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In order to make the location of separation point of the boundary layer of the air flow measurements easier and more accurate, a very small sensor array has been constructed. MEMS play an important role for studying gaseous or liquid fluid flows experimentally due to device dimensions on the μm-scale. Based on the well-established principle of thermal anemometry, an array of hot-film anemometers on...
A new cross flow solid-liquid separate equipment with high efficiency has been proposed, and comparative experiment investigations between the municipal sewage plant and the test device of the separator and the numerical simulation of the device flow field using FLUENT CFD software have been combined to define its basic operating parameters and precipitation characteristics, and has laid the foundation...
As a kind of high-efficient separation equipment, hydrocyclone has been widely used. In order to improve its performance, the structures of different parts have been optimized in recent years. Especially for the inlet structures, they play an important role in internal flow field and separation efficiency. So in this paper, two kinds of hydrocyclones with typical inlets - axial-flow hydrocyclone and...
A method moving vehicle noise simulation was given. Geometric model of a sedan car is built using Pro/E. Analytical model was built by meshing using GAMBIT. FLUENT was applied to solve the steady simulation using RANS method. The noise source distribution of the vehicle surface is predicted based on the Broadband Noise Source Model. The unsteady simulation is solved using LES method. The far-field...
Flow separation should be controlled to improve performance for its adverseness in flow field. The separation flow in complex three-dimension viscous fluid with rotation effects in hydrodynamic coupling is analyzed. The method of drilling holes in turbine vane is employed to control flow separation in hydrodynamic coupling. The 3D flow field before and after drilling in turbine vanes is simulated...
In view of the hydraulic transient problem in heated liquid pipeline with entrapped gas, water hammer analysis equations are built. The solve methods are discussed based on homogeneous flow model and fractional flow model. Then VC++ is utilized to develop a computer program to simulate the hydraulic transient behavior. Ultimately, this paper simulates the hydraulic transient behavior on the conditions...
Numerical simulations of a flue gas turbine were conducted by using the software NUMECA. The influence of different moving blade installation angles was analyzed on the internal flow field, and the change of turbine's efficiency and mass flow rate was studied too. It is found that moving blade installation angle has great influences on turbine's performance. The results indicate that the optimal installation...
Three-dimensional numerical simulations were performed to study the internal flow of a mixed-flow pump impeller under design conditions, by using commercial CFD software - NUMECA, specifically developed for the flow analysis of turbo-machinery. The agreement between the calculated results and the experimental data proved that the adopted numerical methods and models were reasonable and accurate. By...
The lack of understanding of most of the relevant physical mechanisms when applying flow control limits the prospects of successfully transitioning flow-control technologies into real flight vehicles. Successful control of boundary-layer separation for lifting surfaces promises major performance gains especially when large laminar runs are desired in order to minimize the skin-friction drag. We systematically...
Measurements and simulations of cold gas flows in Gas Circuit Breakers (GCB) geometries were done. The found flow patterns are related to the dielectric performance during a switching operation. A reference experiment was designed with direct pressure measurements at several positions in the nozzle-diffuser system and on the edge of the plug tip. The results show the development of minimum density...
One of the remaining challenges involved in modern naval ship design and analysis is to account for the effects of breaking waves, spray and air entrainment on the performance and non-acoustical signature of a surface ship. The near field flow about a surface ship is characterized by complex physical processes such as: (i) spray sheet and jet formation; (ii) strong free-surface turbulence interactions...
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