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The majority of the Winter Olympics are racing events, and the improvement of the performance of racing events is crucial to the improvement of the overall level of the Winter Olympics. Recently, Professor Wang Jiadao, the head of the key technology and platform research project of winter sports drag reduction and the head of the Department of Mechanical Engineering of Tsinghua University, introduced the drag reduction science, skills and equipment research and development of snow and ice racing from the perspective of scientific drag reduction.

Wang Jiadao expressed that, The national key research and development program "Winter Olympics with Science and Technology" has carried out research projects on key technologies and platforms for drag reduction in winter sports. Based on the construction of sports wind tunnels, aerodynamic and friction resistance evaluation equipment, a world-class technical research and support platform for the sustainable development of racing sports has been formed. In addition, research on aerodynamic and friction drag reduction of ice and snow surface for winter speed racing projects has been carried out, and theoretical and key technological breakthroughs have been made in the fields of attitude optimization, equipment drag reduction, friction regulation, etc. The development of drag reduction equipment and wax such as snowmobiles, helmets, skateboards has helped athletes achieve the goal of "higher" and "faster" by significantly reducing the drag of winter Olympic speed racing projects.

It is reported that speed wins the race. In the process of ice and snow sports, When there is speed, it will produce relative movement with the air, and it will feel the wind The wind will produce resistance, called wind resistance. At the same time, if you want to exercise, you must follow the ground The surface has relative movement. In the ice and snow events, the ground is either ice or snow, Ice and snow will produce frictional resistance. These two parts of resistance constitute the total resistance in the progress of sports events. Motion drag reduction is mainly through air resistance and ice snow friction resistance The reduction of force can improve the performance of athletes.

In the process of movement, the athletes are in motion and the air is still It is not easy to measure the resistance at this time. What can we do? Wang Jiadao said that through Build wind tunnel, Keep the athlete still and let the air flow. The wind tunnel is built in a closed environment In the middle, the wind can move through the large fan. At this time, the person in the fan will not move The sample can cause the wind field in the process of movement. “ For example, skating and skiing, athletes are exposed to The resistance to arrival can be tested in the wind tunnel It can also be monitored. ”

Wang Jiadao expressed that, Athletes will maintain a comparative advantage in the process of advancing The air resistance caused by attitude is relatively small. Through wind tunnel drag reduction test, Put forward the optimization plan, and the athletes combine their own abilities to optimize themselves The attitude of. Through intensive training, the forward speed can be significantly improved.

Requirements of Ice Sports on Ice Skates There are two. One is that the friction resistance in the taxiing direction is smaller, and the other is the pedal The driving force should be strong when stepping, so that we can slide far. However, these two points are In many cases, it is contradictory. What should we do? According to Wang Jiadao, in order to take both sides into consideration, the ice skate is made into a sandwich like knot The hardness of the two sides of the ice skate is high, and the hardness of the middle is slightly low. So, the ice skate is During sideslip, the ice blade is sharp and wear-resistant, thus improving the lateral direction The pedal force reduces the friction resistance. It is estimated that the pedaling rate can be increased by 20% - 30%, the friction resistance can be reduced by about 10%.

"The Winter Olympics, like other major sports events, competes not only Athletes' technical ability is also the scientific and technological level of each country. Like the wind Hole, it reflects the strength of a country. Another example is equipment With the improvement of technical level, athletes can use better equipment to Can occupy certain advantages. This is also the charm of the Winter Olympics. " Wang Jiadao said. (Attached text: Qiao Yeqiong)

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