Because disk friction loss of ultra-low specific speed centrifugal pump accounts for a large proportion of shaft power, it is important for accurate calculation of the loss. According to the structure of the pump and the characters of the flow of the fluid in the pump cavity, a new disk friction loss formula is put forward, which considers to add two important factors that include the leakage influence coefficient and geometric size of pump cavity. By means of CFD method, according to the results of numerical calculation prediction and test performance curve, the following conclusions are obtained by comparison of accuracy among the new formula and two existing disk friction loss formulas: the new formula is more suitable for calculation of ultra-low specific speed centrifugal pump disk friction loss compared with existing formulas.
With the development of intelligent manufacturing technology, 3D printing technology is also developing rapidly.This paper mainly studies the thermodynamic changes of different nozzle materials in FDM melt deposition technology of 3D printer at a certain temperature.ANSYS software is mainly used to simulate and compare the heating of copper nozzle and aluminum alloy nozzle. Through comparison, it is found that the deformation, i.e. thermal expansion of aluminum alloy material after heating is greater than that of copper alloy material.
Special shaped stone products have the characteristics of individuation, diversity and artistry, and are mainly produced in single piece and small batch, which requires its processing equipment to have flexible production capacity. Traditional manual processing and simple stone equipment can not meet the high-speed production needs of special-shaped stone products. According to the special process of special-shaped stone, the structural topology optimization calculation and analysis of beam rib plate structure is carried out by using MATLAB programming language, and the sand cleaning hole of beam are optimized and analyzed by using topological opt module in ANSYS, and a new beam structure is obtained. The analysis results show that compared with the original scheme, the new scheme not only reduces the weight, but also effectively improves the static and dynamic performance of the beam, achieves a good optimization effect, and lays a theoretical foundation for practical production.
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