通風(fēng)管道內(nèi)風(fēng)速及風(fēng)量的測定，是通過測量壓力換算得到的。下面由濟南通風(fēng)管道廠家的操作人員介紹一下
The measurement of wind speed and air volume in ventilation duct is obtained by conversion of measured pressure. The following is introduced by the operators of the ventilation duct manufacturer:
據(jù)了解，要想測得管道中氣體的真實壓力值，除了正確使用測壓儀器外，合理選擇測量斷面、減少氣流的擾動對測量結(jié)果的影響很大。
It is understood that in order to measure the real pressure value of the gas in the pipeline, in addition to the correct use of pressure measuring instruments, reasonable selection of measurement section and reduction of airflow disturbance have great influence on the measurement results.
測量斷面應(yīng)盡量選擇在氣流平穩(wěn)的直管段上。測定動壓時如發(fā)現(xiàn)任何一個測點出現(xiàn)零值或負(fù)值，表明氣流不穩(wěn)定，該斷面不宜作為測定斷面。
The measurement section should be selected on the straight pipe section with stable air flow as far as possible. If zero value or negative value is found at any measuring point during the measurement of dynamic pressure, it indicates that the air flow is unstable, and this section should not be used as the measurement section.
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當(dāng)測量斷面設(shè)在彎頭、三通等異形部件前面(相對氣流流動方向)時，距這些部件的距離應(yīng)大于2倍管道直徑。
When the measuring section is set in front of the elbow, tee and other special-shaped parts (relative to the flow direction of air flow), the distance from these parts should be greater than twice the pipe diameter.
當(dāng)測量斷面設(shè)在彎頭、三通等異形部件后面時，距這些部件的距離應(yīng)大于4～5倍管道直徑。
When the measuring section is set behind the elbow, tee and other special-shaped parts, the distance from these parts should be greater than 4-5 times of the pipe diameter.
當(dāng)測試現(xiàn)場難于滿足要求時，為減少誤差可適當(dāng)增加測點。但是，測量斷面位置距異形部件的較小距離至少是管道直徑的1.5倍。
When the test site is difficult to meet the requirements, in order to reduce the error, the measuring points can be appropriately increased. However, the smaller distance between the measuring section and the abnormal part is at least 1.5 times of the pipe diameter.
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