消泡压力对消泡率的影响及基于数值模拟的消泡器结构优化设计

Effect of defoaming pressure on defoaming rate and optimized design of foam breaking device based on numerical simulation

在泡沫钻进过程中,现有的消泡器往往不能很好地达到消泡的目的。笔者建立了消泡器室内试验台,进行了消泡压力对消泡器消泡能力的影响试验,通过测试不同压力与不同泵转速确定了消泡压力与消泡率的关系,同时借助FLUENT软件对消泡器的扩散管和消泡管内部的压力分布,进行了数值模拟与分析。根据分析结果对消泡器进行了优化设计,将消泡管的长度从15cm增加至65cm。对改进后的消泡器进行室内试验,其消泡率达到80%左右。

The existing foam breaking device usually can not properly achieve the requirements of defoaming in the process of foam drilling.The indoor test-bed of foam breaking device was established to do influence test of defoaming pressure to defoaming ability.The relationship between defoaming pressure and defoaming rate was determined based on testing different pressures and pump revolution speeds,and FLUENT software was used to make numerical simulation and analysis to the pressure distribution inside diffusion and defoaming pipes of foam breaking device.According to analysis results,the foaming breaking device was optimally designed by increasing the length of defoaming pipe from 15 cm to 65 cm.The indoor test results indicate that the defoaming rate of modified foam breaking device reached to about 80%.