闭式循环柴油机排出气体喷淋冷却传热模型及实验关联研究

Research on exhaust gas and liquid heat-transfer models of the spraying cooler of closed cycle diesel and its experimental correlation

闭式循环柴油机(CCD)排出气体处理技术是各种不依赖空气动力装置(AIP)的共性技术,优选喷淋冷却方式并对其内部的气液传热模型化是该技术的核心。为此,分析对比了横流式、并流式、逆流式等喷淋冷却方式,对实际选用的CCDAIP横流式喷淋冷却器进行了气液传热分析。从单个液滴传热模型出发,采用分层计算方法建立了喷淋冷却传热计算模型,并应用Matlab语言编程计算各种工况下冷却效果。喷淋冷却实验结果与模型计算结果对比表明,该模型能够较精确地预测CCD排出气体喷淋冷却效果。

The way of disposing exhaust gas in closed cycle diesel (CCD) is an important common technique for all kinds of air-independent propulsion (AIP), but optimizing the way of cooling and modeling the gas-liquid heat-transfer in the cooler are the key technique. Some projects such as crosscurrent pattern and parallel pattern and coun-tercurrent pattern are analyzed and contrasted . Then, theorical model about the spraying cooler of experimental CCD AIP is analyzed. It is the first step that heat-transfer of single liquid drop is considered, and based on that mathematical models are set up using the method of delamination counter. The Matlab programme is applied to counter the cooling effect in different conditions. The heat-transfer models are inspected by contrasting the experimental results with the data from model-calculating and it is concluded that the established models can be predict the cooling effect of exhaust gas in CCD precisely.