Feasibility Study of Compressed Aerodynamic Vehicle Dr. Xu Hong introduced the structural characteristics of the working principle of compressed air-powered vehicles and their "zero pollution" characteristics, analyzed the energy conversion process of compressed air power, and the characteristics of the vehicle battery used in common electric vehicles. This paper introduces the power distribution mode and vehicle characteristics of compressed air-powered vehicles and the storage characteristics of compressed air. It is considered that the compressed air-powered vehicle is feasible in principle, technically achievable, and it is non-polluting, simple in structure, and manufactured. And a new type of power car that is easy to use and has broad application prospects. 1The progress of environmentally-friendly vehicles From the battery-powered EV electric vehicles in the 1930s to the current HEV composite electric vehicles and alternative fuel vehicles, the research and development of automotive energy has never stopped replacing fuel vehicles, such as natural gas (CNGLNG). Automobiles, alcoholic vehicles, dimethyl ether (DME) vehicles still have emission pollution and thermal effects. Some fuels are also toxic. Some fuel combustion control is difficult. Electric vehicles have no pollution during driving, low noise and high energy conversion efficiency, but battery-driven. The electric vehicle is subject to the vehicle battery, and it is difficult to achieve practicality in terms of specific power, cycle life, charge and discharge performance, cost and safety. At the same time, the battery itself also has serious secondary pollution. The hybrid electric vehicle has battery electric The advantages of vehicles and internal combustion engines, but there are still emissions problems. Because there are two sets of power units, the drive and control system is more complicated. Fuel-cell electric vehicles are highly anticipated. The most promising proton exchange membrane fuel cells are currently considered to be the most promising. (DEMFC), can achieve zero emissions, high energy conversion rate, simple structure However, the manufacturing cost of the fuel cell is relatively high, and there are many problems in the safe storage, preparation and filling of the hydrogen gas, which restricts the development and practical use of the electric vehicle. The solar electric vehicle still needs to reduce the battery volume and improve the photoelectric conversion efficiency flywheel. Battery technology has not yet made breakthroughs. People are looking forward to a new type of non-polluting use: 2002-Fund Project: National Natural Science Foundation-Ford Fund-funded Project (50122115), the emergence of energy, compressed air energy just meets this requirement 2 Principles of Compressed Aerodynamic Vehicles Compressed aerodynamic vehicles use high-pressure compressed air as the power source. Air acts as a medium. When the vehicle is running, the compressed air storage pressure energy can be converted into other forms of mechanical energy. The liquid air and liquid nitrogen absorb heat and expand. Other gas-powered vehicles that are powered are also in the pneumatic vehicle category. The working principle of pneumatic vehicles is basically the same as that of traditional vehicles. The biggest difference is the difference in the source of the vehicle's power. The overall structure of the engine can still be borrowed from the traditional car model for the compression of the French MDI company. Aerodynamics and internal combustion engine If the spherical constant-volume combustion chamber and its corresponding device are removed, it becomes a purely compressed air-powered engine, and the intake phase is reasonably arranged. Each piston will reciprocate under the push of compressed air. The compressed aerodynamic engine has a rotation. Various types of structures, such as piston type and air motor type, only the reciprocating piston type is reported. In order to have better dynamic characteristics and structural characteristics, it is generally designed to operate in a multi-cylinder compressed air-powered engine. After the compressed air is depressurized, it absorbs heat through the heat exchanger, then enters the working cylinder to push the load movement. By adjusting the gas pressure and flow rate entering the working cylinder to adjust the dynamic characteristics of the engine, the cylinder diameter, the number of cylinders and the layout can be obtained in various forms. Feasibility Analysis of Engine 3 Compressed Aerodynamic Vehicle 3.1 Energy Analysis The requirements for the performance of compressed air powered vehicles are the same as those of conventional cars. The key to determining the prospect of compressed air powered vehicles is how to improve the energy utilization rate of compressed air. The expansion work done and the pressure energy stored in the compressed air The decompression process of air from high pressure to low pressure, curve 12 in the figure represents the isothermal and adiabatic expansion process of compressed air, and the actual decompression expansion work process is between the curves 12. In the figure, PiVi - starting point gas pressure, volume; A is the starting point, BCDE is the pressure grading point of the corresponding grading pressure control, at these points there is an isometric endothermic process, such as B-C and E curve 1 and The area contained between the coordinates ViV2 represents the gas expansion work that can be converted by the release of energy stored in the compressed air. Assume that the inflation pressure of the high-pressure gas tank is 1 gas storage volume is Vi, and all the expansion work that can be done when the ideal gas of curve 1 is completely isothermally expanded to normal pressure is the end state after expansion (P2, V'2) France The parameters of the MDI engine are the initial gas storage pressure p 300L, the pressure at the end of the room temperature 2 = 0.1MPa, by the 41 nickel cadmium battery 55 nickel hydrogen battery 80 sodium sulfur battery 100 sodium nickel chloride battery 120 lithium ion battery 150 Lithium polymer battery 115 zinc air battery 180 aluminum air battery 200 compressed air (normal temperature, 30MPa, 300L) 61 At present, Germany, the United States and other countries have ultra-high pressure inflatable equipment, China can also produce aluminum alloy liner carbon fiber winding ultra-high pressure storage Gas tank. Improvements in the canning process will further increase storage pressure and increase specific energy. Assuming a working temperature of 27 ° C, the mass of compressed air with a volume of 300 L and a pressure of 30 MPa can be determined to be 104. The weight of the gas tank is about 130 kg, and the specific energy of the corresponding compressed air is about 61 W'h/kg. Table 1 is compressed air. Power and a variety of on-board battery specific energy to improve the efficiency of compressed air use, increase the tank capacity and increase the inflation pressure is the main means to increase the mileage of an inflatable mileage, of course, increase the capacity of the tank is limited by the effective space of the car, increase the inflation pressure The problems associated with the canning process are related to Z in terms of tank volume inflation pressure and steam recovery, less damage decompression control and reasonable power distribution. Further research is needed. 