Noise efficiency of fan designs

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SUMMARY

The discussion focuses on the noise efficiency of various fan designs, particularly compressor blades and household fans. It highlights that noise generation is directly related to airflow velocity, with larger fans operating at lower speeds producing less noise. Additionally, the conversation touches on the implications of different fan designs, such as "waterwheel" schemes versus traditional parallel-axis designs, on overall output and noise levels. Understanding these dynamics is crucial for optimizing fan performance in both industrial and domestic applications.

PREREQUISITES
  • Understanding of airflow dynamics and velocity
  • Familiarity with fan design principles
  • Knowledge of noise generation mechanisms in mechanical systems
  • Basic concepts of pressure generation in fluid dynamics
NEXT STEPS
  • Research the impact of fan blade design on noise levels
  • Explore the principles of airflow velocity and its relationship to fan size
  • Investigate "waterwheel" fan designs and their efficiency
  • Learn about noise reduction techniques in mechanical fans
USEFUL FOR

Engineers, product designers, and anyone involved in the development or optimization of fan systems, including HVAC professionals and noise control specialists.

MisterX
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In particular I am wondering about compressor blades, but it's an interesting question to pose for household type fans as well. We can imagine "waterwheel" type schemes, and also the more traditional schemes where the axis of rotation is parallel to the flow. Which produces more noise per airflow? Also are there consequences of the various designs in terms of overall output?
 
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Typically, noise is a function of velocity. So to move the same amount of air with low velocity, use a larger fan and make it spin slower. Similar issue exists for generating pressure (generating pressure requires high velocity).
 

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