發(fā)布時間：2018-10-09 17:46

【摘要】：近年來,交通運輸工具的廣泛應(yīng)用對支持全球的經(jīng)濟發(fā)展起到了巨大作用,然而傳統(tǒng)的運輸方式的多采用高碳能源,來自運輸過程中的碳排放對環(huán)境的影響已不容忽視。隨著人們對于低碳環(huán)保的呼聲越來越高,發(fā)展新型低碳輸送模式對于構(gòu)建綠色物流體系起到了舉足輕重的地位。 筒裝料管道水力輸送的是近年來新興的管道水力輸送技術(shù),它克服了許多傳統(tǒng)管道水力輸送模式的弊端,同時還兼具了輸送過程中無污染、低能耗等優(yōu)點,非常符合當(dāng)代物流運輸?shù)墓?jié)能環(huán)保要求,所以筒裝料水力輸送技術(shù)具有廣闊的發(fā)展前景和很高的應(yīng)用價值。 為了進一步豐富筒裝料管道水力輸送的研究內(nèi)容,同時完善縫隙流的相關(guān)理論,本文結(jié)合國家自然科學(xué)基金“管道縫隙螺旋流水力特性研究(51109115)”和“管道列車水力輸送能耗研究(51179116)”,以管道車在平直管段下的受力情況和縫隙流的流速分布特性為研究對象,依據(jù)理論分析、試驗研究和數(shù)值模擬相結(jié)合的技術(shù)路線,對選擇較優(yōu)車徑提供了三種方法,通過研究得到了以下成果： (1)分析得到了不同直徑管道車的初始壓差力及影響因素,進一步完善了關(guān)于管道車的初始起動條件的研究； (2)提出了基于輸送效率選擇較優(yōu)車徑的標準,即在一定的輸送總量、輸送距離和管道車長度的條件下能夠以較小能耗達到較快的輸送速度時所對應(yīng)的管道車車徑為較優(yōu)車徑； (3)從管道車容重比的角度出發(fā),提出了選擇較優(yōu)車徑的第一個方法(容重比法),即當(dāng)管道車整體與輸送流體之間的容重比最接近于1時,可認為該車型的直徑達到了較優(yōu)車徑； (4)根據(jù)管道車速度、管道水流平均流速和縫隙流平均流速三者的關(guān)系,提出了確定較優(yōu)車徑的第二種方法(平均流速法),即在穩(wěn)定運行的條件下,當(dāng)三者速度最為接近時所對應(yīng)的管道車車徑為較優(yōu)車徑； (5)依據(jù)試驗對管道車在穩(wěn)定運移狀態(tài)下所產(chǎn)生的縫隙流的流速分布規(guī)律的,提出了選擇較優(yōu)車徑的第三種方法(流速分布法),當(dāng)管道車穩(wěn)定運移時其縫隙流流速分布情況最接近于清水管道流速分布時,該管道車的車徑即為較優(yōu)車徑； (6)利用FLUENT軟件,對不同直徑管道車在平直管段穩(wěn)定運移狀態(tài)下的局部流速場進行了數(shù)值模擬,并和試驗數(shù)據(jù)數(shù)據(jù)進行對比驗證。本文將縫隙流研究與管道車運移特性相結(jié)合,補充了關(guān)于研究管道車運移特性的又一領(lǐng)域。
[Abstract]:In recent years, the wide application of transportation tools has played a great role in supporting the global economic development. However, the traditional transportation mode mostly uses high-carbon energy, and the impact of carbon emissions from the transportation process on the environment can not be ignored. With the increasing demand for low-carbon environmental protection, the development of a new low-carbon transport mode plays an important role in the construction of green logistics system. In recent years, the pipeline hydraulic conveying technology of barrel loading pipeline overcomes the disadvantages of many traditional pipeline hydraulic transportation modes, and also has the advantages of no pollution and low energy consumption in the course of transportation. It meets the requirements of energy saving and environmental protection of modern logistics transportation, so the hydraulic conveying technology of cylinder loading has broad development prospect and high application value. In order to further enrich the research content of hydraulic conveying in cylinder charging pipeline, and improve the relevant theory of slot flow at the same time, Combined with the National Natural Science Foundation of China "Research on the characteristics of Spiral flow Force in Pipeline slot (51109115)" and "study on Energy consumption of Pipeline Train hydraulic Transportation" (51179116), the research object of this paper is the stress situation of pipeline car under the flat pipe section and the velocity distribution characteristics of the slot flow. On the basis of theoretical analysis, experimental research and numerical simulation, three methods are provided for selecting better vehicle diameter. The main results are as follows: (1) the initial pressure difference force and its influencing factors of pipeline car with different diameters are analyzed, and the initial starting conditions of pipeline car are further improved; (2) the criterion of selecting better vehicle diameter based on transportation efficiency is put forward, that is, at a certain transportation amount, Under the condition of transportation distance and length of pipeline vehicle, the corresponding diameter of pipeline car can be better when the energy consumption is lower and the conveying speed is faster. (3) starting from the angle of volume weight ratio of pipeline car, The first method (bulk weight ratio method) for selecting better vehicle diameter is put forward, that is, when the bulk weight ratio between the whole pipeline car and the conveying fluid is closest to 1, the diameter of the vehicle can be considered to be the optimum diameter; (4) according to the speed of the pipeline car, The relationship between the average flow velocity of pipeline and the average velocity of crevice flow is discussed. The second method (average velocity method) for determining the optimum vehicle diameter is put forward, that is, under the condition of steady operation, (5) according to the experimental results, the velocity distribution of the slot flow produced by the pipeline vehicle under the condition of steady migration is studied. The third method (velocity distribution method) is proposed to select the optimal vehicle diameter. When the flow velocity distribution of the slot flow is the closest to the flow velocity distribution in the clear water pipeline, the diameter of the pipeline car is the better one. (6) using FLUENT software, the local velocity field of pipeline vehicles with different diameters is simulated under the steady migration condition in the straight section, and the results are compared with the experimental data. In this paper, the research of slot flow is combined with the characteristics of pipeline vehicle movement, which complements another field of research on the characteristics of pipeline vehicle movement.
【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】：2014
【分類號】：U171

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本文編號：2260205