴表面的内移、液滴不定常加热以及高压非理想气体效应的影响等因素。计算了C_(12)H_(26)液滴在1.8—90大气压、2000—3200°K的N_2气介质中蒸发时的滴温、半径随时间变化的关系。计算结果表明,存在一个划分亚临界蒸发和超临界蒸发的压力极限,在亚临界蒸发时,液滴生存时间随压力增加而减少,超临界蒸发时,液滴生存时间随压力增加而增加,在本例情况下,此极限压力值为2.23p_c。
In this paper, a theory of vaporization of fuel droplets under high pressure is proposed. The theory takes into account factors such as the internal migration of droplets, the unsteady droplet heating and the effect of non-ideal high-pressure gas. The relationship between the drop temperature and the radius of C 12 H 26 droplets during evaporation in N 2 gas medium of 1.8-90 atm and 2000-3200 ° K was calculated. The calculated results show that there is a pressure limit for subcritical and supercritical evaporation. When subcritical evaporation occurs, the droplet survival time decreases with increasing pressure. In supercritical evaporation, the droplet survival time increases with increasing pressure. In this case, the limit pressure is 2.23p_c.