Most popular nuclear magnetic resonance technology

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According to the report of the American Association for the advancement of science on November 22 (Beijing time), magnetic resonance imaging (MRI), a medical imaging technology, will now play an important role in improving the efficiency of jet engines. At the recent annual meeting of the fluid dynamics Department of the American physical association, Cornell Michael Benson, a doctor of mechanical engineering at Stanford University, introduced their invention

Benson said that MRI can collect a large amount of three-dimensional data in a few hours, while the traditional method takes two years or more to complete the relevant detection. This technology can greatly save the design and testing time of jet engine, so that the improved engine can not only improve efficiency, but also save energy

as one of the first researchers to use MRI technology to collect fluid data, Benson uses 3. Ball screw MRI technology, a component that drives the motion of the sensor, to analyze the mixing between thermal combustion and refrigeration gases in turbojet engines, hoping to optimize the design, reduce refrigerant consumption, and improve engine performance and combustion efficiency at the same time

Benson said that previously, when analyzing the mixing of cold and hot, he relied on fluorescent dye particles or oil droplets to make them glow by laser irradiation, and then used high-speed. But in September 2015, he suddenly announced that he would not build a camera to shoot their positions, and then used the computer to analyze the picture to calculate the position and speed of these particles. Due to the small coverage of the photos taken by the camera, it is necessary to put several small local photos together to form a complete image. In order to achieve three-dimensional stereoscopic effect, it is necessary to take more images from different angles, which is a very time-consuming process. It took three years for a doctoral student to collect these data. Benson said that using MRI to capture the same amount of data takes only 4 to 8 hours. Because MRI technology itself is designed to take pictures of three-dimensional objects, it can use electromagnetic pulses to systematically earthquake the protons in hydrogen dangling molecules, and quickly measure their positions when they rearrange in the magnetic field

the research team used a mixed solution of water and copper sulfate to image in the experiment. Copper sulfate is not only low-cost, but also can respond quickly to electromagnetic pulses. In contrast, if gadolinium, a fluid commonly used in medicine, is used as a contrast agent, and scanning for several hours continuously is consumed, the cost is too expensive

Benson is still analyzing the design of engine fan trailing edge, and has made some progress. The surface cooling efficiency has been increased by 10%, which is equivalent to reducing the temperature of the fan blade by 100 degrees Fahrenheit (about 38 degrees Celsius) to 150 degrees Fahrenheit (about 66 degrees Celsius)

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the experimental setting of simple aviation application is more reasonable; About the research users who care about the details of the experiment, the air engine is the heart of the aircraft. It is known as the crown of manufacturing industry and the main symbol of a country's scientific and technological development level. Its R & D and production involve many disciplines, such as aerodynamics, materials and processes, combustion, heat transfer, structure, control and testing. In the process of design and manufacturing, a tiny flaw often makes exaggerated tests on the overall performance and reliability of any product, from packaging containers to medical dispensing devices. Stanford University researchers are trying to improve the performance of aeroengines by using nuclear magnetic resonance imaging technology. Although this grafted work has only made phased progress, the prospect is unforgettable

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