The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
It is generally accepted that the diesel engine crankshaft strength analysis is of importance in evaluating the performance and lifetime of the crankshaft and then acquire the overall engine mechanical information. However it is significant to apply a suitable model on the calculation including force analysis, simplification of the crankshaft geometry model, etc. In this paper, a single-cylinder crankshaft...
Cutting force is an important parameter in the design of bush reciprocating cutter. A reciprocating single blade cutting test equipment was made in this paper. Three factor and four-level complete test was done to study their influence on maximum cutting force. Three factors are sliding cutting angle, cutting edge angle, and crank speed. It was found that: the significant order of influence on maximum...
The anti-seismic analysis of large-scale underground caverns is always a difficult issue. When explicit dynamic finite element method(FEM) is adopted to perform time history analysis towards large-scale underground caverns, the consuming time is considerable and thus lowers the efficiency of project analyzes. To enhance the solving speed of explicit dynamic FEM, the hybrid method is presented based...
This paper researches on renewable energy proportion in the integrated energy, and proposes the development of renewable energy driving force to achieve the share target first. To the driving force, logic integration for industry chain and number integration for production and marketing have been done. Thus, the framework of renewable energy development can be reached. Based on this, the author puts...
In this paper, a simulation method will be introduced to solve the problem caused by the complicated and transient pressure, which is applied on the surface of turbomachinery blades. For the FSI (fluid-solid interaction) issues in turbo-machinery, this method can make the simulated results of the blades' deformation and stress more precise and closer to the real situation.
Shale borehole instability problem is the global and universal problem. There are lots of causes of Bore Hole Lost Stability; it included two aspects--------natural aspect and artificial aspect. To solve the borehole instability problem, mud chemic and sandstone mechanics was worked on. Sugeli gas field is one of the main area of Changqing Oil Field, its density limit of drilling fluid is narrow,...
Based on the two-fluid flow model combining by incorporating particle rotation with the kinetic theory of granular flow, Numerical analyses of effect of particle rotation on gas and particles flow behavior in a circulating fluidized bed(CFB) were performed. Results were compared between simulations without and with particle rotation. It was found that the particle concentrations were slight decreased...
An operation mode called hybrid sliding pressure operation mode, which considered the valve point and operation load together, was proposed in this paper based on the analysis and study of a large number of unit operation optimization methods. In addition, according to the steam-excited vibration occurred during the optimization process when the nozzle governing steam turbine switch single valve to...
Based on reference literature, this paper use DEA Malmquist technology to establish the total factor index model considered the variable returns to scale for evaluating carbon emissions performance and analyzed the results. And then, based on the STIRPAT equation, the paper used provincial panel data to test the main factors of carbon emissions performance in China. All the results showed that: In...
The blade aerodynamic performance of the NREL Phase VI rotor is studied using the full three dimensional Navier-Stokes equations and the κ-ω SST turbulence model under non-yawed condition at the wind speeds of 7m/s and 10m/s. Comparisons with NREL Phase VI experimental results are presented with respect to the pressure distributions, the normal force coefficients and the tangent force coefficients...
With the increase of coal demand, most coal fields in North China have developed their deep-seated coal seam, and it is important to have a full understanding of characteristics of the coal in deep seam. The coal petrology as well as the distribution characteristics of coal quality of the deep-seated coal seam in Wangfenggang mine field in Huainan area was studied in this paper. The influence exerted...
By experiment and computation, a radial impeller and a forward-skewed impeller are studied in interal flow filed. Detailed flow measurement and computation was performed at outlet flow field. The results show compared with radial rotor blade, the forward rotor blade can cause a spanwise redistribution of flow toward the blade mid-span and reduce tip loading. This results in reduced significantly total...
In cracked high arch dam aseismic stability analysis, the physical mathematic models based on continuous medium or broken loose medium is very distant apart from the actual situation. This article regards the dam and the cracked abutment rock mass as the nonlinear continuous mass which allowing local break and big distortion, and uses dynamic contact unit model to carry on the nonlinear numerical...
In this study, the gas-solid two-phase flow in a CFB riser was simulated by means of LES-DSMC method. The flow regime of descending clusters at the wall was characterized. The variations of their solid concentration, velocity during descending were studied. Meanwhile, the flow behaviors of particles within them were analyzed too. The results showed that clusters at the wall are dynamic collections...
A three-dimensional Euler-Lagrange model was used to study the distribution of particles in scrubbing-cooling chamber of coal-water-slurry (CWS) entrained-flow gasifier. Comparisons of computational results with experimental data are made. The effects of operating conditions and size grading on the particle number density distribution in chamber is revealed through simulation. The results indicate...
Oscillating Water Column (OWC) caisson breakwater is a type of wave energy converter which use caisson chamber as OWC air chamber, the paper first introduces concept design of the structure, and then a detail designed OWC caisson is given out. A random wave experiment is carried out in laboratory, an acrylic OWC caisson model is utilized, the first part is to get random wave force on the structure,...
In severe accident of nuclear plant, many non-or radioactive line particles are mainly PM10 (Particulate Matter10). Studying the PM10 thermophoretic deposition model can provide a theoretical basis for the design of advanced reactor. In this study, the diversification law of fine particles near-wall velocity in the temperature field of rectangular channel is studied using the two-phase experimental...
Rotor-coupling-rotor system of marine power plant will temporarily install on the rigid foundation for the delivery inspection, all the dynamic parameters are always satisfied with the design requirements; However, once it is installed on the real flexible foundation, rotor vibration of wide variable rotate speed get complicate because of the coupling between misalignment of isolator and dynamic meshing...
Airfoil geometric configuration is very important for aerodynamic performance of a straight-bladed vertical axis wind turbine (SB-VAWT). In recent study, Islam et al have pointed out old NACA-4 are not perfectly suited for SB-VAWT operating at low Reynolds number and special purpose airfoils is needed. Islam has singled out four required geometric features which would be suitable for SB-VAWT airfoil...
To achieve influence of underwater windmill's flow parameters and structure parameters-related changes with the hydrodynamic characteristics, an underwater windmill's additional contraction device is devised. According to the orthogonal experimental design, flow velocity, shrinking angle, locating range and outlet diameter are selected as four factors to carry out an L9 (34) orthogonal experiment...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.