Regarding the problem of hydraulics, please come in and help solve the problem! 50

Total head = gravity head + hydrostatic head + dynamic pressure head, gravity head is related to height, static pressure head is related to pressure, and dynamic pressure head is related to fluid flow rate.

FYI] Exercise] The diameter of the prestressed concrete water pipeline is d=300mm, the length l=500m, and the head loss along the way hf=1m. Xie Cai's formula and Hazen William's formula were used to solve the flow velocity in the pipeline, respectively.

With Xie Cai's formula:

Hydraulic radius r=d 4= , hydraulic slope j=hf l=1 500=roughness n=

Xie Cai's coefficient c=r (1 6) n=

Flow velocity in the pipe v=c(rj) (1 2)=50*(with Hassenwilliam's formula:

By the formula of Haysen William d=(

In hydraulics, the term "water head" is mainly used, and "pressure head" has not been heard of. As an engineering discipline, hydraulics mainly emphasizes its practicality in engineering, which makes it different from traditional physics in the formulation of some problems, such as reflecting the law of conservation of energy.

Bernoulli's equation is written as: pressure head + position head + kinetic head = constant.

All of them are length dimensions.

This may be for the convenience of measurement and drawing. All in all, although the head of water is a measure of length, it reflects the measurement of pressure and energy in hydraulics.

The pressure head is also known as the pressure measurement height. is the pressure p acting on the unit area and the volume weight per unit of fluid.

ratio (p). It can also be understood as the pressure potential energy possessed by water per unit weight with a density of .

PS: Just now, "indenter" is indeed not a concept in the category of hydraulics.

Pure hand-hitting, hope thank you

1.If a small bump is added to the bottom plate of the channel of the water jump, the water depth will increase accordingly. [Wrong, Xiaokan will have an energy dissipation effect].

2.The flow of water is dense, indicating that the speed of the water flow is large or small? [If the density is high, the flow rate is large] 3A long pipeline with pressure is considered to be fully consumed by the head loss along the way. [Yes, there was no local loss in between].

Constant flow, non-constant flow: see if the flow regime everywhere changes with time uniform flow, non-uniform flow: constant flow laminar flow that does not change along the flow in space, turbulent flow:

It indicates the strength of the flow velocity pulsation, which is judged by the Reynolds number. Laminar flow, turbulent flow can be constant flow or unsteady flow.

Total head = gravity head + hydrostatic head + dynamic pressure head, gravity head is related to height, static pressure head is related to pressure, and dynamic pressure head is related to fluid flow rate. FYI] Exercise] The diameter of the prestressed concrete water pipeline is d=300mm, the length l=500m, and the head loss along the way hf=1m. Xie Cai's formula and Hazen William's formula were used to solve the flow velocity in the pipeline, respectively.

Use Xie Cai's formula: hydraulic radius r=d 4= , hydraulic slope j=hf l=1 500= roughness n= xie.

With Xie Cai's formula:

Hydraulic radius r=d 4= , hydraulic slope j=hf l=1 500=roughness n=

Xie Cai's coefficient c=r (1 6) n=

Flow velocity in the pipe v=c(rj) (1 2)=50*(with Hassenwilliam's formula:

By the formula of Haysen William d=(

Obtain: v = take the coefficient c = 100, get v =

Flow rate of drain pipe: Q = A (2gh).

Where: flow coefficient =1 (1+ +l d) (1 2)=1 (1 + overflow area a= d 2 4= *1 2 4 = head h=4m is substituted into the above formula.

Flow rate q= m 3 s

Pipe specific resistance s=

Pipeline flow q=[h (sl)].

Head loss h = p (pg).

The outlet pressure plus the loss of the pipeline plus the flow resistance is the head.