Calculating Energy for Water Propulsion with Circular Blades

  • Context: Undergrad 
  • Thread starter Thread starter Forlax
  • Start date Start date
  • Tags Tags
    Energy Fan Water
Click For Summary
SUMMARY

To calculate the energy required to propel water using circular blades at a speed of 3 meters per second, one must determine the power, which is energy per time. The calculation involves assessing the mass of water being moved and its velocity, applying the kinetic energy equation. This value represents the minimum power requirement, assuming 100% efficiency in converting propeller work to kinetic energy. Real-world applications typically see efficiencies between 50-75%, influenced by factors such as Reynolds number and specific propeller design.

PREREQUISITES
  • Understanding of kinetic energy equations
  • Familiarity with fluid dynamics concepts
  • Knowledge of propeller efficiency metrics
  • Basic grasp of Reynolds number implications
NEXT STEPS
  • Research the kinetic energy equation and its applications in fluid mechanics
  • Explore the relationship between Reynolds number and propeller design
  • Study efficiency calculations for pumps and propellers
  • Investigate advanced fluid dynamics simulations for propeller performance
USEFUL FOR

Engineers, fluid dynamics researchers, and anyone involved in the design and optimization of water propulsion systems using circular blades.

Forlax
Messages
1
Reaction score
0
How would you go about calculating the energy required to propel water through a circular-type blade at 3 metres per second??

Thanks.
 
Physics news on Phys.org
in this case you would be calculating power (energy per time)

think about how much mass is moving, and how fast it is going.

then use the equation for kinetic energy.

bear in mind, that this is the MINIMUM amount of power required, since it is assumes 100% conversion of propeller work to kinetic energy. The actual number is much greater and difficult to predict.

It is probably only estimable by using correlations based on the reynold's number and propeller design.
 
Obviously it depends on the device, but you can figure 50-75% efficiency for a pump or propeller.
 

Similar threads

Undergrad Energy requirements of a 4 wheel drive boat
  • · Replies 20 ·
Replies
20
Views
2K
Undergrad Is the Blade Loading Sufficient for Minimum Sliding Resistance at Top Speed?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad How to calculate the kinetic energy of an object propelled by a magnet?
  • · Replies 15 ·
Replies
15
Views
1K
High School Will there be water coming out of the last hole?
  • · Replies 17 ·
Replies
17
Views
2K
High School Energy transfer water > air in a greenhouse
  • · Replies 5 ·
Replies
5
Views
959
Undergrad Filling a pool with the hose end above or in the water
  • · Replies 11 ·
Replies
11
Views
4K
High School Pumping water upwards into a large water tank
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Calculating Water Pool Depth: Factors to Consider in Fluid Dynamics
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad I'm calculating more energy out than I put in
  • · Replies 138 ·
5
Replies
138
Views
9K
Undergrad Wondering how much thrust a drone propeller generates
  • · Replies 6 ·
Replies
6
Views
6K