4 characteristics of compressed air-powered vehicles Compressed aerodynamic vehicles in the process of electric f-pressure f-mechanical energy conversion, no (mineral) fuel combustion, emissions are still no pollution, no heat radiation, the noise is small, is The true "green" and "zero pollution" concept of the car compared with the traditional car, its engine works without fuel combustion process, so the engine structure is simple, small size, light weight, low cost, low material requirements, design And easy to manufacture. Compared with cars with liquid nitrogen and liquid air, the gas absorption is relatively small when the gas expands, and much less than the preparation and storage cost of liquid nitrogen and liquid air. Internal combustion engine power and compressed aerodynamic hybrid vehicles can completely solve the problem of heat absorption, especially when the ambient temperature is low. The energy transmission of compressed air-powered vehicles is fast and easy to store. The source of air medium is convenient, clean and cheap, and the required power energy is easy to obtain. The cost of social infrastructure such as household inflatable equipment and gas station is not high, and it is easier to build. Low maintenance and production costs, and the use of existing pneumatic technology, automotive design and manufacturing technology, development and development of urban centers, key tourist areas, nature reserves and areas where noise requirements are critical Or small and medium-sized tool transport vehicles used indoors, as well as short-distance vehicles, military submarines, etc., compressed air power will be irreplaceable. China's power resources are very rich, and oil resources are relatively scarce, compressed air-powered vehicles are right. The good secondary utilization of electric energy is in line with the general trend of energy structure adjustment in China and in the future. 5 Conclusions Compressed aerodynamic vehicles are a new type of “zero pollution†automotive compressed air powered vehicles that are different from internal combustion engines and various electric vehicles. The principle is simple and cost-effective, and it is environmentally friendly and resource-saving. Sustainable Development Strategy. Compressed aerodynamic vehicles have obvious advantages in technology, and the compressed air source is convenient, and the energy storage method is superior to other methods such as electric and hydraulic. The research ideas of pneumatic car engines can be based on existing automotive technology, pneumatic control and pneumatic systems are already mature technologies, and related high-pressure pneumatic control components are also technically feasible. There is an optimal matching parameter between the mileage of the vehicle, and the compressed air can be expected. The compressed air-powered vehicle is the largest variable in the general occasion and the mass usage rate Z. The engine structure is optimized, and the energy special field can be widely applied. Numerical Analysis Model of Warpage Deformation of Products——Guo Zhiying阮 Xueying Li Dequn Article Number:1004-13X(2002)17-1515-03 Numerical Analysis Model of Warpage Deformation of Injection Molding Products Guo Zhiying, Guo Zhiying, Qi Xueyi, Li Dequn, Deformation Finite Element Simulation Mathematical Model, The simulation results are verified by experiments, which proves that the warpage deformation model and the analysis software are correct. Injection molding is the preferred method for mass production of plastic products. However, how to reduce and prevent the warpage that often occurs in the forming of products is a major problem that often plagues engineers. It relies on traditional experience and techniques and attempts to solve problems. Therefore, CAE technology is applied. Injection molding, warp deformation prediction, to optimize product, mold design and injection molding process parameter settings, thereby improving production efficiency and forming quality, is a new way to solve the problem of warpage deformation. 1 Warping deformation finite element analysis model A variety of residual stresses may be formed during the forming process of injection molded products. The stress-strain constitutive equation is the residual stress generated by the uniform cooling process; it may be generated when the mold is exhausted or the product is ejected. Stress; the thermal strain generated when the product is cooled to room temperature after being molded, using the principle of virtual work = ITdV++Fi++ volume; displacement; the equivalent thermal load for the thermal stress generated by the product after cooling; The equivalent load formed by the residual stress; the equivalent load of the temperature stress generated by the uneven cooling in the mold; the load that may be generated by the uneven thrust during the die. And there are Hu Xiaojun, Dong Mingjing, Jiang Shuyun and so on. The new process of flywheel energy storage technology Xi Ming, Sun Fengchun. Overview of electric vehicle energy storage technology. Post-doctoral researcher of the State Key Laboratory of Body Drives and Controls (Editor Su Weiguo). The research direction is pneumatic servo system, gas-liquid joint control servo system and its control strategy, pneumatic car. Published papers more than 10 articles 1 Received date: 2001- 0 One fund project: National Natural Science Foundation of China (59975032); National 211 Project Funded Project
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