虹吸管道坡度对气液两相流动特性影响的试验研究

发布时间：2019-02-24 19:18

【摘要】：为了探明坡度对中行管段倾斜布置的正虹吸管路水力特性的影响,设置11个不同坡度(0、±1/60、±1/30、±1/20、±1/15、±1/10)和2个安装高度(4、6 m)在不同水位差下量测了虹吸管内的气液两相流动现象、含气率、气泡的运动速度、过流能力及总水头损失等水力特性。通过试验得到了正坡和逆坡管路坡度变化对管路水气流动现象的影响规律,揭示了坡度改变对管内含气率和气泡运动速度、虹吸管路流量及管路水头损失的影响规律,并结合理论分析探讨了气体存在对流量和总水头损失的影响。结果表明,随着坡度逐渐增大,管内伪空化现象逐渐减弱,气体的体积逐渐减小,含气率逐渐减小,气泡运动速度逐渐加快,虹吸管路的输水流量逐渐增大,总水头损失也逐渐增大。通过量纲分析的方法,推导出适用于倾斜布置的不同坡度下正虹吸管路输水流量的计算公式;经验证,公式计算值与实测值相接近,逆坡管路中相对误差控制在±6%,正坡管路控制在±7%。以上探究结果为实际工程中管路布置形式提供了参考依据。
[Abstract]:In order to find out the effect of slope on the hydraulic characteristics of the positive siphon in the middle bank, 11 different slopes were set up (0, 卤1 / 60, 卤1 / 30, 卤1 / 20, 卤1 / 15, 0, 卤1 / 30, 卤1 / 20, 卤1 / 15, 0, 卤1 / 60, 卤1 / 30, 卤1 / 20, 卤1 / 15). 卤1 / 10) and two mounting heights (4m) were used to measure the gas-liquid two-phase flow phenomena in siphons under different water levels, such as gas holdup, velocity of bubble motion, overflow capacity and total head loss. Through experiments, the influence law of slope change on water vapor flow in pipe is obtained, and the influence of slope change on gas content and bubble velocity, siphon flow rate and water head loss in pipe are revealed. The influence of the existence of gas on the flow rate and total head loss is discussed. The results show that with the increase of slope, the pseudo-cavitation in the pipe decreases gradually, the volume of gas decreases, the gas holdup decreases, the velocity of the bubble moves faster, and the flow of water in the siphon increases gradually. The total head loss is also gradually increasing. Through dimensional analysis, the formula for calculating the water flow rate of positive siphon pipeline under different slopes is derived. It is verified that the calculated value of the formula is close to the measured value, the relative error of the inverse slope pipe is controlled at 卤6 and the positive slope pipe is controlled at 卤7. The above results provide a reference basis for pipeline layout in practical engineering.
【作者单位】：新疆农业大学水利与土木工程学院;新疆农业大学计算机与信息工程学院;
【基金】：国家自然科学基金资助项目(51369031)
【分类号】：TV134;TV672.5

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