Prefacedoi: 10.1088/1742-6596/2280/1/011001pmid: N/A
2022 the 6th International Conference on Fluid Mechanics and Industrial Applications (FMIA 2022) included original and peer-reviewed research papers and held on April 23-24, 2022 in Taiyuan, China. This conference was sponsored by Asian Union of Information Technology, and was attended by academicians, researchers, entrepreneurs, government agencies and policy-makers, postgraduates.FMIA is an annual international conference devoted to the discussion of recent developments and applications of parallel computing in the field of fluid mechanics, CFD, fluid power, fluid flow and related disciplines. The field of fluid mechanics is vast and covers numerous and diverse applications. The conference covered a wide range of topics, including basic formulations and their computer modelling as well as the relationship between experimental and analytical results. The meeting provided a forum for discussing new work on fluid mechanics and in particular for promoting the interchange of novel ideas and the presentations of the latest developments in this field. This conference would also provide an ideal environment to develop new collaborations and meet experts on the fundamentals, applications, and products of the mentioned fields.Committees are available in this pdf
Causes and troubleshooting of high bearing bush temperature of a nuclear power steam turbineLi, Shuaishuai; Qu, Tianzuo
doi: 10.1088/1742-6596/2280/1/012035pmid: N/A
As an important part of the steam turbine unit, once the temperature of the bearing bush rises abnormally, it will not only reduce the application performance of the bearing itself, but also affect the normal operation of the whole unit, resulting in shutdown accidents. Aiming at the problem of abnormal temperature rise of bearing bush of nuclear power steam turbine, combined with the operation and maintenance of the unit, the real cause of high bearing bush temperature is clarified, and then targeted treatment measures are taken to solve the problem, which is beneficial to ensure the safety of the unit.
Simulation Research on the Effect of Reynolds Number on the Aerodynamic Characteristics of High Lift DeviceZhao, Hui; Yang, Yueyue; Zhang, Yaobing; Li, Weibin
doi: 10.1088/1742-6596/2280/1/012010pmid: N/A
Based on the consideration of grid factors and turbulence model factors, the confluence boundary layer and aerodynamic characteristics of the NHLP-2D airfoil are studied. Compared with the experimental results, the grid distribution near the confluence boundary layer is important for calculating the width of the wake area. The calculation results of the structured and unstructured grids are basically the same when the surface grid distribution is the same. On the basis of the mesh refinement in the wake area, the aerodynamic characteristics calculated by the SA turbulence model and the distribution of the total pressure coefficient in the confluence boundary layer are in good agreement with the experimental results. The width of the confluence boundary layer and the wake strength decrease with the increase of Reynolds number, the lift coefficient increases with the increase of Reynolds number, but the drag and pitching moment have opposite pattern. The maximum lift of the airfoil increases as the Reynolds number increases. As the Reynolds number increases, the stall angle of attack of the airfoil gradually increases and then remains stable with the increase of the Reynolds number.
Control of Inner Flow Field Inside A Transonic Centrifugal Compressor with Splitter Through Chordwise SweepLiang, Dong; Chen, Huixin; Ou, Jun; Jin, Donghai; Gui, Xingmin
doi: 10.1088/1742-6596/2280/1/012006pmid: N/A
The strategy of sweep design should be based on the inner flow field of the compressor. In this paper, a transonic centrifugal compressor within the splitter is discussed in detail, and both forward sweep and backward sweep are studied with numerical simulation for optimization. Splitter introduces extra leakage and it’s worth noting that the high-entropy region is shifted from the suction side of the main blade to the suction side of the splitter. Different from the transonic axial rotor, the leakage of the main blade mainly occurs after the passage shock and will be mixed with the leakage of the splitter in the suction side of the splitter. Therefore, the flow control on the middle and rare part of the compressor is more essential for the performance of the stage. In this regard, the backward sweep of the main blade exhibits a good effect by reducing the mixing loss of secondary leakage. Due to the redistribution of the airflow, the mainstream velocity in the tip area is accelerated in the forepart and reduced in the rare part, the aerodynamic loss in the high-entropy zone is then improved, and the flow capacity of the compressor is also increased. The best performance is achieved by an 8° backward sweep for the centrifugal compressor in this work, the pressure ratio is increased by 2.84% and isentropic efficiency is increased by 1.40%, compared to the prototype.
