Clark Y-14 Wing Performance: Deployment of High-lift Devices (Flaps and Slats)
Source: David Guo, College of Engineering, Technology, and Aeronautics (CETA), Southern New Hampshire University (SNHU), Manchester, New Hampshire
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- For this procedure, use an aerodynamics wind tunnel with a test section of 1 ft x 1 ft and a maximum operating airspeed of 140 mph. The wind tunnel must be equipped with a data acquisition system (able to measure angle of attack, normal force, axial force and pitching moment) and a sting balance.
- Open the test section, and install the wing on the sting balance. Start with clean wing configuration.
- Place a handheld inclinometer on the sting balance, and adjust the pitch angle adjustment knob to set the sting balance pitch to horizontal.
- With the sting balance horizontal, tare the angle of attack (it is called pitch angle in the wind tunnel computer data display panel).
- Tare all force, moment and airspeed readings at zero angle of attack.
- Adjust the angle of attack to -8°, and collect no wind measurements by recording all normal force, axial force and pitching moment readings.
- Repeat the no-wind measurements for pitch angles ranging from -8° to 18°, with 2° increments.
- Return the angle of attack to -8°, and run the wind tunnel at 60 mph. Collect readings of the normal force, axial force and pitching moment from -8° to 18° with 2° increments.
- Adjust the wing to the second configuration with the slat adjusted to have about 3/8 in slot. Repeat steps 3 - 8.
- Adjust the wing to the third configuration, with the flap set to 45° with respect to the chord line, and the slat not deployed. Repeat steps 3 - 8.
- Adjust the wing to the fourth configuration with both the slat and flap deployed (Figure 5). Repeat steps 3 - 8.
The wing is the primary lift-generating apparatus in an airplane, and its geometry is key to its performance. First, recall that lift is an aerodynamic force that is generated by a pressure differential between the top and bottom surfaces. The total lift is proportional to the surface area of the wing. Thus, a higher surface area results in increased lift.
Lift is also affected by the geometry of the wing cross section, called an airfoil. Recall that the chord line of the airfoil connects the leading and trailing edges. Another property called the camber describes the asymmetry between the two surfaces. The majority of wings have positive camber, meaning that they are convex. As with surface area, increased camber results in increased lift.
Since wind speed is relatively slow during takeoff and landing, surface area and camber are increased by deploying devices on the wing's leading and trailing edges in order to generate sufficient lift. The device at the leading edge of the airfoil is called a slat, while the device at the trailing edge is called a flap. Slats and flaps can move into or out of the wings as needed.
While the deployment of slats and flaps increases lift, it also increases the drag force on the aircraft, which acts in opposition to lift. We can quantify both of these forces by calculating the lift coefficient and drag coefficient as shown, where L and D are lift and drag, respectively. Rho infinity and V infinity are the free stream density and velocity, while S is the reference area of the wing.
Lift, as a distributive force in nature, can be equalized or simplified into a single concentrated force located at the center of pressure. However, as the angle of attack changes, this location moves forward or aft. So instead, we refer to the aerodynamic center of the wing when discussing forces.
The aerodynamic center of the wing is the location where the pitching moment coefficient is effectively unchanged by varied angle of attack. Another typical way to express pitching moment is to use the pitching moment coefficient. This dimensionless coefficient is calculated as shown, where M C/4 is the pitching moment about the 1/4 chord point.
In our demonstration, we measure the pitching moment at a 1/4 chord, which is close to the aerodynamic center of the wing. In this experiment, we will study a Clark Y-14 airfoil with a simple flat and slat at various angles of attack. We will then analyze lift, drag, and pitching moment to determine performance characteristics at each configuration.
For this experiment, use an aerodynamic wind tunnel with a 1 ft by 1 ft test section and a maximum operating airspeed of 140 mph. The wind tunnel must be equipped with a data acquisition system and a sting balance, which measures both normal and axial forces.
Now, obtain a Clark Y-14 wing model with an attached flap and slat. Begin the test with the clean wing configuration, meaning that neither the flap nor slat are deployed. Now open the test section, and install the wing on the sting balance.
Operate the pitch angle adjustment knob underneath the test section of the wind tunnel to adjust the sting balance pitch to horizontal. Use a handheld inclinometer to measure the pitch angle and adjust the pitch to reach a reading of zero. Close the test section and tare the pitch angle in the wind tunnel display. Then, tare all force, moment, and airspeed readings on the data acquisition system.
Now, adjust the pitch angle, also called the angle of attack, to minus 8?, and make a no-wind measurement by recording all axial force, normal force, and pitching moment readings. Repeat the no-wind measurements for pitch angles ranging from minus 8 to 18? with 2? increments. When all of the no-wind measurements have been made, return the pitch angle to minus 8?.
Now, turn on the wind tunnel and increase the airspeed to 60 mph. Take readings of the axial force, normal force, and pitching moment for pitch angles ranging from minus 8? to 18?, with 2? increments. After you have completed all of the measurements with the clean wing, turn the wind tunnel off and open the test section.
