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消防通风管道阻力平衡设计注意事项

发布人:   发布时间:2018-06-06 18:25:59

一、关键词的定义

First, the definition of key words

节点的编号规则.为了能根据各节点间的逻辑关系,方便地查寻风道系统的各个环路,大家给各个节点一个数字编号,并对节点编号作如下假定:按风量递减方向对节点从小到大编号,或都说对于送风系统则节点编号沿气流方向递增.

In order to find the various loops of the duct system conveniently according to the logical relationship between the nodes, we numbered each node, and the number of the nodes is assumed as follows: the node number is numbered to the node according to the decreasing direction of the air volume, or the node number of the air supply system increases along the air flow direction.

二、通风管道系统各环路的自动排序

Two, the automatic sorting of each loop of the ventilation pipe system

通风管道系统各环路的自动排序是实现阻力平衡自动计算的前提,也是本程序的关键步骤之一.其过程实际上就是按照各环路的阻力损失大小进行自动排序的过程.通过排序可以较好的解决如下两个问题:①可以根据排序结果直接选取系统的较不利环路;②确实减少各环路阻力平衡时的重复计算.

The automatic sorting of each loop of the ventilation pipe system is the precondition for the automatic calculation of the resistance balance and one of the key steps of the program. The process is in fact the process of sorting automatically according to the resistance loss of each loop. By sorting, the following two problems can be solved well: 1. It can be selected directly according to the ranking results. Take the most adverse loop of the system; second, reduce the repeated calculation of the resistance balance of each loop.

系统各环路的自动排序的具体实行步骤如下:①自动选取末端节点;②依次搜索每一个末端节点对应的环路路径并同步计算 其阻力损失值;③按阻力损失值从大到小对所有环路进行排列.

QQ截图20170428145417.png

The specific implementation steps of the automatic sequencing of each loop are as follows: (1) the terminal node is selected automatically; secondly, the loop path corresponding to each end node is searched in turn and the resistance loss value is calculated synchronously; 3. All loops are arranged according to the resistance loss value from large to small.

三、各环路的阻力平衡

Three, the balance of resistance in each loop

阻力平衡是整个风管设计过程中较烦琐,也是较关键的一步.在此采用按环路阻力值从大到小的顺序依次对各环路进行平衡,并对业已进过平衡的管段不再进行调整,可较好的解决平衡过程中的重复计算问题.为了便于计算,大家假设风管支路中需调整的各管段其调整前后阻力值比例保持不变,而调整前后管径与阻力值之间的关系为:

The resistance balance is the most tedious and the most important step in the design of the whole wind pipe. In this order, the loop is balanced by the order of the drag value of the loop from large to small, and the pipe section which has already entered the balance is no longer adjusted, which can better solve the repeated calculation problem in the balance process. In order to facilitate the calculation, we assume that The ratio of resistance values before and after adjustment in the duct branch is constant, and the relationship between the diameter and resistance value before and after adjustment is:

d=d(p/p)0.225.d:阻力平衡前后风管支路的管径;p、p:阻力平衡前后较不利环路上对应风管支路的阻力值.

D=d (p/p) 0.225.d: the diameter of the branch of the duct before and after the resistance balance; the resistance value of the corresponding wind pipe branch on the most unfavorable loop before and after P and p: resistance balance.

阻力平衡自动计算时,将环路中已经调整的管段路径及阻力损失值除去,并对未经调整的支路按式中对各管段计算出经阻力平衡后的管径d,由d计算出对应的速度v及管段阻力δp.

When the resistance balance is automatically calculated, the adjusted pipe path and the resistance loss value in the loop are removed, and the pipe diameter d after the resistance balance is calculated in the unadjusted branch press, and the corresponding velocity V and the pipe resistance delta P. are calculated by D.

相信看了本文的山东通风管道先容后,对这方面也会有自己的一番认识,以后针对的等问题也能很好的解决。

I believe that this article, after the introduction of the Shandong ventilation pipeline , will also have their own understanding of this aspect, and the following problems can be well solved.


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