【作者】 朱志彬；

【导师】 林榕端；

【作者基本信息】 广西大学 ， 化工过程机械， 2004， 硕士

【摘要】 本文对内置自旋弹簧换热管工作特性进行了试验研究并应用有限元数值计算方法对换热管内液轮机流场进行了模拟分析。首先设计了九种具有不同结构参数的弹簧试件，采用试验方法研究换热管内置入自旋弹簧的转动特性和流体阻力特性以及强化传热性能；通过对多组试验结果的比较分析，得出了无量纲参数D₁／S、D₁／D₀对换热管内自旋弹簧的转动特性和流体阻力特性的影响规律，并在大量试验数据的基础上归纳出一个换热管内自旋弹簧工作性能的综合评判准则——Lz准数。接下来提出了一种应用Matlab非线性回归分析与Wilson图解法修正相结合的数据处理新方法，用以由传热试验数据推求出换热管内流体给热系数关联式。 本文还采用了大型有限元分析软件ANSYS／FLOTRAN CFD模拟置入微型液轮机后换热管内流场的速度分布和压力分布情况，得出的结果与试验研究结果相符，验证了该方法的可靠性和关于微型液轮机的动力学研究成果。分析结果表明，利用有限元法来计算液轮机流场的流体阻力降的结果是可信，可以利用该方法预测换热管内液轮机流场的分布甚至可以代替部分试验。 Lz准数的归纳提出、Matlab非线性回归分析与Wislon图解法修正相结合的数据处理新方法的提出应用以及采用ANSYS有限元数值模拟探讨换热管内微型液轮机的流动问题是本文的创新点和亮点。本文所做的这些工作，可以为同类内插件的继续深入研究及工业生产应用提供有价值的参考。通过对内置自旋弹簧换热管工作特性的研究和管内液轮机流场的分析，有助于提高换热管的强化传热效果，对节能、降耗和环保等具有重要意义。更多还原

【Abstract】 In this paper, an experimental investigation on the working characteristics of built-in rotatable spring heat exchanger tube is conducted and applying finite element numerical simulation method the flow field of miniature hydraulic turbine inside heat exchanger tube is analyzed.Firstly, nine springs with different construction parameter are designed to the experiment for investigating the rotation performance, flow and heat transfer characteristics of heat exchanger tube with rotatable spring inserted. According to lots of experimental results, it is found that the number D1/S and D1/D0 have an effect on the rotation performances and flow resistance characteristics of the rotatable spring in the heat exchanger tube, and the influence regulation is acquired from the comparison and analysis. Based on large quantity experiment data, the working performance criterion of rotatable spring is generalized. And then a mean that ascertains the relating equation of the convection heat transfer coefficient in the heat exchanger tube with Matlab nonlinear regress and Wilson method is brought forward.The thesis also simulates the distributing of velocity and pressure of the flow field of miniature hydraulic turbine inside heat exchanger tube with ANSYS software. The ANSYS computational solution accords with the experiment result, which proves that the numerical simulation method is reliable and the dynamics research production is right. The result of analysis shows that the flow resistance computed by finite element method is credible, then the method can be used to forecast the distributing of flow field of miniature hydraulic turbine inside heat exchanger tube moreover substitute parts of experiment.The work of this paper will be useful to the same kinds of inserts’ continuative in-depth study and the application in the industry. The investigation on the working characteristics of built-in rotatable spring heat exchanger tube and the analysis of theflow field of miniature hydraulic turbine inside heat exchanger tube are contribute to the improvement of enhanced heat transfer, which has great significance to energy saving, consumption drop and environmental protection.更多还原