Cavitation Investigation Database for Model Evaluations and Developments, Part 1

Cavitation inside fuel injection nozzles affects the atomization process of injected liquids. It is necessary to understand and model the process for realizing an appropriate injection strategy for an efficient combustion. As the nature of the fuel injector, it has contraction, divergent and bending parts from small to large scale. These geometrical characteristics of the nozzle have an effect on the cavitation phenomena even if it is kind of a small manufacturing variation. However, a simultaneous contained database for the transient cavitation structure especially inside the real-scale nozzle and the nozzle geometry has not been established well. Therefore, parametric investigations have been done on our manufactured transparent nozzles. And the results will be shared step by step for the cavitation model evaluations and developments. In this database, the results in below on each nozzle are uploaded. 1. High speed imaging of the transient cavitation structure. 2. Nozzle geometry which modified as close as the measured shape. 3. Samples of mesh files and simulation results (PDF). The purpose of this database is to provide the data to someone who intends to understand and model the cavitation phenomena. This research work is financially supported by German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the project DI 591/29-1. First of all, please read "About_this_database.pdf".燃油喷射喷嘴内部的空化现象会对喷射液体的雾化过程产生显著影响。为制定实现高效燃烧的合理喷射策略，理解并建模该空化过程具有重要意义。受燃油喷嘴的固有结构特性制约，其普遍包含从小尺度到大尺度分布的收缩段、扩张段与弯曲流道。即便仅存在微小的制造偏差，喷嘴的此类几何特征也会对空化现象产生显著影响。然而，目前尚未建立起兼顾真实尺度喷嘴内部瞬态空化结构与对应喷嘴几何参数的完备配套数据库。为此，我们针对自主加工的透明喷嘴开展了参数化研究，并将逐步公开相关研究成果，以供空化模型的评估与开发工作使用。本数据库上传了各受试喷嘴的以下三类数据：1. 瞬态空化结构的高速成像结果；2. 尽可能贴合实测几何形状修正后的喷嘴模型；3. 网格文件样本与仿真结果（PDF格式）。本数据库的建设目标是为意图理解并建模空化现象的科研人员提供公开数据支持。本研究工作由德国研究基金会（Deutsche Forschungsgemeinschaft, DFG）在项目DI 591/29-1框架下提供经费资助。请首先阅读文件"About_this_database.pdf"。