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脈寬調(diào)制型噴頭電磁閥內(nèi)流動數(shù)值模擬
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    摘要:

    脈寬調(diào)制型噴頭廣泛用于變量噴霧中，其流量的變化主要通過電磁閥在一定時(shí)間內(nèi)開啟和閉合來實(shí)現(xiàn)的，利用CFD軟件對電磁閥內(nèi)部流動進(jìn)行數(shù)值模擬，研究電磁閥內(nèi)的流動特征。結(jié)果表明，電磁閥開啟瞬間出口處會形成負(fù)壓，產(chǎn)生氣體回流，延時(shí)期會有倒吸氣體排放，影響霧化質(zhì)量，同樣關(guān)閉延時(shí)期也會產(chǎn)生霧化不完整的情況。電磁閥開啟狀態(tài)時(shí)，出口壓力等于入口壓力，當(dāng)剛開啟和關(guān)閉時(shí)，流量和壓力達(dá)到峰值。另外在電磁閥剛開啟和閉合過程中，伴隨有渦旋運(yùn)動的產(chǎn)生、發(fā)展和輸運(yùn)的復(fù)雜過程。

    Abstract:

    A modulated spraying nozzle control system can be used for variable rate chemical application. The transient numerical simulation of high speed valve was modeled by CFD software Fluent to research the flowing character in the solenoid valve. The result showed that there was suction pressure generated at outlet of valve when it just opened, which would result in air-sucking and effect atomization quality, also at lapse in the shut down time of the valve, it was harmful for the atomization. When the valve was opening, the pressure of outlet was equal to that of inlet, when it was just opening, both the pressure and flow rate met the maximal level, with two zones increased sharply. The forming, developing and transporting complex process of vortex was found during the valve opening and closing.

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張波,吳春篤,張偉,楊學(xué)軍,儲金宇.脈寬調(diào)制型噴頭電磁閥內(nèi)流動數(shù)值模擬[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2008,39(12):78-81.[J]. Transactions of the Chinese Society for Agricultural Machinery,2008,39(12):78-81.

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