Dust sticking to fan blade downstream of rivet head

In summary, the comet-tail like effect seen on fan blades downstream of rivet heads is due to reduced pressure and velocity in those areas, creating turbulence and circular air flow. Flat headed rivets are the exception in aircraft design as they create lower pressure areas and can increase air speed and reduce fuel consumption. Recessed rivets, although more expensive, are preferred for maximum aerodynamic efficiency.
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Swamp Thing
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Why does dust stick to the fan blades just downstream of the rivet heads, forming a comet-tail like effect?

IMG_20220629_150011~2.jpg
 
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  • #4
It is an area of turbulence, into which air is drawn by lower pressure.
Velocity may increase, but in a chaotic way and in circular trajectories.
Same should happen over the thick trailing edge of each wood or plastic blade.

Recessed rivets are more expensive, but those make top speed increase and fuel consumption decrease.
Please, see:
https://en.wikipedia.org/wiki/Hughes_H-1_Racer#Design

 
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1. Why does dust tend to accumulate on the fan blade downstream of the rivet head?

The rivet head on a fan blade creates a small disturbance in the airflow, causing a low-pressure zone behind it. This low-pressure zone can attract and trap dust particles, leading to accumulation on the downstream side of the rivet head.

2. Does the shape or size of the rivet head affect the amount of dust accumulation on the fan blade?

Yes, the shape and size of the rivet head can affect the amount of dust accumulation on the fan blade. A larger or more rounded rivet head will create a larger low-pressure zone, resulting in more dust being trapped behind it.

3. Can the accumulation of dust on the fan blade downstream of the rivet head affect the performance of the fan?

Yes, the accumulation of dust can affect the performance of the fan. The dust can disrupt the airflow and create imbalances, leading to increased noise and decreased efficiency of the fan.

4. How often should the fan blade downstream of the rivet head be cleaned to prevent dust accumulation?

The frequency of cleaning will depend on the environment and usage of the fan. In general, it is recommended to clean the fan blade every 3-6 months to prevent excessive dust buildup and maintain optimal performance.

5. Are there any preventative measures that can be taken to reduce dust accumulation on the fan blade downstream of the rivet head?

Yes, there are a few preventative measures that can help reduce dust accumulation on the fan blade. These include regularly cleaning the surrounding area to minimize the amount of dust in the air, using a fan cover or filter to block dust from entering the fan, and choosing a fan with a more streamlined design to minimize disturbance in the airflow.

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