A Wind tunnel laboratory is located atop a mountain which is 10,000 ft above sea
ID: 1023200 • Letter: A
Question
A Wind tunnel laboratory is located atop a mountain which is 10,000 ft above sea level on a standard day. A manometer is connected to a static pressure port in a wind tunnel lest section on one side and open to the atmosphere on the other side of the manometer. The manometer is filled with water and the height difference of the water in the manometer is 8 inches. The temperature is 23 degree F. Which static pressure should be lower? Inside or Outside? Why? What is the pressure inside of the test section in inHg? What would the outside pressure be if the density altitude was 12,000ft and the temperature remained the same? Would it be a standard day?Explanation / Answer
a.
according to the equation of continuity p1v1A1 = p2v2A2
since air is the same which has p1=p2 =p(inside and outside)
since area is small there pressure should be higher inside
b.
found out the air pressure at altitude 10000 ft = 67688.36 Pa(source:http://www.mide.com/pages/air-pressure-at-altitude-calculator)
pressure inside the test section is = 67688.36 - 8*0.2032*1000*9.776 = 51796.49 pa =388.50565 mm of hg
c.
found out the air pressure at altitude 12000 ft = 62201.36 Pa(source:http://www.mide.com/pages/air-pressure-at-altitude-calculator)
no this is not a standard day as 101325- hpg =101.325 - 3657.6*1.225*9.768 = 57588.8899 Pa(should be this much)
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