本文選題：自振脈沖氣液射流　切入點：煤巖　出處：《中國礦業(yè)大學學報》2015年06期 　論文類型：期刊論文

【摘要】：為提高射流利用率,提出一種基于自吸滲氣方法的自振脈沖氣液射流,基于水聲學與流體動力學理論建立其頻率模型,并通過考察射流沖擊作用下等強度懸臂梁振動的加速度變化規(guī)律分析射流頻率特性,繼而以煤巖體為試件檢驗射流沖蝕效果.結果表明,自振脈沖氣液射流的振蕩頻率隨含氣率α上升在初始段急劇衰減,在α=0.5達到極小值;射靶實驗表明脈沖氣液射流振蕩頻率隨腔長L增加呈遞減趨勢,而加速度隨無量綱腔長變化在L/d1(d1上噴嘴直徑)≈2.2出現(xiàn)一極大值,且極值點位置較自振脈沖水射流(L/d1≈2.5)左移;煤巖沖蝕實驗顯示脈沖氣液射流最大沖蝕體積較自振脈沖水射流提高約44%,且兩者極值處對應的腔長與射靶實驗結果極為接近.
[Abstract]:In order to improve the efficiency of jet utilization, a self-oscillating pulse gas-liquid jet based on self-suction gas was proposed, and its frequency model was established based on the theory of hydroacoustics and hydrodynamics. The frequency characteristics of the jet are analyzed by investigating the acceleration variation of the vibration of the cantilever beam with equal strength under the action of jet impingement, and then the erosion effect of the jet is tested with the coal and rock mass as the specimen. The results show that, The oscillation frequency of the self-oscillating pulse gas-liquid jet decreases sharply with the increase of the gas holdup 偽 in the initial stage, and reaches the minimum value at 偽 ~ (0.5), and the target shooting experiment shows that the oscillation frequency of the pulsed gas-liquid jet decreases with the increase of the cavity length L. However, the acceleration varies with the length of the dimensionless cavity at the nozzle diameter of L / D _ 1 / d _ 1) = 2.2, and the position of the maximum point is shifted to the left than that of the self-oscillating pulsed water jet (L / D _ 1 鈮，

本文編號：1559966