Numerical simulation of saturated oil process based on digital pore modelLiu, Haibo
doi: 10.1088/1742-6596/2280/1/012053pmid: N/A
In order to study the saturated oil process in the digital pore model, numerical simulations are performed by building a model. The results show that the direction of the capillary force is judged according to whether there is an odd or even number of fluid segments in the throat, and the odd segments cancel each other out, while the even segments have a capillary force; Three cases need to be considered when calculating the drag coefficient: (1) only single-phase fluid exists in the throat; (2) the corner of the throat is in the wetted phase, while the center of the throat is in the non-wetted phase; (3) the corner is in the wetted phase and the center of the throat is a multi-phase fluid. After performing saturated oil simulation calculations, the digital pore model can visualize the saturated oil process and results, which is realistic, fast, accurate and low cost, and is of great significance to the subsequent research on efficient reservoir development methods.
Design and analysis of a new heavy oil pump based on CFDSun, Yi; Meng, Fanxiang; Pan, Lichao; Wang, Xu
doi: 10.1088/1742-6596/2280/1/012040pmid: N/A
At present, submersible electric pump is the main oil production equipment in the world’s oil fields. Because the pump is tested with clean water as the medium when it leaves the factory, it can not be widely used in all oil fields. In this paper, a prototype submersible electric pump is improved and designed according to the actual working conditions, and a new heavy oil pump is obtained, which can be widely used in heavy oil Wells. The static pressure distribution and velocity vector distribution under the actual working conditions were simulated by CFD, and the feasibility was verified. It provides theoretical basis and technical guidance for solving the adverse effect of high viscosity produced liquid on pump, and has certain guiding significance for oilfield pump selection. So as to effectively save electricity and rationally exploit energy.
Experimental Study on Fluid Elastic Instability of Concentric Circular Arrangement Heat Exchanger TubesLiu, Mengmeng; Zhang, Donghui; Song, Guangdong
doi: 10.1088/1742-6596/2280/1/012054pmid: N/A
In the industrial production, there exists the phenomenon of structure vibration caused by flow, which will cause the deformation and failure of the structure and lead to the economic loss, and even cause the industrial accident and great danger. In this paper, the one mechanism of fluid-induced vibration, namely fluid elastic instability, of the concentric circle arrangement tube bundles in the sodium-sodium heat exchanger is studied experimentally. According to different central angle positions, three kinds of tubular plates are designed, which are approximately triangle arrangement, approximately square arrangement and transitional arrangement respectively. In the small-size water tunnel non-contact graphic measurement is adopted to obtain the critical flow rate Ucr when the tube bundle is unstable. The experimental results show that the flow induced vibration resistance of the transitional arrangement is better, and the critical flow velocity is about 3.78.
The axial fan design and commissioning test with nonuniform inlet flowQu, Xiaoli; Ren, Zebin; Yang, Wenguo; Luo, Yuanqiang
doi: 10.1088/1742-6596/2280/1/012026pmid: N/A
According to the two-dimensional flow theory of the axial fan rotor blades and the aerodynamic characteristics of the low speed wind tunnel, combined with the fan aerodynamic efficiency and wind tunnel pressure loss coefficient, a new equation which points out the inherent relationship of the fan blade setting angle, fan rotating speed and flow rate in wind tunnel circuit is derived. So a new method for fan rotor blade setting angle adjustment to satisfy the fan performance at off-design point by getting the test results of fan operating parameters but without the fan total pressure rise in the low speed wind tunnel is developed. Following the new method, the fan rotor blade setting angle adjusting value was provided directly only with the fan rotating speed and flow velocity in the wind tunnel test section, the adjusting target was achieved successfully by the new blade setting angle, the cost of the wind tunnel commissioning test were saved. The test results show that, after increasing the fan rotor blade setting angle by 4.5 degrees, when the flow velocity in the wind tunnel test section reaches 60m/s, the fan rotating speed is 570rpm, the deviation from the predicted fan rotating speed value of 575rpm is 0.9%. For the same test section flow velocity, the predicted value and the real value of the fan rotating speed are in good agreement, it proves that this method is reliable and accurate in practical application.
Study on the flow around a cylinder by candle flameHuang, Junwei; Zhang, Pengyu; Xie, Zhuoxuan; Zhao, Haojie; Xu, Chenkun; Chi, Jing; Lu, Huiping
doi: 10.1088/1742-6596/2280/1/012043pmid: N/A
Interferometric measurement, schlieren method and shadow graph are commonly used to observe the low-speed steady flow. It is difficult to directly observe the flow direction in the experiment of flow around a cylinder at medium and high Reynolds number. On this premise, this paper mainly studies the relationship between the movement state of candle flame and the direction of candle airflow. This paper studies the influence of different wind speeds on the flow around a circular cylinder at medium and high Reynolds numbers. The innovation of this paper is to propose a new idea to directly observe the complex air flow, and to compare the candle flame state under different experimental conditions and the calculation images of different turbulence models.