超临界压力下乳化煤油传热性能数值研究

Numerical study on heat transfer characteristics of emulsified kerosene at supercritical pressure

关键词:  超临界压力  乳化燃料  煤油  传热  数值计算

Key words:  Supercritical pressure  Emulsified fuel  Kerosene  Heat transfer  Numerical calculation

摘要:

为了减少煤油在冷却时的结焦析碳,研究乳化煤油在超临界压力工况下传热特性随热负荷变化的规律以及析碳的影响。在对比煤油工质的计算与试验数据的基础上,改进并验证了模型的可用性,得到各相、各参数的全场分布及壁温随热负荷变化规律;在相同工况和热负荷下,乳化油比煤油更能起到降低壁温、减少析碳的作用;含水量越大乳化煤油降低壁温效果越好,但不能进一步减少析碳量。

Abstract:

Heat transfer and thermal stability characteristics of supercritical emulsified kerosene were studied in order to reduce the deposition of carbon during the cooling of kerosene.Based on the comparison between calculated and experimental data of kerosene,the numerical model of heat transfer was improved and proved to be feasibile.Based on the above model,the profile contours of each phase and parameter were shown numerically,and the relations between the wall temperature and heat flux were obtained.The emulsified fuel is superior to kerosene in aspects of bringing down the wall temperature and reducing the deposition of carbon. The more water content there is in the emulsified kerosene,the lower wall temperature becomes.However,the increase of water content can not reduce the deposition of carbon further.