The formula to calculate the Drag Force Percent (DFP) is:
\[ DFP = \left( \frac{DF_{reduced}}{DF_{original}} \right) \times 100 \]
Where:
Drag force percent is a measure of the effectiveness of drag reduction techniques. It compares the drag force experienced by an object with and without drag reduction measures. This percentage helps in understanding how much the drag force has been reduced due to the implementation of these techniques. A lower drag force percent indicates a more effective drag reduction.
Let's say the drag force with reduction (DFreduced) is 50 N, and the drag force without reduction (DForiginal) is 100 N. Using the formula:
\[ DFP = \left( \frac{50}{100} \right) \times 100 = 50 \% \]
So, the drag force percent (DFP) is 50%.
Formula: \( F_d = \frac{1}{2} \rho v^2 C_d A \)
Example: \( F_d = \frac{1}{2} \times 1.225 \times 30^2 \times 0.47 \times 2 \)
Formula: \( \text{Ratio} = \frac{F_{d1}}{F_{d2}} \)
Example: \( \text{Ratio} = \frac{500}{250} \)
Formula: \( \text{Average Drag Force} = \frac{\sum F_d}{n} \)
Example: \( \text{Average Drag Force} = \frac{1000}{5} \)
Formula: \( \text{Total Drag Force} = \sum F_d \)
Example: \( \text{Total Drag Force} = 200 + 300 + 500 \)
