本文關(guān)鍵詞： 節(jié)水灌溉 分區(qū)灌溉 集中分配 切換轉(zhuǎn)閥 結(jié)構(gòu)設(shè)計(jì)　出處：《昆明理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：節(jié)水灌溉可有效提高作物水分利用率,降低水資源消耗。分區(qū)交替灌溉是后發(fā)展起來(lái)的一種節(jié)水灌溉技術(shù),節(jié)水性好,有利于提升作物品質(zhì)。但分區(qū)交替灌溉裝置大多存在結(jié)構(gòu)復(fù)雜、成本昂貴等問(wèn)題,一定程度上限制了分區(qū)交替灌溉技術(shù)的應(yīng)用與推廣。本文在現(xiàn)有節(jié)水灌溉裝置基礎(chǔ)上,結(jié)合交替灌溉技術(shù)原理,設(shè)計(jì)了集中分配切換轉(zhuǎn)閥,可實(shí)現(xiàn)不同路徑的切換,對(duì)切換管道殘留液及時(shí)回流,降低灌溉損耗。此外,還可實(shí)現(xiàn)多路供液,擴(kuò)展集中分配切換轉(zhuǎn)閥的功用范圍。調(diào)節(jié)閥芯位置,控制閥口開(kāi)度,可控制分配流量的大小,以滿足不同灌溉需求。本文運(yùn)用FLUENT軟件,對(duì)集中分配切換轉(zhuǎn)閥換向流道流場(chǎng)仿真,比較了圓形拐角換向流道和直角拐角換向流道在不同閥口開(kāi)度下的壓力場(chǎng)分布和速度場(chǎng)分布,表明圓形拐角和直角拐角兩種換向流道的流場(chǎng)特性差別并不顯著,從加工成本考慮,選用直角拐角作為集中分配切換轉(zhuǎn)閥的換向流道。對(duì)集中分配切換轉(zhuǎn)閥單路切換和多路切換兩種供流模式的流場(chǎng)仿真,比較了不同閥口開(kāi)度下的速度場(chǎng)分布、壓力場(chǎng)分布及出口質(zhì)量流量,分析了工作壓力和閥口開(kāi)度對(duì)兩種供流模式的性能影響,表明單路切換和多路切換的最佳工作壓力均為0.3～0.5MPa,最佳閥口開(kāi)度分別為75%～100%和50%。運(yùn)用FLUENT和ABAQUS軟件對(duì)圓弧滑動(dòng)面密封裝置流場(chǎng)及應(yīng)力應(yīng)變仿真,表明星形密封結(jié)構(gòu)較優(yōu),具有一定的自補(bǔ)償功能,經(jīng)試驗(yàn)密封性可靠。
[Abstract]:Water-saving irrigation can effectively improve crop water use efficiency and reduce water consumption. Alternate irrigation is a kind of water-saving irrigation technology developed after the development of good water-saving. It is beneficial to improve the quality of crops, but most of the alternative irrigation devices have complex structure and high cost. To a certain extent, the application and popularization of alternative irrigation technology is limited. Based on the existing water-saving irrigation equipment and combining with the principle of alternative irrigation technology, a centralized distribution switch valve is designed. It can realize the switch of different paths, return the residual liquid in time, reduce irrigation loss. In addition, it can realize multi-channel liquid supply, expand the function range of centralized distribution of switch valve, and adjust the position of valve core. Control valve opening can control the size of distribution flow to meet different irrigation requirements. In this paper, FLUENT software is used to simulate the flow field of the reversing channel of the centralized distribution switch valve. The pressure field distribution and velocity field distribution of circular corner commutative channel and right corner commutative channel under different opening degree of valve are compared. It shows that the flow field characteristics of circular corner and right corner are not significant. Considering the processing cost, the right corner is chosen as the reversing passage of the centralized distribution switch valve. The flow field simulation of the two flow modes of the centralized distribution switching valve is carried out, namely, the single-way switch and the multi-channel switching. The distribution of velocity field, pressure field and outlet mass flow under different opening degree of valve were compared, and the effects of working pressure and opening degree of valve on the performance of two flow modes were analyzed. The results show that the optimal working pressure for both single-channel switching and multi-channel switching is 0.3? 0. 5 MPA. The optimum opening of valve is 75% and 50% respectively. The flow field and stress strain of circular sliding surface sealing device are simulated by FLUENT and ABAQUS software, which shows that the star seal structure is better. It has certain function of self-compensation, and is reliable after testing.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：S277.9

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本文編號(hào)：1469591