Today, the science popularization ship to introduce to you is one
Can "pull the wind"
Familiar and unfamiliar objects
Bowl sails
The reason for the familiarity is
Sail everyone knows, right?
The reason for the strangeness is that
This shape of the sail may be felt by everyone
There are -some -eye-life
It can be seen from the merging of the words
It's all "sails"
Its function is also clear at a glance
Provide kinetic energy, ie
——
"Propulsion device"
Bowl sails
As a new type of propulsion device, the rotary sail can adjust the speed according to the wind direction at any time to make full use of the wind; compared with the traditional sail, the rotary sail occupies a small deck space, is not affected by the harsh wind conditions, and has the most obvious effect on the lateral wind.
Recently
Due to the advantages of maritime transportation costs and transportation volumes
Maritime transport has become an important way of global trade
But at the same time
The pollutants emitted by ships are also increasing year by year
for the global environment and climate
Make a huge impact
With the continuous improvement of environmental protection standards for ships
Through the wind energy and other green energy
Exploitation
to reduce fuel consumption
Become an energy-saving and emission-reducing enterprise in the shipping industry
An important way
It is not difficult to see this
The background of the rotary sail spawn is
——
Low-carbon environmental protection requirements
The advent of the bowl sail
This makes the ship reduce operating costs
and the overall fuel consumption at the same time
Greatly improve the economic benefits
Reduced carbon footprint
Improved atmospheric environment
So it seems
These "pillars" are really exquisite
Mention the energy-saving principle of the bowl sail
I have to mention it
The Magnus effect
The Magnus effect is ubiquitous in ball sports, taking a rotating sphere as an example, when the direction of rotation of the sphere is the same as the direction of the air flow, a low pressure is generated on one side of the sphere and a high pressure on the other side. When the advancing sphere rotates in a clockwise direction, because its lower side is opposite to the direction of air flow, the air flow rate is slower, so that the pressure on the lower side of the sphere is greater than that of the upper side, resulting in an upward lift, and the phenomenon of deflection of the trajectory of the sphere under the action of lift is called the Magnus effect.
According to the Magnus effect
The rotating bowl sails that rotate through the engine have friction
It will drive the surrounding gases to rotate together
When there is a sidewind blowing
Causes the air velocity on the side of the duct to increase
The flow rate on the other side slows down
The faster the fluid flows, the lower the pressure
The flow field around the rotating headpiece will create a pressure difference
This in turn provides thrust for the ship to move forward
Bowl sail system
Simple construction and small weight
Only a small motor is required
This produces a noticeable thrust
And by adjusting the bowl sails
Speed, lift size, etc
So as to achieve a rational distribution of energy
Reduce shipping costs
Didn't expect that
After the Magnus effect "crossover"
Make a big splash on the ocean
The small figure spun in circles
It converts wind energy into kinetic energy
but
Just say don't practice the fake handle
Back in 2018
Shanghai Shipbuilding Institute, a subsidiary of China State Shipbuilding Corporation
For Greek shipowner Victoria Steamship
Designed for a 64,000-ton bulk carrier
The "AFROS" has successfully applied the bowl sail
Four rotary sails were installed on the deck of the vessel as auxiliary propulsion power units, and it was the first bulk carrier in the world to install a pneumatic energy-saving device.
In 2021
Designed by Shanghai Shipyard
325,000 tons of super-large ore vessels delivered
The vessel is the first mineral sand vessel in the world to be equipped with a bowl sail, with 5 bowl sails installed .
although
Rotary sail technology was introduced in the 19th century
But until the 1980s
to restore the app more efficiently
The technology is applied to large ships
It's a matter of recent years
Modern giant ships
Plug in the wings of the sail again
It not only reduces the energy consumption cost of ships going to sea
Reduced carbon emissions to the environment
And it can reduce the load power of the ship engine
Thus effectively extending the service life of the equipment
Smart naval architect
Bring the sails to this old installation of old songs to sing new songs
It's wonderful
！！！
Source: China State Shipbuilding Group's official WeChat