The present automatic transformation mainly concentrates on attempt and the exploration in control method of dryness fraction of steam.

目前的注汽锅炉自动化改造主要就集中在对蒸汽干度控制方法的尝试和探索上。

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Steam thermal drive oil is the method in which high pressure steam with suitable dryness fraction is injected into heavy oil stratum.

注蒸汽稠油热采是指稠油开采时向稠油层注入适当干度的高压蒸汽进行原油采集。

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The change of sound velocity with pressure, dryness degree, void-fraction, and phase-transition coefficient are analyzed. Some important conclusions are derived.

分析了两相流体中音速随压力、干度、汽隙率、相变系数等的变化关系，并从中得出了一些重要的结论。

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