What is the difference between wind pressure and air volume?

Question 1: Should the wind pressure or air volume be increased? Be careful not to mess around!

The effect of sealing the outlet is to increase the wind pressure in front of the outlet. This increase in wind pressure is achieved by decelerating the small outlet area. As the saying goes, the air flow does not flow and the wind pressure is suppressed. . If the air discharge volume is reduced and the air flow rate is reduced, won't it become harder to inhale your pine cigarette?

If there is no problem with the motor and other aspects, first check whether the outlet connecting pipe is too long or too thin, that is, the resistance of the exhaust system is too great. You can remove the outlet pipe and try to see if it works well. , if it still doesn't work, that's not the problem here.

Is the area at the inlet too large, that is, the amount of air flowing into the suction side is too large, so if conditions permit, seal the inlet smaller to see if it can be better;

This kind of The equipment generally does not suck very far. This involves a lot of knowledge about liquid mechanics, so I won’t go into details. For example, if you put some flour on the table, it is easy to blow it away with your mouth, but it may not be easy for you to suck it into your mouth. This is the reason.

However, increasing the wind pressure means increasing the negative pressure at the entrance. The greater the negative pressure here, the greater the suction range and the better the effect. The resistance at the outlet must be small. If the resistance is large, the air flow resistance will be large, and the air flow will become smaller. If the amount of air flow on the suction side is small, wouldn't the suction force be smaller?

To put it bluntly, if you block the exit, no air can pass through it, so what do you expect to be sucked out?

If you have to answer the question, the answer is to increase the air volume

Question 2: Does wind pressure affect air volume? You can say yes or no, it depends on the wind pressure and air volume you are talking about. specific meaning.

If wind pressure is dynamic pressure, it will definitely have an impact on determining the air volume of the section. The greater the average dynamic pressure, the greater the air volume, and vice versa;

< p> If it is the air volume in a sealed duct with no splitting, equal cross-sectional area, then the total pressure at any section is changing (although the dynamic pressure remains unchanged, the static pressure is changing), but at any section The air volume will not change.

Question 3: The relationship between fan air volume and wind pressure. The ratio of pressure is equal to the square of the air volume ratio

It is also equal to the square of the speed ratio

Question 4: Wind speed, wind The relationship between pressure and air volume for 30 minutes. You may be talking about the speed of the fan.

There is a cubic relationship between fan power and speed. Because the air volume is linear with the rotation speed. Wind pressure has a square relationship with rotational speed. Fan power is equal to air volume multiplied by wind pressure. so.

Question 5: Two fans with the same air volume but different air pressure? Two fans with the same air volume but different wind pressure have different cross-sectional areas of the air outlet pipes. The one with high wind pressure has a small cross-sectional area, and the one with small wind pressure has a large cross-sectional area. When it comes to two spaces of the same size, the airflow with high wind pressure will It's very exciting, and it's moving when it's very far away. When the wind pressure is low, it's not very exciting when it reaches a space, and it spreads to all directions at a short distance.

Question 6: Why does the smaller the air volume, the greater the wind pressure? Why does the smaller the air volume, the greater the wind pressure? ------- Maybe you are referring to a specific situation, such as a certain blower, a certain air compressor The air supply condition of the machine is that when the outlet pipe is very long and the pipe diameter is small, the pipe resistance is very large, the air supply is blocked, and the pressure is reduced. But when the air outlet pipe is large and short, the air consumption is very large, exceeding the blower and air supply. The air supply capacity of the press is used as soon as the air comes out. There is no possibility of increasing the pressure, so the pressure is naturally small. Of course, this situation is not suitable for natural wind!

Question 7: Is there a relationship between the wind pressure and air volume of the fresh air system? Wind pressure is very important for the fresh air system, because filtered fresh air needs to be introduced into the room, and the wind pressure is not enough. If there is no wind at the end air outlet, then the fresh air system will lose its essential function. Wind pressure is the pressure generated during ventilation. If the wind pressure is too small, the resistance cannot be overcome, the air transport distance will be very short, and the air volume will be very small.

Question 8: What is the relationship between the speed of the fan and the air volume? The fan relies on its air volume to complete the ventilation process, so in many cases we need to consider the size of the fan's air volume. To master the control of fan air volume, we must first start with several factors that affect the fan air volume, and control each influencing factor within an effective and reasonable range. Then the air volume of the fan will not be difficult to adjust and control. When the fan is running It has an inseparable relationship with the speed of the fan. The speed of the fan will also affect the air volume. So what is the direct relationship between them? Under normal circumstances, the air volume of the fan is directly proportional to the speed during operation. The greater the speed of the fan, the greater the air volume of the fan. Although it cannot be narrowly said that the air volume of the fan is only related to the speed, it cannot be denied. inevitable connection between them. The fan will forcefully transport a certain volume of air volume through the rotation of the impeller. However, different models of fans are also different. Just like the Roots blower, it can only rotate to output air volume, and this fan itself does not have an internal compression device. So it won't produce any pressure, but where does the pressure come from during use? In fact, its pressure comes from the system back pressure connected to the back end of the fan. For ease of understanding, you can imagine that the front and rear ends of the fan are open, that is, it sucks air from the atmosphere and exhausts it to the atmosphere. Then you can imagine that if a pressure gauge is installed at the exhaust end, the pressure gauge will show a pressure of 0. But if If you connect the exhaust end to a sealed can, then when the fan is turned on, because the fan keeps supplying air into the can, will the pressure displayed on the exhaust end pressure gauge continue to rise, because the air volume of the Roots blower is only the same as the air volume of the Roots blower? The speed is related, so no matter how the pressure at the exhaust end rises, as long as the speed of my fan remains unchanged, the exhaust pressure will continue to rise until it exceeds the load and shuts down. This is the direct relationship between the air volume and speed of the fan. Therefore, if the user wants to control the air volume of the fan, he must first learn how to control the speed of different types of fans, so that he can control the air volume with ease. The company provides a variety of fan products, including AC centrifugal fans, multi-wing blowers, metal axial flow fans, cooling fans and other series of cooling fan products, fan accessories, etc. The fans are complete in size and of military quality. Our fans have a 5-year warranty. Fan products are trustworthy.

Question 9: Can the specific relationship between wind pressure, air volume and wind resistance be expressed by a formula? 20 points Q=ν*r^2*3.14*3600; D=√Q*4/(ν*3.14*3600) ;P=RL;R=(λ/D)*(ν^2*γ/2g).

Q-flow rate (h/m3); ν-flow rate (m/s); r-pipe radius (m); D-pipe diameter (m); P-pressure (kg/m2); R-frictional resistance along the way (kg/m2); L-pipeline length (m); g-gravitational acceleration=9.8. Pressure can be converted into Pa as follows:

1 Pa=1/9.81 (kg/m2)

Question 10: What do wind speed, air volume and wind pressure mean? Wind speed is the speed of the wind, that is, the distance it travels per unit time.

Air volume is the flow rate of wind, that is, the capacity flowing per unit time. The air volume is related to the cross-sectional area and wind pressure. When the cross-sectional area and wind pressure are the same, the greater the wind speed, the greater the air volume.

Wind pressure is the pressure of wind. When the wind speed and cross-sectional area are the same, the greater the wind pressure, the greater the air volume.