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á÷á?2aá??úá÷×°??ó??×°??￠??×ìoí???eà?1ü

2aá?3??ú?21üμ?á÷ì?á÷á?

GB/T2624?a93

′úì?GB2624-81

Measurementoffluidfluwbymeansoforificeplates￡?

nozzlesandVenturitubesinsertedincircular

cross-sectionconduitsronningfull

1993-02-02·￠2?1993-08-01êμê?

1ú?ò??ê??à????·￠2?

±?±ê×?μèD§2éó?1ú?ê±ê×?ISO5167-1(1991)??ó?2??1×°??2aá?á÷á?μúò?2?·?￡o°2×°

?ú3??úá÷ì?μ??2D?????1üμà?Dμ??×°??￠??×ìoí???eà?1ü?·?￡

1?÷ìa?úèYó?êêó?·??§

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2?è·?¨?èμè·???μ?±?Dè×êá??￡

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1y2aá???μ?á÷?ˉ±?D?ê?±￡3???ò??ùμ??￠?è?¨μ??ò????ê±???o?y±??ˉμ?￡?á÷ì?±?D?ê?μ￥?àá÷

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3.2.1?úá÷×°??throttlingdevice

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3.2.2?úá÷?tthrottlinge1ement

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3.2.3±ê×??úá÷?tstandardthrottlingelement

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3??×°??￠??×ì?￠???eà?1ü)μè?￡

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??′1?±￡???±??μê?è?à?μ?￡??×°?o?ó??×°??±???à±èê?±è??D?μ??￡

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3.2.7???eà?1üVenturitube

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3.2.8?±??±èdiameterratio

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3.2.102??1differentialpressure

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3..2.11?1á|±èpressureratio

??ó?1ü±úè??1?ú′|μ??????2?1ó?é?ó?1ü±úè??1?ú′|μ??????2?1??±è?￡

3.2.12à×?μêyReynoldsnumber

±í?÷á÷ì?1?D?á|ó??3D?á|??±èμ??Tá??ù2?êy?￡±?±ê×??ùó?μ?à×?μêy?éò?ê?ò?á÷ì?é?ó?

ì??t2?êyoíé?ó?1üμà?±???ù±íê?μ?à×?μêy￡?è?1?ê?(1)?￡ò2?éò?ê?ò?á÷ì?é?ó?ì??t2?êyoí?ú

á÷?tμ??úá÷?×?±???òoí2??±???ù±íê?μ?à×?μêy￡?è?1?ê?(2)?￡

D

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R

1

m

1

1

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=

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β

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Re

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3.2.14á÷3??μêydisdichargecoefficient

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2

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4

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2

4

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1

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3.2.16′?2ú?è???è2?êyroughnesscriterion

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?ú?úá÷?t?°oó2úéúμ?2??1ò2óú′ó￡??ùò??éí¨1y2aá?2??1à′oaá?á÷ì?á÷1y?úá÷×°??ê±μ?á÷á?

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òà?′·?쨱?±ê×?μ?òa?ó￡??ò?ú±?±ê×??ù1??¨μ?2?è·?¨?è???ú￡??êá?á÷á?ó?2??1μ?1??μóé1?

ê?(6)è·?¨￡??ò??óé1?ê?(7)è·?¨?￡ì??yá÷á?ó?2??1μ?1??μóé1?ê?(9)è·?¨?￡

1

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4.3.2|¤P?a3.2.10?ù?¨ò?μ?2??1?￡

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4.3.4????á÷á?ê±±?D??aμà?ú1¤×÷ì??t??μ?á÷ì??ü?èoí?3?è?￡

4.4?ü?èμ?è·?¨

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4.4.1á÷ì?μ??2?1ó|?úé?ó??ò??ó?è??1?ú????′|2aμ??￡

4.4.1.1ò?°??é????￡??2?1è??1?úó?ó?à′2aá?2??1μ?é?ó??ò??ó?è??1?ú·??a?￡3y·?Dèòa·?

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1ü±ú′|2aμ?μ??1á|?μ2?í??￡

4.4.2á÷ì????è×?o??ú?úá÷?t??ó?2aμ?￡??????è??2??×?òì×1üó|??óD???é?üD?μ??????￡è?

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