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Tresset [83]
4 years ago
8

Consider two flat plate airfoils as lumped "lifting elements" in a tandem arrangement, where the second airfoil is located at so

me distance downstream from the first airfoil. The chords and attack angles of both airfoils are the same. Find the circulations of these airfoils in terms of the free-stream velocity U , attack angle  , chord c , and the distance between the airfoils’ leading edges d . Which airfoil generates higher lift force and why? Discuss the effect of the distance between the airfoils on their aerodynamic interaction.

Engineering
1 answer:
timurjin [86]4 years ago
7 0

Answer:

Explanation:

Attached is the solution

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A is the answer for the sentence
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25 gallons of an incompressible liquid exert a force of 70 lbf at the earth’s surface. What force in lbf would 6 gallons of this
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Answer:

froce by 6 gallon liquid on moon surface is  2.86 lbf

Explanation:

given data:

at earth surface

volume of an incompressible liquid = Ve = 25 gallons

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on moon

volume of  liquid = Vm = 6 gallons

gravitational acceleration on moon is am = 5.51 ft/s2

Due to incompressibility , the density remain constant.

mass of liquid on surface of earth= \frac{ force}{ acceleration}

mass = \frac{70lbf}{32.2 ft/s2}

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density \rho = \frac{mass}{volume}

                  = \frac{2.173}{25} = 0.0869 pound/ gallon

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Fm = mass * acceleration

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Compute the volume percent of graphite, VGr, in a 3.1 wt% C cast iron, assuming that all the carbon exists as the graphite phase
Arte-miy333 [17]

Answer:

The volume percent of graphite is 9.9%

Explanation:

Given;

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density of graphite, \rho _g = 2.3 g/cm³

Determine the mass fraction;

W_f = \frac{C_g - C_0}{C_g -C_f} \\\\W_f =\frac{100 - 3.1}{100-0}\\\\W_f = 0.969\\\\\\W_g = \frac{C_0 - C_a}{C_g -C_f} \\\\W_g =\frac{3.1-0}{100-0}\\\\W_g = 0.031

Determine the volume fraction;

V = \frac{W_g/ \rho_g}{W_f / \rho_f \ + \ W_g / \rho_g} *100 \%\\\\V = \frac{0.031/ 2.3}{0.969 / 7.9 \ + 0.031 / 2.3}*100\%\\\\V = 9.9\%

Therefore, the volume percent of graphite is 9.9%

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3 years ago
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