Question

5.14 an naca 4415 airfoil is mounted in a high-speed subsonic wind tunnel. the lift coefficient is measured as 0.85. if the test section mach number is 07, at what angle of am airfoil?

Answer 1

if the test section Mach number is 07, at 206.569 m/s angle of am airfoil.

What is test section?
The test section is the portion of a test where students are asked to demonstrate their knowledge or skills. This may include answering questions, writing essays, or completing tasks. The test section is usually timed and may be graded. In a test section, students are asked to answer questions about what they have read. The questions are designed to check how well the students understand the material.

Calculate the lift coefficient at low velocity

$\begin{aligned}c_{l} &=\frac{c_{b_{0}}}{\sqrt{1-M_{\infty}^{2}}} \\c_{b_{0}} &=c_{l} \sqrt{1-M_{\infty}^{2}} \\&=0.85 \sqrt{1-0.7^{2}} \\&=0.607\end{aligned}$

For, the lift coefficient, the corresponding angle of attack is,
α=2°

Calculate the velocity.
$\begin{aligned}V &=c \times c_{b} \\&=340.3 \times 0.607 \\&=206.569 \mathrm{~m} / \mathrm{s}\end{aligned}$

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