【作者】 宁锋；

【导师】 高传昌；

【作者基本信息】 华北水利水电学院 ， 流体机械及工程， 2007， 硕士

【摘要】 国内外大量的实验证明,脉冲射流能提高射流泵的传能及传质效率。本文在前人的研究基础上,分别对恒定、脉冲液体射流泵内部流场进行了数值模拟,并对脉冲液体射流泵的性能进行了试验研究。本文主要做了以下工作:第一章阐述了脉冲射流研究的意义及现状;第二章介绍了恒定、脉冲液体射流泵基本性能方程、脉冲时均值基本性能方程,并对脉冲液体射流泵时均值基本性能方程中的流速系数进行了理论研究;第三章介绍了数值模拟的概念、作用、局限性和常用的湍流数学模型及数值计算方法,并简单介绍了FLUENT软件;第四章运用计算流体力学,分别对恒定、脉冲液体射流泵的内部流场进行了数值模拟。首次对脉冲液体射流泵在不同面积比、不同喉管长、不同工况下的喉管内部流场进行了数值模拟,分析提出了脉冲液体射流泵的最优喉管长度范围;第五章对恒定、脉冲液体射流泵的基本性能进行了试验研究,对比试验结果和数值模拟结果,二者吻合较好。本文提出的脉冲液体射流泵最优喉管长度范围基本正确。更多还原

【Abstract】 Lots of experiments home and abroad have approved that pulsed jet could enhance jet pump’s energy and quality transmission efficiency. This dissertation, on the basis of the former study, simulated the steady and pulsed liquid jet pump’s internal flow field, then did experiment research on the performance of pulsed liquid jet pump. The main contents of the dissertation can be described as follow:In chapter 1, the dissertation elaborated the significance and present situation of study towards pulsed jet; In chapter 2, it introduced the fundamental performance equation of steady and pulsed liquid jet pump, also introduced time-average equation, then did some theoretical researches on the velocity coefficients in the equations; In chapter 3, it introduced the conception of numerical simulation and its function, limiting, including its turbulence math model and the method of numerical calculation in common use. Then it gave a brief introduction of FLUENT; In chapter 4, the dissertation did numerical simulation towards steady and pulsed liquid jet pump’s internal flow field by applying Computational Fluid Dynamics. It firstly did numerical simulation towards pulsed liquid jet pump’s throat pipe when it was working on different area ratio, different length of throat pipe, different working situation. Then it analyzed and proposed the optimization length of throat pipe on pulsed liquid jet pump; In chapter 5, it did experimental study on the fundamental performance of steady and pulsed liquid jet pump, then compared the experiment result with numerical simulation result, this approximately agreed with each other. The analyse of this research that the optimization length of throat pipe on pulsed liquid jet pump is approximately correct.更多还原