What does a high Reynolds number indicate?
The higher the Reynolds number, the greater the range of scales. The largest eddies will always be the same size; the smallest eddies are determined by the Reynolds number. What is the explanation for this phenomenon? A large Reynolds number indicates that viscous forces are not important at large scales of the flow.
How do you find the Reynolds number for a sphere?
The most widely studied case is the sphere. Figure 1 graphs the dependence of drag coefficient for a sphere and a cylinder in crossflow on the Reynolds Number Re = ρuD/η, where D is the sphere (cylinder) diameter, η the viscosity of liquid, and .
Is drag constant?
For most aerodynamic objects, the drag coefficient has a nearly constant value across a large range of Reynolds numbers. In all of the cases presented on this figure, the density, viscosity, and diameter of the ball are the same. The flow velocity is gradually increased from the left to increase the Reynolds number.
How fast can a CO2 dragster go?
around 90 kilometers per hour
What makes a dragster go fast?
Simply put, the less weight your dragster has, the faster it will go. Because the dragster has parts moving against one another, friction is created. You can help reduce it by making sure the axles are free to rotate, and that the wheels and tires are not rubbing on the car body.
What is CO2 used for in drag racing?
CO2 dragsters are cars used by miniature racing cars which are propelled by a carbon dioxide cartridge, pierced to start the release of the gas, and which race on a typically 60 feet (18 metres) track. They are frequently used to demonstrate mechanical principles such as mass, force, acceleration, or aerodynamics.
How are CO2 dragsters powered?
CO2 cars are propelled by carbon dioxide rapidly escaping from a small container called a cartridge. The cartridge is positioned in the car so that the escaping gas moves in a rearward direction. The rearward force of the escaping gas is the initial action described by Newton.
How do you determine the speed of the CO2 dragster?
Using a Pitsco launch and timing system, test the dragster using an 8-gram CO2 cartridge and time it for a 20-meter distance. The average velocity is calculated using the formula velocity equals distance (meters) divided by time (seconds), or v = d/t.
How does a CO2 cartridge power a dragster?
The CO2 cartridge is a small, metal cylinder filled with carbon dioxide that has been highly pressurized and sealed. At the flick of a button the gas is released, propelling the dragster forward.
How much force does a CO2 cartridge exert?
The general standard is that when CO2 reaches 70 degrees Fahrenheit, the gas obtains a pressure of around 852.8 psi when contained in the cylinder or vessel. If there is more CO2 in the cylinder, it will then be converted into a liquid form.
What are CO2 dragsters made of?
CO2 dragsters are made of lightweight material usually balsawood or basswood. They are propelled down a track by compressed carbon dioxide gas.
How many tires can a CO2 cartridge fill?
two tires
Are spoilers a good idea on CO2 cars?
“Usually, spoilers are intended to increase downforce – they deflect air upward, which creates a downward force on the car,” says Dr. But a spoiler only works if it’s cutting through the air at the correct angle, Agelin-Chaab adds. “Factory-installed spoilers on higher-end sports cars are very effective.
What is CO2 used for in turbo cars?
CO2 puts the pressure on the wastegate to hold the valve closed as soon as or before it is actually needed. It reduces SO MUCH time when trying to build boost or spool a turbo engine. This saves not only time but puts less stress and reduces temperature to your torque converter and transmission!
How do you reduce drag on a CO2 car?
Because the dragster has parts moving against one another, friction is created. You can help reduce it by making sure the axles are free to rotate, and that the wheels and tires are not rubbing on the car body.
What is the average mass of a CO2 car dragster including the CO2 cartridge?
about 50 grams