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Overflow Dyeing Machine Nozzle Flow Field Analysis and Structure Design Based on CFD

Author: ZhangChaoYang
Tutor: ZuoXiangBo
School: Jinan University
Course: Mechanical Design and Theory
Keywords: Overflow dyeing machine nozzle CFD Two-phase flow Numerical Simulation Drums phenomenon Fabric kink phenomenon
CLC: TS193.3
Type: Master's thesis
Year: 2011
Downloads: 64
Quote: 0
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Abstract


The the overflow dyeing machine dyeing cylinder of nozzle common fabric kinks and the phenomenon of the \To solve this problem, subject to overflow dyeing machine nozzle flow field using Solidworks software overflow dyeing machine nozzle geometry model, based on the state of the flow field and the actual working conditions, establishment of a mathematical model of the nozzle flow field, the use of computational fluid dynamics software to simulate and analyze the simulation results, analyze the transport properties of the nozzle flow field, thereby improving the nozzle structure. Nozzle flow field of mathematical modeling, based on the local transient characteristics of gas-liquid two-phase flow, ignoring fabric jet media, the establishment of a continuous gas-liquid two-phase flow and momentum equations, the use of volume averaging method volume equation average derived macro-liquid two-phase conservation equations. Analysis overflow dyeing machine nozzle gas-liquid two-phase flow parameters under actual working conditions, state of the flow field, and as a basis, select the RNG k-ε numerical model as closed model nozzle flow field of mathematical modeling, closed gas-liquid The two-phase flow continuity equation and momentum square Finding Conservation equations. Computer Solution in order to facilitate the use of the discrete method, partial differential equations are converted into ordinary differential equations. To solve the problem of the coupling of the pressure and speed, the subject SIMPLEST algorithm to establish the pressure correction equation on the basis of the continuity equation for the discrete boundary conditions combined with the nozzle flow field, solving the correction pressure to fix the speed of the flow field using the obtained correction pressure distribution. According to the calculation results of the CFD simulation analysis nozzle cap gas dynamic changes in static pressure, and nozzle dyebath distribution of velocity and pressure field; spiral flow from the pumping action of the eddy current, secondary flow, turbulent energy transfer and several other aspects to analyze the transport of the nozzle flow field according to the results of simulation analysis, combined with the principles of the knowledge of physics and the Gibbs adsorption formula, explore the reasons drums and the formation process of fabric dyeing; The results showed that the: the holes dyebath vortex strength is the major factor causing the change of the gas pressure within the nozzle, the scroll is the stronger, the greater the change of gas pressure; nozzle bends produced at the secondary flow to form a spiral flow of the main factors, spiral flow of the fabric kink, seriously affecting the quality of the fabric dyeing; passing through the regulation of energy between the large-scale vortex with small scale eddies, reducing the amount of secondary flow generated in the nozzle elbow, adjustable nozzle bends within small scale vortex energy spiral flow within the elbow, thereby weakening the impact on the fabric of the kink phenomenon. While the the the cylindrical fabric dyeing drums phenomenon spiral flow generated by the nozzle elbow resulting fabric kinks the cylindrical fabric external pressure of different factors caused. Solution temperature, the decrease in solubility of the gas in water to produce bubbles, the suction effect of the vortex so that the gas pressure in the nozzle is reduced, the water vapor is generated when the outside from the nozzle into the nozzle of the gas and the high temperature dyeing \the main source of the gas. According to the analysis results and production practice, the pair of circular nozzle structure improvement, flow adjustment plates in the nozzle core seat add 4 kink phenomenon of the fabric can be eliminated, the size control of the drums within a favorable range for fabric staining.

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CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > Dyeing and finishing industry > Dyeing > Machinery and equipment
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