103年 - 103 淡江大學轉學考流體力學#55729

科目：研究所、轉學考(插大)-流體力學 | 年份：103年 | 選擇題數：0 | 申論題數：7

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所屬科目：研究所、轉學考(插大)-流體力學

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申論題 (7)

【已刪除】1. (20) A Pitot-static probe connected to a water manometer is used to measure the velocity of air. If the deflection (the vertical distance between the fluid levels in the two arms) is 7.3 cm, determine the air velocity. (Take the density of air to be 1.25 kg/rn³.)

【已刪除】2. (20) A 5-cm-diameter horizontal jet of water a velocity of 30 m/s relative to the ground strikes a flat plate that is moving in the same direction as the jet at the velocity 10 m/s. The water splatters in all directions in the plane of the plate. How much force does the water stream exert on the plate?

【已刪除】3. (20) The drag characteristics of a blimp{小型軟式飛艇)5 m in diameter and 60 m long are to be stijdjed in wind tMpne). |f the spe^cl of the blimp through still air is 10 m/s, and if a 1/10 scale model is to be tested, what airspeed in the wind tunnel is needed for dynamically similar conditions? Assume the same air pressure and temperature for both model and prototype.

【已刪除】4. (10) A hydraulic jack has the dimensions shown. If one exerts a force F of 100 N on the handle of the jack, what load, F₂/ can the jack support? Neglect lifter weight.

【已刪除】5. (15) What is the pressure of the air in the tank if L₁=40 cm, L₂=100 cm, and L₃= 80 cm? (Density of water=1000 kg/m³, SG_air=0.0013, SG_oii=0.8,SG_mercury=13.6)

(a) Obtain expressions for velocity components u and v,

(b) Verify that the flow field satisfies the incompressible continuity equation.