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首页> 外文会议>First Joint Conference IAHR-IWA on Pumps, Electromechanical Devices and Systems Applied to Urban Water Management Vol.2; 2003; Polytechnic University of Valencia Spain >Reviewing air valves selection
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Reviewing air valves selection

机译：审查空气阀的选择

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In this paper boundary conditions for the most critical function of air valves (the outlet air phase) are reviewed. The isothermal behavior, proposed by the standard books, of the trapped air into the pipe is compared with the adiabatic process, a more realistic approach for fast transients. It is realized that the unfavorable hypothesis (the adiabatic one) is not used in practice. This is because the pressure of the water hammer due to the chock of the water- column against the dead end of the pipe (higher in the adiabatic analysis) exceeds the maximum peak of pressure reached by the air trapped (bigger under the isothermal hypothesis). With the size of the air valve, the water hammer increases whereas the maximum pressure of the air decreases. The final selection will look for the most favorable combination, a compromise between both effects. Then, in order to select the appropriate air valve,a correct analysis of the transient with the appropriate hypothesis should be performed.
机译：在本文中，对空气阀最关键功能（出口空气相）的边界条件进行了回顾。标准书籍提出的将滞留在管道中的空气的等温行为与绝热过程进行了比较，绝热过程是一种更现实的快速瞬变方法。已经认识到，在实践中没有使用不利的假设（绝热的假设）。这是因为，由于水柱的堵塞而使水锤紧贴在管道的死角上（绝热分析中的压力更高），其压力超过了被捕集的空气达到的最大压力峰值（在等温假设下更大） 。随着气阀的尺寸，水锤增加，而空气的最大压力减小。最终选择将寻找最有利的组合，这是两种效果之间的折衷。然后，为了选择适当的空气阀，应使用适当的假设对瞬态进行正确的分析。

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