Numerical and Experimental Study on Flow Effects of Pneumatic Proportional Pressure Valve

氣動式比例壓力閥流場特性計算與實驗研究

謝宗翰(Tzong-Hann Shieh) ； 葉俊良(Chun-Liang Yeh) ； 陳郁澧(Yu-Li Chen) ； 蕭長鑫(Charng-Chin Hsiao)

《中國機械工程學刊》 41卷2期 (2020/04) Pp. 149-158

摘要

This study developed a novel system for the measurement of pressure within an SMC-ITV2030-012BL pneumatic proportional pressure valves. We also constructed a precise three-dimensional structure of the channel within the valve to examine the aerodynamic characteristics of the internal flow field using the finite volume method and Reynolds-averaged Navier-Stokes equations. We first compared the aerodynamic characteristics resulting from opening the valve 70% using completely or partially encrypted grid models. We then considered various wall structures at the inlet and outlet of the flow channel with the same valve opening. Finally, we compared the results of simulation and experiments of the flow field within the valve. Finally, we investigated the flow field characteristics when the valve was opened 90%, 70%, and 50%. Experiment and simulation results show that the aerodynamic characteristics of the flow field are influenced by the wall structures of the valve and the opening of the valve as well as the grid encryption method that is employed.

關鍵字

Pneumatic ； Proportional pressure valve ； Solenoid valve ； Parametric analysis

並列摘要

本文採用新建構之氣動式量測系統，針對SMC-ITV2030-012BL氣動式比例壓力閥內部流道進行壓力量測實驗。此外，建構出該受測比例閥整體流道之精確三維幾何結構模型，並使用有限體積法，以雷諾平均求解Navier-Stokes方程，進行閥體內部流場特性之詳細計算與分析。本研究首先，針對70%閥口開度，透過流場網格整體加密與邊界層區域性網格加密兩種不同網格模型配置方式，進行流場氣動力參數特性之模擬與比較方析。其次，針對同一閥口開度，進一步考慮流道出入口處不同壁面幾何結構，進行閥體內部流道之三維流場計算模擬並與實驗結果進行比較。最後，將針對90%、70%與50%等三種不同閥口開度條件，進行流場變化的動態特性分析。由實驗與計算結果可知，流場邊界層網格、閥體壁面幾何結構和閥口開口比率的改變，均會對閥體結構的流場氣動力特性產生一定程度的影響。