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重力流输水系统全线开阀模拟工况出现负压

①全线开阀模拟,按照先关后开900-600-600s的规律同时开阀,在ST-10附近管段出现负压。且ST-10出水量为0.75个流量,麻烦老师帮忙看看模型哪里出问题了

②支线爆管工况和各支线依次关阀工况、依次开阀工况可以模拟吗,具体怎么操作?

③达到设计流量时,怎么确定阀门相应的开度?2021.10.9开阀工况.rar