结果表明，主要相似准数为雷诺数（动力相似准数）。
The results show that the principal similarity criterion is Reynolds(criterion of dynamic similarity).
提出相似理论的概念、相似准则及采用的相似准数，并进行量纲因次分析。
Put forward the similar theory concept, the similar principle and the similar principle number adopted, and make the dimensional analysis.
主要介绍机械密封设计和使用的实践中用的相似准数。 着重讨论最常用的相似准数，对有些相似准数有各种不同的看法和概念不清之处进行讨论。
The similar criteria for design and application of mechanical seals were presented, the common criteria were discussed, some different viewpoints and concepts of some criteria were discussed.
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