| It is well-known that the hydraulic ram pump, which was invented in the 18th century, is quite different from the traditional turbo pump in its function and action principle. So far as the function is concerned, the hydraulic ram pump does not require external work input, instead the high pressure stream is obtained through the energy inherent in the fluid flow; as for the action principle, the hydraulic ram pump achieves the objective of pressure increase and stream diversion by using the water hammer effect of the unsteady flow. The hydraulic ram pump has been widely applied to water lifting in mountain areas and agricultural irrigation etc in many countries (especially in Russia, U.S., England and China). However, because the hydraulic ram pump mainly depends on the periodic switch of two valves, it has many significant drawbacks, such as intermittent water supply, strong vibration, fragility, large occupied area, high maintenance frequency and so on, which make it difficult to satisfy the requirements of practical applications.In this paper, a water wave pump, which can incessantly produce the water hammer effect and gain high pressure flows, has been successfully developed by combining the work principle and efficiency-energy transfer mode of the hydraulic ram pump and the pressure wave supercharger. Subsequently, a number of experiments were performed and many useful data were obtained. During the course of this research, following achievements have been made:1. The theoretical foundation for the water wave pump, a new type of pump, has been proposed by using the principle of pressure wave of water hammer, the unsteady phenomenon of fluid flows. By analyzing the fluid dynamics involved in water wave pump, the methods for analysis and calculation were obtained. Furthermore, one-dimensional unsteady flow at the average radius of the water wave pump was calculated, and the problem for the radial equilibrium at the inlet and outlet of the water wave pump was also calculated and analyzed theoretically.2. The technical design for structural type and machinery manufacture of the water wave pump was finished for the first time, and a prototype water wave pump was successfully produced in September 2006. By testing the water wave pump, necessary modification for the prototype was performed, and consequently the computational theory and techniques for machinery manufacture of the design of water wave pump were improved.3. The experiments and improvement study for the prototype water wave pump had been performed for more than half a year, and some problems found during the experiments were solved, and a number of useful data for optimizing and improving the machinery structure of the water wave pump were provided.4. The accuracy of the typical calculation cases for one-dimensional unsteady flow and the theory and calculation of computational fluid dynamics for design of the water wave pump, which were adopted in this paper, was proved initially by the results of developing and testing for the water wave pump, and it provided theoretical basis and technical guarantee for the future study for serialized industrial application of the water wave pump. Particularly, different wave type could be selected according to different purpose, and it provided a reliable condition for wide popularization and application of the water wave pump.5. The disadvantages of the hydraulic ram pump and the pressure wave supercharger have been overcome by the developed water wave pump, and a new type of pump with independent intellectual property rights would be the first to be developed in the world.In addition, the water wave pump is superior to the hydraulic ram pump in the operational performance for its simple designed structure and convenient manufacture.
|
PDF Full Text Request