我的水头200米、、管长1000米、、流量0.2立方秒、、要多大管径
\u6c34\u5934\u9ad850\u7c73\uff0c\u7ba1\u5f84200mm\uff0c\u80fd\u4e0d\u80fd\u8ba1\u7b97\u51fa\u6d41\u91cf\uff1fmgh=1/2mv^2 v^2=2gh=2x10x50=1000 v=31.6m/s
\u7406\u8bba\u4e0a\u7ba1\u53e3\u672b\u7aef\u7684\u6c34\u6d41\u901f\u5ea6\u662f31.6\u7c73
\u7ba1\u5b50\u9762\u79ef A=3.14x0.1x0.1=0.03m^2
\u6d41\u91cf 31.6x0.03=0.948\u7acb\u7c73/\u79d2
\u7eaf\u7cb9\u7684\u7406\u8bba\u8ba1\u7b97.\u5b9e\u9645\u4e0a\u80fd\u5c0f\u4e00\u4e9b
\u6d41\u91cf Q=200\u7acb\u65b9\u7c73/\u5c0f\u65f6=0.0556\u7acb\u65b9\u7c73/\u79d2\uff0c
\u4e3a\u4f7f\u7ba1\u8def\u538b\u529b\u635f\u5931\u4e0d\u81f4\u592a\u5927\uff0c\u8003\u8651\u7ba1\u5185\u6d41\u901f\u53d6V=1.5\u7c73/\u79d2\uff0c\u5219\u7ba1\u5185\u5f84
D={4Q/(3.14V)}^(1/2)=={4*0.0556/(3.14*1.5}^(1/2)=0.217\u7c73\uff0c\u53d6D=200mm,\u5373\u91c7\u7528DN200mm\u7ba1\u9053\uff0c\u5176\u6bd4\u963b\u4e3a9.029\u3002\u7ba1\u7ebf\u957f\u7ea6200\u7c73\uff0c\u538b\u529b\u635f\u5931\u4e3a
P=pgSLQ^2=1000*9.8*9.029*200*0.0556^2= 54707 Pa =0.558\u516c\u65a4/\u5e73\u65b9\u5398\u7c73
\u8981\u6c42\u7ba1\u9053\u8d77\u7aef\u538b\u529b\u4e3a\uff1a6+0.558 = 6.558 \u516c\u65a4/\u5e73\u65b9\u5398\u7c73
采用DN200-DN250的钢管可以
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