Abstract: A study on the flow and separation performance of supersonic gas separator is carried out through numerical simulation and experimentation. The effect of area ratio on the separation performance under low pressure ratio has been researched. The simulation results indicate that with an increase of the area ratio AR, the intensity of the shockwave increases and the location approaches the throat; Shockwaves are absent in the diverging section of the nozzle when area ratio is 1.063 and the pressure ratio is within 1.25-1.75, which reaches the highest separation performance. The calculated and experimental results also show that the separation performance is the highest and can reach 40.82% when pressure ratio is 1.75. The calculated values are in agreement with the experimental results.
Abstract: With the the development of super-high pressure technology such as the super-high biological treatment processing, the wire-wound prestressed vessel was widely used as the main pressure bearing structure. It’s proved that the stress was well-distributed along thickness direction and the carrying capacity was improved comparing with traditional pressure vessel. But the deign of wire-wound pressured vessel so far only checks out the fatigue strength margin of winding wire according to the design theory, and lacking of fatigue design of inner cylinder could causes potential safety hazard. So a stress analysis was carried out for prestressed wire-wound vessel with the help of ANSYS, and the fatigue life of the whole prestressed vessel was validated by means of theoretical calculation and the Fatigue Tool .
Abstract: As an emerging industry, ultra-high biological processing technology enjoys great potential and vast development prospects. Design and manufacture of the pressure equipment has always been a core problem because of ultra-high pressure processing environment. The finite element analysis software ANSYS is used to analyses the working stress distribution and deformation of a combined self-sealing structure according to an ultra-high pressure vessel. The sealing situation is evaluated and the dangerous position of axial seal is calculated which has a certain guiding significance on optimal structure design of container end seal in the future.
Abstract: In order to study reasonable structure of rectangular tapered header, the methed of computatation fluid dynamic was used to research pulp distribution characteristic of the rectangularly tapered pulp distributor and to optimize its structure. The results show that velocity distribution and pressure distribution in the tapered header were not uniform and the mass flow rate out of branch pipes was obviously accrescent from inlet of header to outlet of header. There was remarkable deviation comparison to expected value of mass flow rate. The real backwall shape of the rectangularly tapered head was a complicated curve that was obviously different to the simplified header at area of the inlet and the outlet. The pressure distribution in the optimally designed header was more uniform and the pressure curve at the location corresponding to branch pipes was nearly a horizontal line. The mass flow rate distribution out of the branch pipes was more uniform else and was close to the expected value curve. The deviation of the mass flow rate in every branch pipe was less than 1%.
Abstract: Taking a certain urban model of electric vehicle as example, DC04 steel plate has replaced with high-strength steel plate BH340 for some parts of the car body on the purpose of reducing the car weight; at the same time, reduced the thickness of steel plate at the replacing spots, and then set the finite element model for the car body to compare its bending rigidities before and after replacement. On the premise of satisfying car body’s bending rigidity, it could make car body to reduce a weight of 23.2KG to satisfy the requirement for lightweight design.
Abstract: According to the lower shaft structure feature of a pneumatic and mechanical agitation flotation machine in the practical application, a finite element model is established on the basis of modality analytical theory of vibration structure. Through analyzing the modality characteristics of the lower shaft, the vibration mode of lower shaft is obtained. Moreover, through analyzing the modal characteristics of the lower shaft in condition of different impellers material and lower hollow shaft wall thickness, the conclusion is obtained that more lighter the impeller’ material is, more great the difference between natural frequencies and vibration excitation frequencies is. Another conclusion is that the lower shaft still do not resonate when the wall thickness of lower shaft thin appropriately. The conclusions of this paper have great theoretical and practical significance of further optimization of the flotation machine lower shaft structure.
Abstract: The success of 200m3 and 300m3 flotation cell in industrial application calls for matching conditioner. Experimental research in Ф6.5m conditioner is taken to select suitable impeller and rotating speed. 4PB impeller and 4HB impeller are compared in flow features and power consumption in single phase flow. The conclusion that the power consumption per cycle-volume by 4HB impeller is 80% of that by 4PB impeller is drawn. 4PB impeller and 4HB impeller are compared in suspension characteristics in double-phase flow. The conclusion that 4HB impeller can suspense the mineral by lower power consumption while 4PB impeller cannot under the same situation is drawn. Thus 4HB impeller is prior to be used in large pulp conditioner. Based on this experiment, many large pulp conditioners are successfully applied
Abstract: BF type flotation machine is a kind of self-air & slurry suction flotation machine. In this paper, several key flotation kinetic parameters of BF-40 flotation machine are introduced, and the relationships of impeller rotating speed, impeller immersion depth, air suction amount, power consumption and air dispersion are studied by water test. Best test result is obtained on the condition of main shaft rotating speed of 151r/min, impeller immersion depth of 1195mm, which provides theory basis for the equipment industrialization.
Abstract: The structure of the sensor endurance test station is designed. Satisfied with the request of the performance, structural parameters of the spindle and bearing are calculated to minimize the spindle mass using optimization theory. By the static analysis, fatigue analysis and frequency analysis of spindle and bearing using the FEM, the simulation results indicate that the optimized structures can meet the demands for the strength and dynamics of the flywheel system, which leads to safe and stable work, improve design efficiency effectively, shorten design cycles, and reduce production costs. In order to reduce the eccentric force of inertia and intensity of the vibration source, the need for computing unbalance spindle, and a mechanism for balancing, allowed reaching equilibrium precision. After commissioning test station, running at high speed working in good condition, system run more smoothly, to meet the requirements.