4. A subsonic wind tunnel with an area ratio of 1/5 is operating at standard sea...
4. A subsonic wind tunnel with an area ratio of 1/5 is operating
at standard sea level conditions.
a. If the test section speed is 40 ft/s, what is the pressure
difference between the settling chamber and the test section?
b. If the pressure in the settling chamber is 2000 lb/ft2, what is
the pressure in the test section?
c. The exit of the diffuser has an area that is 7 times the size of
the test section. What is the velocity at the exit of the
diffuser?
d. What is the pressure at the exit of the diffuser?
Homework Answers
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4. A subsonic wind tunnel with an area ratio of 1/5 is operating
at standard sea...
1. Consider a design of a low-speed open-circuit subsonic wind tunnel. The goal is to achieve...
1. Consider a design of a low-speed open-circuit subsonic wind tunnel. The goal is to achieve a free stream velocity of 150 m/s at the test section of this tunnel. This wind tunnel is equipped with a U-tube mercury manometer that measures the pressure difference between the inlet (the settling chamber) and the test section. If the fan of the wind tunnel is able to generate the maximum pressure difference corresponding to a height difference of 10 cm on the...
1. [20 pts] An indraft wind tunnel pulls air into an inlet, through a contraction, the...
1. [20 pts] An indraft wind tunnel pulls air into an inlet, through a contraction, the test section, and the diffuser, as shown below. The test section has a circular cross section and it has a diameter of 0.5 m. Assume the wind tunnel is at sea level and the temperature and pressure of the atmosphere are given by standard atmospheric conditions. (a) If the test section is designed to have a velocity of 200 m/s, determine the Mach number,...
A finite wing area of 1.5 ft2 and aspect ratio of 6 is tested in a...
A finite wing area of 1.5 ft2 and aspect ratio of 6 is tested in a subsonic wind tunnel at a velocity of 180 ft/s at standard sea-level conditions. At an angle of attack of ?1°, the measured lift and drag are 0 and 0.181 lb, respectively. At an angle of attack of 2°, the lift and drag are measured as 5.0 and 0.23 lb, respectively. Calculate the span efficiency factor and the infinite-wing lift slope. (Round the final answers...
The closed-circuit wind tunnel flows air with a velocity of 200 fu's (between sections (5) and...
The closed-circuit wind tunnel flows air with a velocity of 200 fu's (between sections (5) and (6)] at standard condition. The picture and diagram of the wind tunnels are provided below. The flow is driven by a fan that essentially increases the static pressure by the amount Pi-P that is needed to overcome the head losses experienced by the fluid as it flows around the circuit. Determine the pressure rise ( P P ) Conditions) Assume air is incompressible (Mach...
HW#4 (Due 3/14/2019) Problem 1: (10pts) Consider a wing is mounted in a subsonic wind tunnel,...
HW#4 (Due 3/14/2019) Problem 1: (10pts) Consider a wing is mounted in a subsonic wind tunnel, where the airflow velocity is 50 m/s. If the velocity at a point on the wing is 60 m/s, what is the pressure coefficient at this point? Problem 2: (1Opts) In Problem 1, if the test section air temperature is 280 K, and if the flow velocity is increased point? to 200 m/s, what is the pressure coefficient at the same
5. The closed-circuit wind tunnel flows air with a velocity of 200 ft/s [between sections (5)...
5. The closed-circuit wind tunnel flows air with a velocity of 200 ft/s [between sections (5) and (6)] at standard condition. The picture and diagram of the wind tunnels are provided below. The flow is driven by a fan that essentially increases the static pressure by the amount pı - p9 that is needed to overcome the head losses experienced by the fluid as it flows around the circuit. Determine the pressure rise (pi - ps). Conditions) Assume air is...
9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross...
9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume there are no losses in the wind tunnel) Contraction ratio: 7 Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in the test section with a manometer (manometer fluid is water with...
For the air wind tunnel shown Honeycomb Flow Straightener Anti-Turbulence Screens Silencer Fan Diffuser Test Section...
For the air wind tunnel shown Honeycomb Flow Straightener Anti-Turbulence Screens Silencer Fan Diffuser Test Section Inlet Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m?, and absolute viscosity of air is 1.825*10-S Ns/m? (assume there are no losses in the wind tunnel) Contraction ratio: 7 Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in the test section with a...
