流量测量装置中各种管网歧管开口的高压损失(水头损失)建模

Djoni Irianto
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引用次数: 0

摘要

水流通过管道时的水头损失往往与我们假设的情况不同,即发生不可压缩的流动。然而,这种假设并不总是正确的,因为管道内的流动模式是不可见的,只能通过精密仪器进行测量。管道内是否有水只能在清晰的范围内进行测试,尤其是当管道是多层建筑内管网的一部分时。由于长度、直径和弯曲度的不同,确定建筑物内的管网需求并非易事。水力专家往往会忽略这些差异,而当水流过程中发生堵塞时,这些差异就会成为问题。为了找到解决这一问题的办法,有必要使用一种名为水测量装置的设备进行测试。这在实验室中很少见。使用该装置测试水压需要各种仪器和各种阀门开口,并由一定容量的水泵提供加压水。为了分析不同阀门开度测试所产生的流量,研究人员从 0.5、0.75、1.00 等开度开始,测试并测量每个开度的流量容量。他们读取仪器,将铜从一个高度移到另一个高度,并以对接头的形式绘制出测试结果图。研究人员对装置及其开口进行测试,每个开口测试三次,在测量仪器上记录并绘制压力值和所需时间。随后,建议压力测试结果(水头损失)向水管安装规划人员提供信息,即在一定条件下,各种阀门开度的测试结果具有不同的压力值和行程时间。事实证明,在放置软管或 2 号铜管时,可以观察到压力的稳定性,压差没有明显增加。在使用软管或 2 号铜管的实验中,可以说一切都很稳定,足以得出没有水头损失的结论,建议安全建模。
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Modeling of High Pressure Loss (Head Loss) in a Flow Measurement Unit with Various Pipe Network Manifold Openings
The head loss in water flowing through pipes often turns out to be different from what we assume, which is the occurrence of incompressible flow. However, this assumption is not always true because the flow pattern inside the pipe is not visible and can only be measured with precise equipment. The presence of water in the pipes can only be tested on a clear scale, especially when it is part of the network within a multi-story building. Determining the need for a pipe network within a building is not an easy calculation due to differences in length, diameter, and bends. Hydraulic experts often overlook these differences, which can become a problem when clogs occur during the flow process. To find a solution to this problem, it is necessary to conduct tests using a device called a Water Measurement Unit. This is rarely done in laboratories. Testing the water pressure with this device requires various instruments and a variety of valve openings supplied with pressurized water by a pump at a certain capacity. To analyze the flow rates resulting from the tests with different valve openings, researchers test and measure the flow rate capacity for each opening, starting with openings of 0.5, 0.75, 1.00, and so on. They read the instrument, move the copper from one height to another, and create a graph of the test results in the form of a pair of connectors. The researchers test the device and its openings three times for each opening, recording and mapping the pressure values and the time it takes on the measuring instrument. Subsequently, the results of the pressure test (Head Loss) are recommended to provide information to water pipe installation planners that the test results with various valve openings under certain conditions have different pressure values and travel times. It turns out that in the placement of hose or copper number 2, stability is observed with pressure, and there is no significant differential pressure increase. In the experiment with hose or copper number 2, it can be said that everything is stable enough to conclude that there is no head loss, and it is recommended to be safe for modeling.
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