歐拉運動微分方程各項的單位-資料下載頁
2025-06-24 00:08本頁面
【正文】 y2 = , p1 = p2 , γ=9810 N/m2 , 代入得 解得：v1 = , v2 = To the right15. A diverging nozzle that discharges an 8indiameter water jet into the air is on the right end of a horizontal 6indiameter pipe. If the velocity in the pipe is 12fps, find the magnitude and direction of the resultant axial force the water exerts on the nozzle. Neglect fluid friction. (10分)Solution: to the right16. A horizontal 100mmdiameter pipe (f=) projects into a body of water (ke=) 1m below the surface. Considering all losses, find the pressure at a point 5 m from the end of the pipe if the velocity is 4 m/s and the flow is (a) into the body of water。 (b) out of the body of water. (10分)Solution:(a) (b) 17. A rectangular plate 5 ft by 4 ft is at an angle of 30176。with the horizontal, and the 5ft side is horizontal. Find the magnitude of the force on one side of the plate and the depth of its center of pressure when the top edge is (a) at the water surface。 (b) 1 ft below the water surface. (10分)Solution:(a) (b)18. Water in a reservoir is discharged from a vertical pipe. If a=25 ft, b= 60 ft, c=40 ft, d= 2ft. All the losses of energy are to be ignored when the stream discharging into the air at E has a diameter of 4 in. What are pressure heads at B, C and D, if the diameter of the vertical pipe is 5 in? (10分) 19. A nozzle that discharges a 60mmdiamater water jet into the air is on the right end of a horizontal 120mmdiameter pipe. In the pipe the water has a velocity of 4 m/s and a gage pressure of 400 kPa. Find the magnitude and direction of the resultant axial force the water exerts on the nozzle, and the head loss in the nozzle. (10分)Solution: to the right
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