Investigation of multiphase flow and cavitation processes in transparent injection nozzles under highest pressure condition

最高压力条件下透明喷嘴中的多相流和空化过程研究

• 批准号: 290019181
• 负责人: Professor Dr. Friedrich Dinkelacker
• 金额: --
• 依托单位: Institut für Technische Verbrennung (ITV)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/290019181?language=en
• 关键词: Investigation; multiphase; flow; cavitation; processes

For the mobility-based society the internal combustion engine will continue to be of major importance, particularly with regard to medium and long distance traffic as well as commercially used vehicles. In this context the technical knowledge about the fuel injection is of significant relevance, since the initial conditions for the subsequent combustion and pollutant formation are determined here. This is especially true with the focus on the potential savings of CO2, fuel economy and declining emission limits. This research project involves the development and application of methods, which also include the investigation of transient and dynamic flow processes inside the injector and in close proximity to the nozzle. This is not only technologically but also scientifically extremely challenging, as it includes dimensions of modern injectors in the sub-millimeter range (spray hole diameter 100-200 microns), the injection pressure of diesel injectors from with 2000 bar and more, multi-phase processes, for example, with cavitation in the needle seat and the injection port of the nozzle and highly transient effects, whose influence becomes increasingly dominant in terms of multi injections.In recent years great progress could be achieved by means of high temporal and spatial resolution measurement techniques at the ITV-Hanover. This research project is proposed to experimentally examine the processes in diesel injectors in order to collect and provide reliable measurement data for numerical modelling. The project consists of 3/4 experimental and 1/4 numerical work, because experience has shown that a close connection between experimental work and calculation methods is necessary. Furthermore, selected nozzles are provided for other research institutions for a collaborative survey within the framework of the international "Engine Combustion Network" (ECN) initiative. Also the achieved measurement results will be published so that other working groups can use them for the purpose of model development and validation.The following questions and objectives are pursued:1. Improved production of transparent injectors being close to realistic geometries. The strength of the transparent acrylic glass nozzles must be enhanced in real geometries for the investigation of very high injection pressures above 800 bar with defined boundary conditions.2. Experimental investigations of influence factors on transparent injector nozzles with defined and adjustable nozzle needle. Measurement for physical modelling of two-phase processes, especially with regard to the cavitation processes.3. Selected nozzle geometries with measured data for the CFD model development shall be provided, for example within the ECN network.4. Modelling of transient flow processes in injectors with CFD and verification of current CFD models of multiphase flow and cavitation in the high pressure range.

对于以移动为基础的社会，内燃机将继续发挥重要作用，特别是在中长途交通以及商用车辆方面。在这种情况下，关于燃油喷射的技术知识是非常重要的，因为随后的燃烧和污染物形成的初始条件在这里确定。这一点在关注潜在的二氧化碳减排、燃油经济性和降低排放限制方面尤其正确。该研究项目涉及方法的开发和应用，其中还包括对喷射器内部和靠近喷嘴的瞬态和动态流动过程的研究。这不仅在技术上，而且在科学上都极具挑战性，因为它包括亚毫米范围内的现代喷油器尺寸（喷孔直径100-200微米），柴油喷油器的喷射压力从2000 bar或更高，多相过程，例如，针座和喷嘴喷射口的空化以及高度瞬态效应，其影响在多次喷射方面越来越占主导地位。近年来，利用高时间和空间分辨率的测量技术在汉诺威国际航空航天展览会上取得了很大的进展。本课题旨在对柴油机喷油器内的过程进行实验研究，为数值模拟提供可靠的测量数据。该项目由3/4的实验工作和1/4的数值工作组成，因为经验表明，实验工作与计算方法之间的密切联系是必要的。此外，在国际“发动机燃烧网络”（ECN）倡议的框架内，选定的喷嘴提供给其他研究机构进行合作调查。同时，获得的测量结果将被发布，以便其他工作组可以将它们用于模型开发和验证。寻求下列问题和目标：改进了透明注入器的生产，接近真实的几何形状。透明丙烯酸玻璃喷嘴的强度必须在实际几何形状中得到增强，以便研究具有定义边界条件的800 bar以上的非常高的注射压力。喷嘴针可调透明喷嘴影响因素的实验研究。两相过程物理模型的测量，特别是关于空化过程的测量。应提供用于CFD模型开发的喷嘴几何形状和测量数据，例如在ECN网络中。用CFD对喷射器内瞬态流动过程进行建模，并对高压范围内多相流动和空化的现有CFD模型进行验证。

项目成果

Approaches for Detailed Investigations on Transient Flow and Spray Characteristics during High Pressure Fuel Injection

• DOI: 10.3390/app10124410
• 发表时间: 2020-06
• 期刊: Applied Sciences
• 作者: Noritsune Kawaharada;Lennart Thimm;Toni Dageförde;K. Gröger;H. Hansen;F. Dinkelacker

Continuous development of injection systems for HFO Engines from MAN Energy Solutions SE for future applications

MAN Energy Solutions SE 持续开发 HFO 发动机喷射系统，以适应未来应用

• DOI: 10.1007/978-3-658-23181-1_8
• 发表时间: 2018
• 期刊: Proceedings
• 作者: J. Wloka;A. Weber;T. Klaua;M. Indrich;S. Kern;L. Thimm;F. Dinkelacker
• 通讯作者: F. Dinkelacker