蒸发器自然循环推动力计算模型研究

Calculating Model of Driving Power of Natural Cycle of Evaporators

在诸多影响因素中,抓住动力温度Δt0作为计算模型的主要理论基础,在分析沸腾室内汽化蒸发过程的不平衡影响后,提出包含不平衡过程的汽化温度影响系数K1和开始汽化深度影响系数K2的修正模型。经过沸腾室出口速度动能的试验测量和计算分析表明,出口动能消耗对推动力值有明显的影响,其幅度达到10%左右,对此提出便于循环流路计算的有效推动力概念及相应计算模型,推出采用综合影响系数K处理模式的工程计算式。

As the essential theoretical basis of the calculating model, the temperature difference (power) is grasped from so many factors whose interrelationship is complex. After the effect of disequilibrium evaporation process in evaporating chamber is analyzed thoroughly, the correction model is proposed which involves the effect coefficient K_1 of evaporating temperature of disequilibrium process and another effect coefficient K_2 of evaporating depth where vaporization begins. By calculation analysis of the flowing velocity and kinetic energy at the outlet of evaporating chamber, it is indicated that there is great effect of kinetic energy consumption on the driving force value. For this, the concept of effective driving force and the corresponding calculation model are proposed, which are convenient for the calculation of cycle flow path. The engineering calculating formula with the comprehensive effect coefficient K is produced in order to consider the effect factors such as unlinear process in all-round way.