本文選題：自振脈沖氣液射流　切入點(diǎn)：煤巖　出處：《中國(guó)礦業(yè)大學(xué)學(xué)報(bào)》2015年06期 　論文類(lèi)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(xué)與流體動(dòng)力學(xué)理論建立其頻率模型,并通過(guò)考察射流沖擊作用下等強(qiáng)度懸臂梁振動(dòng)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(yàn)射流沖蝕效果.結(jié)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(dá)到極小值;射靶實(shí)驗(yàn)表明脈沖氣液射流振蕩頻率隨腔長(zhǎng)L增加呈遞減趨勢(shì),而加速度隨無(wú)量綱腔長(zhǎng)變化在L/d1(d1上噴嘴直徑)≈2.2出現(xiàn)一極大值,且極值點(diǎn)位置較自振脈沖水射流(L/d1≈2.5)左移;煤巖沖蝕實(shí)驗(yàn)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(duì)應(yīng)的腔長(zhǎng)與射靶實(shí)驗(yàn)結(jié)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(hào)：1559966