本文選題：細長密閉管道 + 油氣　； 參考：《振動與沖擊》2017年09期

【摘要】：針對長徑比對密閉管道內(nèi)汽油蒸汽和空氣的混合氣爆炸特性的影響進行實驗。研究表明:細長密閉管道內(nèi)的油氣爆炸壓力為兩階段上升,而壓力上升速率曲線呈現(xiàn)出"雙峰"結(jié)構(gòu);最大爆炸壓力和取得最大pmax值的最佳油氣濃度均隨管道長徑比L/D的增加逐漸減小;達到最大爆炸壓力所需時間隨管道長徑比L/D的增加呈線性關(guān)系增加,且靠近最佳油氣濃度的油氣受管道長徑比的影響較小,而偏離最佳油氣濃度較遠的油氣受管道長徑比的影響較大;隨著油氣濃度的增大,第二個壓力上升速率峰值先呈指數(shù)增長,達到峰值之后呈負指數(shù)下降;當油氣濃度低于臨界濃度時,第二個壓力上升速率峰值比第一個壓力上升速率峰值低,而高于臨界濃度時則反之;第一個和第二個壓力上升速率峰值及取得最大(dp/dt)max2值的油氣濃度均隨管道長徑比L/D的增加而降低。這些規(guī)律性的結(jié)論可為管道的防抑爆設(shè)計提供理論依據(jù)和重要參考。
[Abstract]:The effect of aspect ratio on the explosion characteristics of gasoline vapor and air mixture in a closed pipe was studied.The results show that the explosion pressure of the oil and gas in the slender closed pipeline is two stages rising, and the pressure rising rate curve shows a "double peak" structure.The maximum explosion pressure and the optimum oil and gas concentration to obtain the maximum pmax value decreased gradually with the increase of the L- / D ratio of the pipeline, and the time required to reach the maximum explosion pressure increased linearly with the increase of the L- / D ratio of the pipeline.And the oil and gas near the optimum oil and gas concentration is less affected by the ratio of length to diameter of the pipeline, while the oil and gas far away from the optimum concentration of oil and gas is affected by the ratio of length to diameter of the pipeline, and with the increase of the oil and gas concentration,The second peak pressure rise rate increases exponentially first, then decreases exponentially after reaching the peak value, and when the oil and gas concentration is below the critical concentration, the second pressure rise rate peak is lower than the first pressure rise rate peak.The first and second peak pressure rise rates and the oil and gas concentration of the maximum dp- dttnmax _ 2 value decrease with the increase of the L- / D ratio of the pipeline length to diameter ratio when the critical concentration is higher than the critical concentration.These regular conclusions can provide theoretical basis and important reference for the design of pipeline anti-explosion.
【作者單位】： 后勤工程學院供油系;
【基金】：國家自然科學基金項目(51276195)
【分類號】：X932
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本文編號：1769925