8) (1 point) Honeycomb Flow Straightener -Anti-Turbulence Screens Silencer Diffuser Fan Test Section Inlet The wind...
8) (1 point) Honeycomb Flow Straightener -Anti-Turbulence Screens Silencer Diffuser Fan Test Section Inlet The wind tunnel shown above is; a) open circuit/suction/low speed wind tunnel b) open circuit/blow-down low speed wind tunnel c) closed circuit/suction/supersonic wind tunnel d) closed circuit/blow-down/supersonic wind tunnel 9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume...
8) (1 point) Honeycomb Flow Straightener -Anti-Turbulence Screens Silencer Fan Test Section Diffuser Inlet The wind...
8) (1 point) Honeycomb Flow Straightener -Anti-Turbulence Screens Silencer Fan Test Section Diffuser Inlet The wind tunnel shown above is; a) open circuit/suction/low speed wind tunnel b) open circuit/blow-down/low speed wind tunnel c) closed circuit/suction/supersonic wind tunnel d) closed circuit/blow-down/supersonic wind tunnel 9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m°, and absolute viscosity of air is 1.825*10-5 Ns/m² (assume...
1. Consider a design of a low-speed open-circuit subsonic wind tunnel. The goal is to achieve a free stream velocity of 150 m/s at the test section of this tunnel. This wind tunnel is equipped with a U-tube mercury manometer that measures the pressure difference between the inlet (the settling chamber) and the test section. If the fan of the wind tunnel is able to generate the maximum pressure difference corresponding to a height difference of 10 cm on the...
1. [20 pts] An indraft wind tunnel pulls air into an inlet, through a contraction, the test section, and the diffuser, as shown below. The test section has a circular cross section and it has a diameter of 0.5 m. Assume the wind tunnel is at sea level and the temperature and pressure of the atmosphere are given by standard atmospheric conditions. (a) If the test section is designed to have a velocity of 200 m/s, determine the Mach number,...
The closed-circuit wind tunnel flows air with a velocity of 200 fu's (between sections (5) and (6)] at standard condition. The picture and diagram of the wind tunnels are provided below. The flow is driven by a fan that essentially increases the static pressure by the amount Pi-P that is needed to overcome the head losses experienced by the fluid as it flows around the circuit. Determine the pressure rise ( P P ) Conditions) Assume air is incompressible (Mach...
HW#4 (Due 3/14/2019) Problem 1: (10pts) Consider a wing is mounted in a subsonic wind tunnel, where the airflow velocity is 50 m/s. If the velocity at a point on the wing is 60 m/s, what is the pressure coefficient at this point? Problem 2: (1Opts) In Problem 1, if the test section air temperature is 280 K, and if the flow velocity is increased point? to 200 m/s, what is the pressure coefficient at the same
5. The closed-circuit wind tunnel flows air with a velocity of 200 ft/s [between sections (5) and (6)] at standard condition. The picture and diagram of the wind tunnels are provided below. The flow is driven by a fan that essentially increases the static pressure by the amount pı - p9 that is needed to overcome the head losses experienced by the fluid as it flows around the circuit. Determine the pressure rise (pi - ps). Conditions) Assume air is...
9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume there are no losses in the wind tunnel) Contraction ratio: 7 Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in the test section with a manometer (manometer fluid is water with...
For the air wind tunnel shown Honeycomb Flow Straightener Anti-Turbulence Screens Silencer Fan Diffuser Test Section Inlet Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m?, and absolute viscosity of air is 1.825*10-S Ns/m? (assume there are no losses in the wind tunnel) Contraction ratio: 7 Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in the test section with a...
8) (1 point) Honeycomb Flow Straightener -Anti-Turbulence Screens Silencer Diffuser Fan Test Section Inlet The wind tunnel shown above is; a) open circuit/suction/low speed wind tunnel b) open circuit/blow-down low speed wind tunnel c) closed circuit/suction/supersonic wind tunnel d) closed circuit/blow-down/supersonic wind tunnel 9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume...
8) (1 point) Honeycomb Flow Straightener -Anti-Turbulence Screens Silencer Fan Test Section Diffuser Inlet The wind tunnel shown above is; a) open circuit/suction/low speed wind tunnel b) open circuit/blow-down/low speed wind tunnel c) closed circuit/suction/supersonic wind tunnel d) closed circuit/blow-down/supersonic wind tunnel 9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m°, and absolute viscosity of air is 1.825*10-5 Ns/m² (assume...
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