The Computational And Test Of The Flow Field For New Type Hydraulic-gap Buffer Based On CFD

As a kind of safety equipment, buffer has been used widely in such project fields as the traffic, electrical power system, building and machinery, etc. The safety of operating machine and machine lifetime are influenced directly by its performance. Nowadays, machines with larger scale and higher working speed become the development tendency, which require higher control accuracy under the circumstances of vibration and shock. So the excellent performance and high reliability of the buffer have become the focus and the difficulty in current research.Compared with other existing products, the new-style hydraulic-gap buffer has adopted new damping structure, which uses compressed nitrogen as reset. This innovation eliminates the fatigue of the metal spring and achieves no wear to work. At the same time the method, which takes advantage of the properties of no fatigue and low bulk modulus of nitrogen, makes the capacity and power-absorption ability prior, the rebound time short and the cushion force increased sharply and so on. The expected performance of buffer with damping structure made this research be valuable.In this paper, the new type hydraulic-gap buffer is the object of the research. Based on the theory of fluid mechanics and Computational Fluid Dynamic, the flow field of the new type hydraulic-gap buffer was studied with CFD software FLUENT. Dynamic mesh technology together with standard k-ε turbulence model and the SIMPLEC algorithm was utilized in the research. Based on constructed dynamic mesh model of the new type buffer, the flow characteristic of the key parts of the new type buffer was analyzed by velocity flow distribution as well as the cushion curve. Furthermore, the effect of cushioning gap, throttling shape and impact velocity on cushioning characteristics of the new type hydraulic-gap buffer was studied respectively, which will provide the reference for the parameter determining and structure optimizing of the inner channel in the new type hydraulic-gap buffer. The validation of simulation results was verified with experiment,which shows that the CFD method is suitable for analyzing the new type hydraulic-gap buffer. Meanwhile, this paper also provides a new method for product design and research which has preferable application value.