Active control of the charge motion by fluidic vortex generators

通过流体涡流发生器主动控制电荷运动

• 批准号: 511725940
• 负责人: Professor Dr.-Ing. Peter Eilts
• 金额: --
• 依托单位: Institut für Strömungsmechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/511725940?language=en
• 关键词: Active; control; charge; motion; fluidic

Modern internal combustion engines utilize a designed motion of the cylinder charge to support mixture formation and/or combustion. For the generation of charge motion appropriately shaped intake ports are used. Generally an increase in charge motion causes a reduced flow capacity and thus an increased charge exchange work. In this project an alternative method of swirl generation will be investigated. As a basis a port is used which creates little charge motion. This will be increased by tangential pulsed injection of air into the port close to the valve seat. This makes it possible to vary the swirl continuously, different from switching ports on and off as usual. Further the preliminary work shows that the work needed to produce the compressed air is less than the increase of charge exchange work that would result from using a swirl port. The project will be carried out at the Institute of Fluid Mechanics (ISM) and the Institute of Internal Combustion Engines (ivb) at TU Braunschweig. Initially a series of ports will be designed, based on the preliminary work. These will be investigated by ISM with stationary RANS-simulations. The result is a pareto front of swirl vs. flow capacity. From this pareto front three ports with different swirl level will be chosen. They will be investigated experimentally on the flow test bench of ivb, in order to verify the simulation results. Further tests with air injection will be carried out using the ports with low and medium swirl. For unsteady investigations a test bed with a motored engine will be built up. The cylinder head will be designed such, that the inlet ports can be exchanged easily. The flow measurements will be carried out with hot wire anemometers, because with this technique the results are available much faster than with optical methods. This is important because of the large parameter space due to the variabilities of the air injection. The ISM will build up a simulation chain of uRANS- and IDDES-simulations for the unsteady investigations. OpenFOAM will be used as the simulation software. Using these tools a systematic optimisation will be carried out. The target is a parameter constellation, which gives a preferably high increase in swirl with a preferably low work for the production of compressed air. Then a port can be used which produces low swirl without air injection and has thus a high flow capacity. Finally engine simulations will be carried out for evalution. With a jointly adjusted approach involving experimental parameter studies and detailed recalculations with scale resolving simulations the effect of air injection on the development of swirl and the connected sensitivities can be explained and described.

现代内燃机利用气缸充气的设计运动来支持混合物形成和/或燃烧。为了产生充气运动，使用适当形状的进气口。通常，电荷运动的增加导致流动能力降低，从而导致电荷交换功增加。在这个项目中，将研究一种替代的涡流产生方法。作为基础，使用产生很少电荷运动的端口。这将通过切向脉冲喷射空气到靠近阀座的端口中来增加。这使得可以连续地改变涡流，不同于像往常一样打开和关闭端口。此外，初步工作表明，产生压缩空气所需的功小于使用旋流口所增加的充气交换功。该项目将在布伦瑞克理工大学的流体力学研究所（ISM）和内燃机研究所（ivb）进行。最初将在前期工作的基础上设计一系列港口。这些将通过ISM与稳态RANS模拟进行研究。结果是涡流与流量的帕累托前沿。从这个帕累托前沿，将选择三个具有不同涡流水平的气道。为了验证模拟结果，将在IVB流动试验台上进行实验研究。进一步的空气喷射试验将使用具有低和中等涡流的进气道进行。为了进行非定常研究，将建立一个装有发动机的试验台。气缸盖的设计应使进气口易于更换。将使用热线风速计进行流量测量，因为使用这种技术可以比光学方法更快地获得结果。这是重要的，因为由于空气喷射的可变性而导致的大的参数空间。ISM将为非定常研究建立uRANS和IDDES模拟链。OpenFOAM将被用作仿真软件。使用这些工具将进行系统的优化。目标是参数星座，其给出用于产生压缩空气的优选高的涡流增加和优选低的功。然后，可以使用在没有空气喷射的情况下产生低涡流的端口，并且因此具有高流动能力。最后进行了发动机模拟计算。通过涉及实验参数研究和详细重新计算的联合调整方法，可以解释和描述空气喷射对涡流发展和相关敏感性的影响。