The Flow Field Numerical Simulation Study Of Multy Stage Throttle Orifice In The Nuclear Pipe

Nowadays multistage orifice energy dissipation devices are widely used such as water conservancy system, the plane pressure oil pipeline system and cooling circulatory system etc. because they are cheap, easy to install and maintain. The multistage orifice energy dissipation device uses orifice throttling effect to dissipate energy. In this paper, the multistage orifice energy dissipation structure design for nuclear pipelines is researched.At present, the design of the multistage orifice energy dissipation devices does not have formed industry standardization, and there are a lot of empirical and randomness designs, once the design parameters are not accurate, it is easy to produce cavitation, vibration and noise, which will damage to the pipelines. So it is necessary to conduct the thorough research on the multistage orifice energy dissipation device. In this paper, the effect factors will be found through the theoretical analysis and numerical simulation about the energy dissipation device, which will lay the theory foundation for its design and optimization.In this paper, a certain multistage orifice energy dissipation device is studied as the following researches:First of all, a multistage orifice energy dissipation device model is established,by using Fluent software, the impact on pressure drop and the total pressure drop at all levels with different apertures will be obtain.Then, the effect on pressure drop, the total pressure drop and flow field with different orifice plate thickness, orifice diameters, and orifice chamfers in the orifice front-end and back-end will be gotten.Finally, the test experiment is set up. In order to prove the accuracy of the above analysis, the numerical simulation will be compared with experiment.