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重庆阀门厂家为你讲诉木锈钢阀门的作用

发布时间:2019-07-09 来源:

用流体力学表明一下阀门的作用:

With the fluid mechanics to explain the role of the valve:

任何结论都是有条件的。“液流流经差异断面的流量是相称的,有V1*A1=A2*V2的干系”,它的前提条件是流道没有分叉,除管道的起端和未端外,没有流量从流道分出,也没有流量注入流道。譬如,大小直径差别的管道串联,同一股水流从大小管道流过,就有V1*A1=A2*V2。

Any conclusions are qualified. "Liquid flow through the different sections of the flow is equal, aV1*A1=A2*V2 relationship", it is the prerequisite for channel no bifurcation, in addition to the beginningand end of the pipeline, no flow from the runner out, no flow injection flow. For example, pipelinediameter in different series, with a stream of water flowing through the pipeline from the size, have V1*A1=A2*V2.

“阀门将液流断面面积淘汰,那么在此断面的流速增大,流量应该稳固的。”这就不合错误了。诚然,阀门是将液流断面面积A淘汰了,该处的液流流速V也将加大些,流量Q=V*A,右边的两个因数一个减小,一个增大,你怎能鉴定流量是增大了呢?原形上流速的增大增补不了断面面积的减小的影响,流量是要减小的。关小阀门的开度实际上增大了管道的总阻力,在管道首未两端水头差H稳固的前提下,管道的流量是要减小的。设管道的长度为L,管内径为d,沿程阻力系数为λ ,管过流面积为A,阀门处的局部阻力系数为ζ,用连续方程和伯努利能量方程可以推出管道的流量Q: Q=μA√(2gH),式中流量系数 μ = 1/√(1+λ/d+ζ) 阀门开度减小,局部阻力系数为ζ增大,管道的流量系数μ 减小,流量Q虽然也就减小了。注:(但阀门处的流速是有大概比原先大)

"The valve will flow section area is reduced, so in this section of the flow velocity increases, the flow rate should be constant." This is wrong. Indeed, the valve is in the flow cross section area of A reduced, will also increase, the flow velocity of V flow Q=V*A, the right of the two factor a decrease, an increase, how can you determine the flow is increased? In fact the increasing flow of making up the section area decreases,the flow is reduced. Close a small valve opening actually increases the total resistance of pipeline, pipelinewater head difference not ends in H unchanged, pipe flow is reduced. Set the length of the pipe is L, the inner diameter of the pipe is D, friction coefficient for lambda, pipe flow area is A, local resistance coefficient of valve for the zeta, with the continuity equation and the energy equation of Bernoulli can be introduced pipeline flow Q: Q= μ A V (2gH), type of flow coefficient μ = 1/ x (1+ λ /d + ζ) reduces the valve opening, the local resistance coefficient ζ increases, flow coefficient μ pipeline decreases, flow rate Q of course also reduced. Note: (but the valve flow is possible than the original

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