Numerical studies of air flow in the two-dimensional Venturi tube

• Main Author: 邱怡樺
• Other Authors: 李嘉塗
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/04612720396922824346

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 101 === Experimental me surements are theoretical analysis and numerical methods based, howeer, tend to be the model to achieve and numerical size, flow field environment, human factors and measurement accuracy limitations, and the need to invest relatively more funding, manpower and material resources.CFD method overco es the theoretical analysis and experimental study weaknesses, using computer calculations, convenient and fast to show the gasflow situations. In the natural environment and engineering pparatus flow is usually turbulent flow, according to the model of the required number of differential equations, equation model can be divided into the zero (algebraic equation model), both single programming model and the model equations.The simulation studies using FLUENT-2Dsolver,based on a two-dimensional funnel-shaped nozzle, the use of low pressure difference at both ends, using the Spalart-Allmaras one equation turbulence model, in order to observe the gas flow in the nozzle of the various states. The results show that the greater the atmospheric pressure inlet, nozzle air pressure inside the greater; pressure setting at the entrance to the greater airflow through the central vents, the air pressure although the decline, but the wall pressure rise; spray the pressure on the wall surface of a long tube group and the group of low flow in the nozzle long flowing faster than shorter I nozzle set fast; fluid temperature inside the nozzle side, showed now though is the fluid velocity at the nozzle tube fastest, but the average temperature is the lowest tube; fluid concentration in the nozzle, the throat of the nozzle part of the fluid density is the lowest part of the whole; fluid pressure inside the nozzle has a significant correlation with the concentration of sex.