本文選題：沼液泵 + 水力設(shè)計��； 參考：《蘭州理工大學(xué)》2011年碩士論文

【摘要】：近年來,在國家一系列惠農(nóng)政策的推動下,農(nóng)村沼氣建設(shè)得到了快速發(fā)展。但是在沼氣池的使用過程中,由于沼渣沼液中含有殘余沼氣,致使沼渣沼液難以清除,在農(nóng)村廢棄沼氣池的現(xiàn)象較為普遍。為了解決農(nóng)村沼氣池除渣除液難的問題,本課題結(jié)合農(nóng)戶用電、沼氣池結(jié)構(gòu)、容積以及目前沼渣沼液清除的狀況研發(fā)雙流道式戶用沼液泵。 本課題以沼液泵作為研究對象,通過對沼液泵全流場水力設(shè)計、過流部件三維造型及CFD數(shù)值模擬,對其性能進行了預(yù)測與分析,取得的研究成果如下: 1.根據(jù)我國農(nóng)村地區(qū)大力推廣的地下式沼氣池結(jié)構(gòu)、容積,確定了沼液泵的設(shè)計參數(shù)和結(jié)構(gòu)形式。該泵電機置于池面、泵體潛入沼液,電機采用220伏交流電動機,沼液泵重量輕、移動方便、操作簡單、安全可靠。 2.流道中線的確定是雙流道泵設(shè)計的關(guān)鍵技術(shù)。本課題比較了兩種阿基米德螺旋線的曲率變化情況,給出了雙流道葉輪流道中線方程的選擇依據(jù)。 3.利用Pro/Engineer軟件良好的三維造型功能,對沼液泵過流部件進行三維造型。通過編入阿基米德螺旋線公式的方法生成葉輪流道中線,這樣生成的流道中線快速、準(zhǔn)確,葉輪的實體造型更加精確。 4.本課題結(jié)合分析了流道中線對葉輪造型的影響。在葉輪實體造型過程中,流道斷面在空間中容易相交,導(dǎo)致葉輪流道造型失敗。因此,單純的葉輪平面水力設(shè)計不能保證形成光滑的內(nèi)流道。此時葉輪的三維實體造型可以對其進行校核。在不能生成光滑的內(nèi)流道時,可以依次修改斷面空間安放角度、流道過流斷面面積變化規(guī)律、流道中線方程,最終得到光滑的葉輪流道。 5.利用CFD技術(shù)對沼液泵在清水、固液兩相介質(zhì)下進行全流場定常數(shù)值模擬計算。為了得到固相顆粒直徑、濃度對泵性能的影響規(guī)律,對沼液泵在設(shè)計工況下分別輸送相同固相濃度、不同顆粒直徑和相同顆粒直徑、不同固相濃度的固液兩相介質(zhì)進行模擬計算。通過對內(nèi)部流場數(shù)值模擬結(jié)果分析得到了沼液泵在輸送兩相流介質(zhì)時的水力性能變化及流道磨損情況,為進一步深入研究沼液泵奠定了一定理論基礎(chǔ)。 6.研究表明,本課題所設(shè)計的沼液泵符合給定設(shè)計參數(shù)及性能的要求;說明沼液泵的水力設(shè)計是合理的;雙流道泵作為沼液泵能滿足戶用沼氣池清除沼渣沼液的要求;該結(jié)構(gòu)形式的沼液泵具有重大的推廣價值。
[Abstract]:In recent years, under the promotion of a series of favorable agricultural policies, rural biogas construction has developed rapidly. However, in the use of biogas digesters, the residue biogas contained in the biogas sludge is difficult to remove, and the phenomenon of waste biogas digesters in rural areas is relatively common. In order to solve the problem that it is difficult to remove sludge from rural biogas digesters, this project combines household electricity consumption, biogas digester structure, volume and current situation of biogas sludge removal to develop a double-channel household biogas pump. This paper takes the biogas liquid pump as the research object, through the hydraulic design of the whole flow field of the biogas liquid pump, the three-dimensional modeling of the flow parts and the numerical simulation of CFD, the performance of the biogas pump is predicted and analyzed. The research results are as follows: 1. According to the structure and volume of underground biogas digesters popularized in rural areas of China, the design parameters and structural forms of biogas liquid pumps are determined. The pump motor is placed on the surface of the pool, the pump body submerges into the biogas liquid, the motor adopts 220V AC motor, the biogas pump is light in weight, easy to move, easy to operate, safe and reliable. The determination of flow channel midline is the key technology in the design of double channel pump. In this paper, the curvature changes of two Archimedes helix are compared, and the selection basis of the middle line equation of the double channel impeller runner is given. Using the good 3D modeling function of Pro / engineer software, the flow parts of biogas liquid pump are modeled. Through the method of compiling Archimedes helix formula to generate the impeller runner midline, the flow channel midline is fast and accurate, and the solid shape of impeller is more accurate. 4. In this paper, the influence of runner midline on impeller modeling is analyzed. In the process of impeller solid modeling, the flow channel section intersects easily in space, which leads to the failure of impeller runner modeling. Therefore, the simple hydraulic design of impeller plane can not guarantee the formation of smooth internal flow channel. The three-dimensional solid modeling of impeller can be checked. When the smooth inner passage can not be generated, the angle of section space can be modified in turn, the changing law of flow passage cross section area, the middle line equation of runner can be obtained, and the smooth impeller passage can be obtained finally. 5. CFD technique is used to simulate the steady flow field of biogas pump in clear water and solid-liquid two-phase medium. In order to obtain the influence of solid particle diameter and concentration on pump performance, the biogas liquid pump was used to transport the same solid concentration, different particle diameter and the same particle diameter respectively under the design conditions. The solid-liquid two-phase medium with different solid concentration was simulated and calculated. Through the analysis of the numerical simulation results of internal flow field, the hydraulic performance of biogas liquid pump and the wear of flow channel are obtained, which lays a certain theoretical foundation for further study of biogas fluid pump. The research shows that the biogas liquid pump designed in this paper meets the requirements of the given design parameters and performance, and shows that the hydraulic design of the biogas pump is reasonable, and that as the biogas liquid pump, the double-channel pump can meet the requirements of the household biogas digester for the removal of biogas residue biogas. The biogas liquid pump with this structure has great popularizing value.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH38

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