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摩擦产生的管道流量和水头损失实验报告

  • 发布日期:2013-01-17
  • 责任编辑:暖暖
  • 论文字数:2200
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  • 论文编号:fb201301111014506793
  • 论文类型:-
  • 论文价格:150
Pipe Flow and Head Loss due to Friction摩擦产生的管道流量和水头损失实验报告
 
Legitimate co-operation can be defined as any constructive educational and intellectual practice that aims to facilitate optimal le建筑工程期刊杂志arning outcomes through interaction between students. Typical 建筑工程期刊杂志examples of these practices may include:合法的合作关系,是可以被定义为任何有建设性的教育和智力的做法都将有助于AIMS通过学生之间的互动,并最终以促进最佳的学习成果为目的的。论文中的典型例子可能包括以下几类:
• the researching and writing of joint projects/writte发表建筑工程论文n works/tutorial papers;http://www.51fabiaowang.com/jzgcqk/
• discussion of general themes and c发表建筑工程论文oncepts;
• interpretation of assessment criteria;
• informal study/discussion groups;
• strengthening and dev建筑工程师职称论文发表elopment of academic writing skill建筑工程师职称论文发表s through peer assistance;
Legitimate co-operation is based on the principle that producing the work remains the independent responsibility of the student (or group of students where a joint project is undertaken), while recognising the educational value of interaction between students.合法经营的原则是,保持学生生产工作的的独立责任(或一组学生加入其中进行的项目)的基础上,同时承认学生之间的互动的教育价值。
The School of Civil Engineering Statement on Academic Honesty is available from the Civil Engineering Website:
 
Academic Honesty Declaration学术诚信宣言
By submitting this report electronically I am confirming that my assignment meets the academic honesty requirements提交本报告的电子版本,我的任务是确认是否符合学术诚信要求。
•         This assessment is my own work
•         I understand the requirements for academic honesty
•         I am aware of plagiarism and its penalties
•         I have not re-used previously submitted material in this assignment
•         I have not engaged someone else to complete this assignment
•         I have retained a duplicate hard copy of this assignment
Quality assurance Declaration质量保证声明
•         I have proof read my report
•         I have spell checked my report
•         I have read the notes on writing a report. Report Tips  and  Report Rules
 
Introduction介绍
There are two different head losses when water flow though a pipe. One is static head loss, which is caused by elevation.
当水流量通过一个管道时,有出现两种不同的头损失。一个是静态的水头损失,这是因为海拔高度造成的。
The other one is dynamic head loss, since water will lose potential energy due to the friction between pipe and water. It is a potential energy lost, instead of dynamic energy lost, since the flow rate is identical alone the pipe. There are basically two different types of flow, laminar flow and turbulent flow, which can be determined by Reynold’s number. 另一种是动态的水头损失,因为水会失去由于管和水之间的摩擦的势能。这是一个潜在的能量损失,INSTEAD的动态能量损失,由于流率是相同的,仅在管道。基本上有两种不同类型的流量,层流和湍流,从而可以通过以下的数据来确定雷诺数。
As McKEON AND SHARMA (2010) pointed out, ‘The accurate descriptions of statistical scaling and instantaneous structural coherence of turbulent fluctuations, and their relationship to the mean flow, are amongst the important unsolved problems in physics. Even at the simplest level, we still lack a complete explanation of the development of the mean velocity profile in canonical flows as the Reynold’s number increases.’ 
The first part of the experiment was done to found out the relationships between static head loss and elevation. The second part of the experiment was also done to find out the roughness, represented as friction factor, of a smooth pipe in both laminar flow and turbulent flow. The experiment results were compared with theoretical values. Exact values were hard to be predicted when Reynold’s number is large during the dynamic head loss test.实验结果与理论值进行了比较。但是其中的精确值,也就是当雷诺数下降的宽动态水头损失的试验则是很难进行预测。
 
Methods方法
Static head loss test and dynamic head loss test were done in this experiment.
 
Static Head Loss Test:静态总损耗测试
The flow started at a high flow rate. The free jet, P, at each tapping was measured (Image 1). The pipe was titled and the free jet P’ at each tap was measured again. The height of each tap above the horizontal, Z, was also measured (Image 2). 
 
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