發(fā)布時間：2018-05-13 12:27

  本文選題：防爆柴油機 + 進氣系統(tǒng)��； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：防爆柴油機是礦業(yè)生產(chǎn)的主要動力源之一，憑借其燃燒熱效率高、燃油消耗率低以及使用安全、操作方便等優(yōu)點，應(yīng)用范圍越來越廣。但防爆柴油機進氣系統(tǒng)內(nèi)加裝了進氣柵欄、空氣關(guān)斷閥等防爆裝置，增加了進氣系統(tǒng)的進氣阻力，降低了柴油機的進氣充量和燃燒熱效率，導(dǎo)致其動力性和經(jīng)濟性降低。所以，探究如何減小防爆柴油機進氣系統(tǒng)的進氣阻力，對提升防爆柴油機的性能具有深遠的意義。 本文以6100型防爆柴油機為研究對象，運用計算流體動力學(xué)(CFD)和FLUENT分析軟件，對防爆柴油機進氣系統(tǒng)的進氣柵欄和進氣歧管進行內(nèi)部流場分析，選擇合理的進氣柵欄和進氣歧管結(jié)構(gòu)參數(shù)，增加進氣充量，提高各缸的進氣均勻性；從而改善防爆柴油機的性能。本文的主要研究內(nèi)容如下： 1）利用UG建模軟件建立6100防爆柴油機進氣防爆柵欄的流體動力學(xué)模型，應(yīng)用FLUENT軟件對進氣柵欄內(nèi)部流場進行了模擬研究，通過壓力分布、速度分布、湍動能分布來分析不同柵欄間隙對進氣量的影響。最終得出0.30mm柵欄間隙的進氣柵欄較為合理。 2）為了解決進氣防爆柵欄背壓大、進氣量小的問題，本文對進氣柵欄的結(jié)構(gòu)進行分析，選取進氣柵欄的進氣管長度、穩(wěn)壓腔角度以及柵欄縫隙間距這三個比較重要的因素，每個因素選取三個水平進行正交試驗分析，得出各因素對進氣量影響的主次順序，從而確定進氣柵欄最佳的結(jié)構(gòu)匹配方案。 3）應(yīng)用FLUENT軟件對6100防爆柴油機進氣歧管進行流場模擬計算，對歧管內(nèi)部進行流動特性分析，以流體力學(xué)為依據(jù)，對原設(shè)計進行改進，并對比分析了改進前后兩種進氣歧管結(jié)構(gòu)的出口截面速度、歧管內(nèi)的氣流流速及湍流動能。結(jié)果表明，減小穩(wěn)壓腔體積，在穩(wěn)壓腔與歧管之間設(shè)置一部分過渡段有利于改善柴油機各缸的進氣均勻性，增加進氣充量，進而提高柴油機的性能。 4）改變進氣總管和歧管的長度與直徑，運用GT-POWER軟件對其進行仿真優(yōu)化，之后根據(jù)動力性、燃油經(jīng)濟性為依據(jù)，挑選出最佳尺寸。根據(jù)整機的布置情況及分析結(jié)果表明，，減小總管和歧管長度，增加歧管直徑有利于提升發(fā)動機的性能。
[Abstract]:Explosion-proof diesel engine is one of the main power sources in mining industry. Because of its high combustion heat efficiency, low fuel consumption rate, safe use, easy operation and other advantages, the application of diesel engine is becoming more and more extensive. However, in the intake system of explosion-proof diesel engine, the blast proof devices such as intake fence and air shutoff valve are installed, which increases the intake resistance of the intake system, reduces the intake air charge and combustion heat efficiency of the diesel engine, and results in the decrease of its power and economy. Therefore, exploring how to reduce the intake resistance of explosion-proof diesel engine is of great significance to improve the performance of explosion-proof diesel engine. In this paper, the internal flow field of intake fence and intake manifold of intake system of explosion-proof diesel engine is analyzed by using computational fluid dynamics (CFD) and FLUENT software, taking 6100 type explosion-proof diesel engine as the research object. Reasonable intake fencing and intake manifold structure parameters are selected to increase intake air charge and improve the air intake uniformity of each cylinder so as to improve the performance of explosion-proof diesel engine. The main contents of this paper are as follows: 1) the fluid dynamics model of 6100 explosion-proof diesel engine is established by using UG modeling software, and the flow field inside the inlet air fence is simulated by FLUENT software. The pressure distribution and velocity distribution are used to simulate the flow field. The distribution of turbulent kinetic energy is used to analyze the influence of different fencing gaps on air intake. Finally, it is concluded that the air inlet fence with 0.30mm gap is more reasonable. 2) in order to solve the problem of high back pressure and low intake, the structure of intake fence is analyzed, and three important factors, such as the length of intake pipe, the angle of stable cavity and the gap spacing of fence, are selected. Three levels of each factor are selected for orthogonal experimental analysis, and the primary and secondary order of the influence of each factor on the air intake is obtained, so as to determine the optimal structure matching scheme of the air intake fence. 3) the flow field of intake manifold of 6100 explosion-proof diesel engine is simulated by using FLUENT software, and the flow characteristics inside the manifold are analyzed. Based on hydrodynamics, the original design is improved. The exit cross section velocities, the flow velocity and turbulent kinetic energy of the two kinds of intake manifold structures before and after the improvement are compared and analyzed. The results show that reducing the volume of the steady pressure chamber and setting a part of transition section between the stable pressure cavity and the manifold is beneficial to improve the uniformity of the intake of the diesel engine cylinder, increase the intake volume, and then improve the performance of the diesel engine. 4) changing the length and diameter of intake manifold and manifold, using GT-POWER software to simulate and optimize them, and then selecting the best size according to power performance and fuel economy. According to the arrangement of the whole machine and the analysis results, it is shown that reducing the length of the manifold and increasing the diameter of the manifold are beneficial to the performance of the engine.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD684;TK423

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