![]() Acta Aeronautica et Astronautica Sinica 38(4):120459 Liu XC, Zhu XP, Zhou Z et al (2017) Research on low Reynolds number airfoils based on application of solar-powered aircraft. J Appl Mech Eng 2(5):309–321Ĭhen XK, Guo Z, Yi F et al (2014) Aerodynamic shape optimization and design of airfoils with Reynolds number. Karasu I, Açikel HH, Genc S (2013) Numerical study on low Reynolds number flows over an aerofoil. Acta Aeronautica et Astronautica Sinica 37(4):1114–1126 Aerosp Sci Technol 52:207–214Ĭhen LL, Guo Z (2016) Numerical analysis for low Reynolds number airfoil based on γ-Re θt transition model. Morgado J, Vizinho R, Silvestre MAR et al (2016) XFOIL vs CFD performance predictions for high lift low Reynolds number airfoils. China Aerospace Press, Beijing, pp 146–147 Li F, Bai P et al (2017) Aircraft aerodynamic at low Reynolds number. Gao G, Li Z, Song B (2010) Key technologies of solar powered unmanned air vehicle. These design experiences can provide valuable reference data for the design of the high subsonic NLF airfoil at low Reynolds number. We demonstrate that it is a reasonable design idea that the friction drag increment is proposed as a constraint condition. Our simulation results indicate that the optimized distribution shows better ability to control separation position and reattachment position, and the pressure drag can be greatly reduced when the laminar separation bubble is weakened. More specifically, the laminar separation bubble and transition location are controlled in the optimization process. After that, we build up the optimization system which employs the MCPSO (Multi-Groups Cooperative Particle Swarm Algorithm) as the search algorithm, and then apply the optimization methodology to the design of a propeller tip airfoil. The aerodynamic characteristics are evaluated by the γ-Re θt transition model, and a modified CST method based on the disturbing CST basis function is introduced in the airfoil parameterization. Port colossus DP World Group of Dubai last year invested in the concept, joining backers including French national rail company SNCF, US industrial conglomerate General Electric and Russian state fund RDIF.We developed an optimization design approach which can be used to the high subsonic Natural Laminar Flow (NLF) airfoil design at low Reynolds number. Hyperloop One says the system offers better safety than passenger jets, lower build and maintenance costs than high-speed trains, and energy usage, per person, that is similar to a bicycle. Pods would rocket along rails through reduced-pressure tubes at speeds of 1,200 kilometers (750 miles) per hour. Hyperloop One, which has raised more than $160 million, was set on an idea laid out by billionaire Elon Musk, the entrepreneur behind electric car company Tesla and private space exploration endeavor SpaceX. Hyperloop One wants to get three systems underway, chief executive Rob Lloyd told AFP at the time. ![]() Viable submissions had to be condoned by government agencies that would likely be involved in regulating and, ideally, funding the futuristic rail. Hyperloop One early this year disclosed a list of locations around the world vying to put near-supersonic rail transit system to the test. Hyperloop One also announced on Wednesday that it has built a prototype pod designed to carry people or cargo through the systems low-pressure tubes. Systems tested in May included the motor, vacuum pumping, magnetic levitation, and electromagnetic braking, according to the company. Hyperloop One had originally promised a full-scale demonstration by the end of 2016, after a successful test of the propulsion system. ![]() "By achieving full vacuum, we essentially invented our own sky in a tube, as if you're flying at 200,000 feet (60,000 meters) in the air." "Hyperloop One has accomplished what no one has done before by successfully testing the first full scale Hyperloop system," said startup co-founder and executive chairman Shervin Pishevar. The test vehicle accelerated to a speed of 70 miles (112 kilometers) per hour during the test, and the company's next goal is to ramp the speed to 250 mph (400 kph), Hyperloop One said in a release. The test took place in May at the company's development track in the Nevada desert near Las Vegas, and involved a vehicle coasting above tracks for slightly more than five seconds using magnetic levitation, according to the startup.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |