Flowfield Analysis of a 3/2 Solenoid Valve

• Main Authors: Yu-Min - Lin, 林郁民
• Other Authors: Sheam-Chyun Lin
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/7mg64m

碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === Pneumatic solenoid valve has been widely used in the vehicle control systems for meeting the rapid-reaction demand triggered by the dynamic conditions encountered during the driving course of vehicle. For ensuring the safety of human being, the reliable and effective solenoid valve is in great demand to shorten the reaction time and thus becomes the topic of this research. This numerical study chooses a commercial 3/2-way solenoid valve as the reference valve for analyzing its performance. At first, CFD software Fluent is adopted to simulate the steady flow field associated with the valve configuration. Then, the comprehensive flow visualization is implemented to identify the locations of adverse flow patterns, which are critical for proposing the improving alternatives. Accordingly, it is found that a high-pressure region exists in the region between the nozzle exit and the top of spool. Thereafter, a parametric study on the nozzle diameter and the distance between nozzle and spool top is imposed to understand their influences on the pressure response characteristics of valve. Moreover, the unsteady CFD simulation is carried out on the electromagnetic valve to attain the transient characteristics for estimating the pressure response time, which will be compared with international Tier-1 standard later. Consequently, this numerical analysis shows that the pressure response time is reduced for an increasing nozzle diameter and an enlarged distance between the nozzle and the spool. Also, all the valve designs considered here meet with the standard of Tier 1. In conclusion, this work successfully establishes a rigorous and systematic CFD scheme, combined the steady and unsteady simulations, to evaluate the performance of pneumatic solenoid valve. Also, it provides the important information regarding the key design parameters of solenoid valve.