前混合磨料射流清洗噴嘴內(nèi)外流場(chǎng)的仿真研究
[Abstract]:Pre-mixed abrasive jet cleaning technology is a rising technology in 1980's. The working process is as follows: firstly, the abrasive slurry is mixed and accelerated in a steel wire braided hose with a certain length of high pressure resistance by mixing the abrasive and water in advance through the abrasive tank, and then a high-speed jet is formed through the nozzle. The jet reaches the target to be cleaned, and finally achieves the purpose of cleaning. In this process, the jet has higher energy due to the abrasive acceleration, which is why the pre-mixed abrasive jet can be cleaned and cut at lower pressure. Although abrasive jet has many advantages, there are still some problems in high pressure water jet cleaning technology in our country, including the selection of nozzle and the inadequate selection of parameters, which will lead to the low efficiency of cleaning equipment. The abrasive jet can not give full play to its own advantages, so the nozzle can be said to be the core part of the whole equipment. In order to investigate the influence of nozzle structure parameters on jet flow, because the mixture of abrasive and water belongs to solid-liquid two-phase flow, it is not possible to rely on theoretical analysis alone, and it is difficult to obtain ideal results through experimental observation. In this paper, numerical simulation method is used to analyze the internal and external flow field of the pre-mixed abrasive jet nozzle. In order to investigate the influence of nozzle structure parameters on the flow field inside and outside the nozzle, the structure modeling, numerical simulation and data post-processing are realized by Gambit,Fluent,Origin software. According to the data processing results, the influence of different structure parameters (cylinder length, shrinkage angle, arc length) on jet velocity can be summarized, and it is concluded that streamline nozzle is more suitable for cleaning. Finally, aiming at the streamline nozzle for cleaning, by changing the parameters such as cylinder length, arc length and shrinkage angle, the effects of different cylinder length, arc length and shrinkage angle on the internal and external flow field of the nozzle are analyzed and compared. In addition, the influence of abrasive concentration on jet performance is analyzed. The results show that the diameter of inlet and outlet is 6mm, the diameter of outlet is 1mm, the length of cylinder is 6mm, and the length of arc is 8mm. The streamline nozzle with shrinkage angle of 17 擄is suitable for cleaning when the abrasive concentration is between 20% and 30%. In numerical simulation and parameter optimization, not only the axial velocity distribution and attenuation degree of water and sand are considered, but also the velocity distributions of water and sand in different jet sections are analyzed. The influence of different structure parameters on jet performance and the type of nozzle which is more suitable for cleaning are explored, which provides a theoretical basis for the design of water jet nozzle with excellent structure and high efficiency.
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG664
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