因應全球在太空探索的快速發展，太空等級之零部件製造技術僅掌握在少數國家手上，為了使我國在太空發展上能夠不受限制，因此有必要提升自主研發太空等級部件的相關能力。在本次的研究中製作出一顆能應用於液態推進之電磁閥，為了使設計之電磁閥能達到預期之規格，因此進行了一系列的設計與測試，透過使用CAD軟體進行幾何外形之設計，再透過CAE軟體對電磁閥之流量和柱塞所受之電磁力進行評估，待各項參數皆符合預期規格後即進行加工製造，隨後對加工之完成品進行了各項性能參數的量測。本次設計之電磁閥出口口徑為0.7 mm，在軸心纏繞之漆包線線徑為0.25 mm，共纏繞1300圈。完成之雛形件經測試發現在壓力5 bar至25 bar間流量與壓力呈線性變化，CV值經計算後0.015，其開啟所需消耗之電功率約為25 W，開啟反應時間為4.42 ms，達成設定之目標。而在流場模擬過程中發現於電磁閥出口處出現一明顯之低壓區，此低壓區將會使閥件內部產生空蝕現象，而導致其金屬表面受到破壞導致使用壽命縮短，此研究發現在出口轉角處加入斜角之設計能夠有效得縮小低壓區，並減少壓差之產生，亦發現出口流量將隨著壓差縮小而有上升之趨勢，磁場部分則可透過後續優化電磁線圈之參數以降低消耗之功率並縮短開啟延遲時間。

In response to the rapid advancement of global space exploration, the production of space-grade parts is currently limited to a handful of countries. To ensure our nation's unrestricted progress in space development, we must enhance our capabilities for independent research and development of space-grade parts. A solenoid valve suitable for liquid propulsion has been fabricated as part of this research endeavor. The geometric configuration was determined using computer-aided design (CAD) software, followed by evaluating the flow rate and electromagnetic force on the plunger using computer-aided engineering (CAE) software. Once all parameters align with the anticipated specifications, manufacturing processes will be initiated, and the final product will be subjected to comprehensive performance evaluations. The calculated CV value stood at 0.015, with an approximate 25 W electrical power requirement for opening and a responsive opening time of 4.42 ms, accomplishing the predetermined objectives. Testing the completed prototype revealed a linear variation in flow rate and pressure within the 5 to 25 bar range. During the simulation of the flow field, an apparent low-pressure zone was identified at the outlet of the solenoid valve, which could potentially lead to cavitation corrosion within the valve, thereby compromising its structural integrity and longevity. Incorporating a beveled design at the outlet corner effectively mitigates the low-pressure zone, consequently reducing the generation of pressure differentials. Optimization of the electromagnetic coil parameters could further enhance the magnetic field, resulting in reduced power consumption and minimized turn-on delay time.

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