mass additions meaning in English

成批增加

In the theoretical aspect , performance analytical model of was proposed , in which allowances were made to allow for variable cross - sectional area , include the heat release of chemical reaction , and allow for mass addition . software was generated , and performance of rocket ejector was analyzed accounting for heat release location , flow parameters and structural configuration
在理论方面，建立了引射火箭模态的性能分析模型，该模型考虑了化学反应放热、加质和变几何截面的影响；编写了相应的软件，并结合放热位置、流动参数和发动机结构进行了引射火箭的概念设计。