The three-dimensional turbulent flow of high speed elevator is numerical simulated using the static uncompressible Navier-Stokes equations. The equations are solved using finite volume method with second order upwind spatial discretization. The car of the high speed elevator is a box with the length of 2.3m, with the width of 1.7m, and height of 2.4m. Blockage ratios of 0.595, 0.512 and 0.446 are researched on the effects of the aerodynamic performances. A serial of elevator well is built according to the blockage ratio of 0.595, 0.512 and 0.446. The aerodynamic performance especially the drags of the elevator cars are computed. The results show that with the blocking ratio decreases, the pressure and the drag forces of the high-speed elevator decrease.
To inaugurate a new era of e-business development and face both opportunity and challenge of audit, it is necessary to introduce some new technology in traditional audit. Based on the analysis of the environment of e-business in China, the solutions and key technologies to audit in such environment are discussed in this paper.The basic task of audit work is to censor the authenticity and correctness of the business materials, and further study the legitimacy, rationality and validity of the economic activity that the materials reflect. With the development of financial informatization and enterprise informatization, the audit informatization is pushed forward constantly. E-business is an advanced form of enterprise informatization, and its essential feature is the application of IT and network. And it is target is to realize business operation and management in a virtual, digital and more convenient form [1]. However, e-business is a double-edged sword, which creates an almost whole new auditing environment, offers a platform for improving the auditing quality and efficiency and for decreasing its cost. E-business inspires the great changes and innovation of the audit theory, method and means, at the same time it brings new risk and challenge to audit [2]. On the other hand, the audit informatization also provides protection for sound development of e-business.
Physical structure are compared between air-water were obtained, which can provide theoretical help for the plate heat exchangers (PHE) and tube-fin type heat exchangers in design and the manufacture of the air-water PHE. this paper, which show that the air-water PHE has the stable character in handling the cold air below 0 because of its compact and knock-down structure. Then the courses of water being iced in the motionless state and in the flowing state were simulated by the CFD software Fluent with the model of Solidification/Melting. The results show that the corrugated passages of the air-water PHE are anti-frozen structures for flowing water, which is appropriate to the air-water plate heater's optimization and manufacture.
Abstract. The three-dimensional flow of high speed elevator is numerical simulated using the Computational Fluid Dynamics Method (CFD). The car of high speed elevator has dimensions of length 2.3m, width 1.7 m and height 2.4 m. The shape of diversion cover is conic. The flows of high speed elevator with different height diversion cover are simulated, and then the drags are analyzed. It is present that the drags of the car are decreased when the height of diversion cover increases.
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