Development of Design Support System on Combustion Parameters for High-Efficiency and Low-Emission Diesel Engines

采用现象学仿真模型和三维体绘制技术，开发了高效低排放柴油机燃烧参数设计支持系统。研究了燃烧过程参数对液体雾化过程、柴油喷雾特性、燃烧特性和尾气排放的影响，并建立了本课题组独特的现象学模拟模型。此外，广岛大学还开发了三维体绘制技术，以便将意义和计算结果真实地可视化。本课题将气象学仿真模型与体绘制技术相结合，开发了柴油机设计支持系统。1995年，利用激光诱导荧光新技术研究了一直未解决的喷雾内液体雾化过程，并应用新技术对液体雾化模型进行了修正。1996年，采用2波长激光吸收散射法研究了燃烧室壁面上的喷雾和火焰行为。在此基础上，完成了计算结果的三维可视化系统和用户界面系统。使用奔腾计算机计算柴油燃烧时间为2 ~ 3分钟，数据转换时间为5 ~ 10分钟，三维可视化需要1分钟左右。使用硅-图形靛蓝。

Design support system on combustion parameters for high-efficiency and low-emission diesel engines has been developed using the phenomenological simulation model and 3-dimensional volume rendering technique.The effects of combustion process parameters on liquid atomization process, diesel spray characteristics, combustion characteristics and exhaust emissions has been reseached, and the unique phenomenological simulation model has been developed by our research group. Moreover, 3-dimensional volume rendering technique has been also developed at Hiroshima University in order to visualize meansred and calculated results realistically. In this research project, the phemonenological simulation model and the volume rendering technique has been combined for developing a design support system of diesel engines.In 1995, the liquid atomization process inner a spray which has been unresolved was researched using a new laser induced fluorescent technique, and the liquid atomization model was modified applying the results by the new technique.In 1996, spray and flame behavior impinging on a combustion chamber wall were investigated using the 2 wavelength laser absorption and scattering method. Furthermore, 3-dimensional visualization system of calculated results and a user interface system were completed. The calculating time of the diesel combustion is 2 or 3 minutes using a Pentium PC,the time for data converting is 5 or 10 minutes, and about one minute is requied for 3 dimensional visualization.using a Silicon-Graphics Indigo.