Adjust the wing to a new configuration, with the slat adjusted to have about 3/8 of an inch of slot. Rerun the experiment exactly the same way as for the clean wing, by first making no-wind measurements at minus 8 - 18? pitch angles with 2? increments. Then collect the same measurements at 60 mph.
After you have completed these measurements, modify the wing to a third configuration with the flaps set to 45? with respect to the chord line and the slat not deployed. Then rerun the measurements as before. Finally, adjust the wing to the fourth configuration, where both the slat and flap are deployed, and repeat the experiment.
Now let's interpret the results. To analyze the data, we'll first calculate the non-dimensional lift coefficient at each pitch angle, which is defined as shown. Rho infinity is the free stream density, V infinity is the free stream velocity, and S is the reference area of the wing. All of these values are known.
Lift, L, is calculated as a relation of two force pairs, where N is the normal force and A is the axial force. Both were measured by the sting balance. Alpha is the angle of attack, also called the pitch angle, in this experiment. Now, let's look at a plot of the lift coefficient versus the pitch angle for each of the four configurations.
Comparing the clean wing and the slat configuration curves, we see that the two curves are almost overlapping at low angles of attack. However, the clean wing lift curve peaks at about 12?, but the slat curve continues to increase. This indicates that a slat can be used to increase lift. If we compare the clean wing and the flap lift curves, we see that the flap increases lift over the entire angle of attack range.If both the slat and flap are deployed at the same time, the benefit of both devices are combined and the maximum lift is even higher.
Next, calculate the drag coefficient for each angle, which is defined as shown. Drag, D, is also defined as a relation of the normal and axial force pairs. In comparing the drag coefficient for each configuration, we see that the drag increases dramatically with the flap and slat deployed. The resultant aerodynamic force, R, from drag and lift is located on a point on the wing called the center of pressure.
The center of pressure is not a fixed location, but instead moves with changing angle of attack. Thus, it is more convenient to calculate all forces and moments about the 1/4 chord point. Then, using the pitching moment at 1/4 chord, which is measured by the sting balance, we can calculate the pitching moment coefficient as shown.
Finally, looking at the pitching moment coefficient for each configuration and pitch angle, we see that the pitching moment coefficient goes into the negative regime with the flap deployed. This means that the center of pressure shifts towards the trailing edge with the flap deployed.
In summary, we learned how lift-generating apparatus are used to improve aircraft performance. We then evaluated a Clark Y-14 wing in a wind tunnel to see how a flap and a slat affects lift, drag, and pitching moment.
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Q1: How do slats and flaps increase lift during takeoff and landing?
Slats at the leading edge and flaps at the trailing edge increase wing surface area and camber, both of which enhance lift generation. Since wind speed is relatively slow during takeoff and landing, these high-lift devices deploy to generate sufficient lift. However, they also increase drag, which must be managed during flight operations.
Q2: What is the relationship between wing geometry and aerodynamic performance?
Wing performance depends on surface area, airfoil shape, and camber. Lift is proportional to surface area, and increased camber results in increased lift. The airfoil's chord line connects the leading and trailing edges, while camber describes asymmetry between surfaces. These geometric properties directly determine how much lift a wing generates at different angles of attack.
Q3: Why does the center of pressure move with changing angle of attack?
The center of pressure is the point where the resultant aerodynamic force from drag and lift acts. Since this location shifts with changing angle of attack, it is more convenient to calculate forces and moments about the 1/4 chord point, which is near the aerodynamic center. The aerodynamic center is where the pitching moment coefficient remains effectively unchanged by varied angle of attack.
Q4: How are lift and drag coefficients calculated in wind tunnel testing?
Lift and drag coefficients are dimensionless values calculated using measured forces, free stream density and velocity, and wing reference area. A sting balance in the wind tunnel measures normal and axial forces, which are then used to compute these coefficients. These calculations allow comparison of aerodynamic performance across different wing configurations and angles of attack.
Q5: What happens to aerodynamic performance when both slats and flaps are deployed?
Deploying both slats and flaps simultaneously combines the benefits of each device, resulting in even higher maximum lift than either device alone. However, this configuration also increases drag significantly. The pitching moment coefficient becomes more negative with flap deployment, indicating the center of pressure shifts toward the trailing edge.
Q6: How does a slat affect the lift curve compared to a clean wing?
A slat allows the lift curve to continue increasing beyond the angle where a clean wing stalls. While both configurations show similar lift at low angles of attack, the clean wing peaks around 12 degrees, but the slat configuration continues to generate additional lift at higher angles. This extended lift range makes slats valuable for safe takeoff and landing operations.
Q7: What role does the sting balance play in measuring wing performance?
The sting balance is a critical instrument that measures both normal and axial forces acting on the wing model during wind tunnel testing. These force measurements are used to calculate lift and drag coefficients, as well as pitching moment about the 1/4 chord point. Accurate force data enables engineers to evaluate how different wing configurations perform at various angles of attack.