The three-dimensional unsteady turbulent flow of rotational flow self-priming pump was simulated by using Reynolds time-averaged N-S equations and the standard k-ε turbulent model, sliding mesh model of static-dynamic coupled models and SIMPLE arithmetic. The static pressure distribution of the pump central rotative surface and relative velocity of the impeller central rotative surface in a complete application cycle were analyzed. The rule of instantaneous head in a impeller channel cycle was studied, and the positions of maximal head and minimal head were analyzed. It revealed that the unsteady method can truly simulate the changes of the rotational flow self-priming pump interior flow, and the unsteady characteristic of interior flow in rotational flow self-priming pump is obvious and it changes as the relative position of impeller and volute change. The change is periodical, and its frequency is relate to the impeller number and the rotate speed of the pump.
The structure and working principle are introduced in the paper. Based on the physical model of key parts to roto-jet pump which is set up in Gambit, the 3-D steady flows numerical simulation has been implemented by means of Fluent under design operating conditions. This method could avoid the error in simulating single part of the pump. The result shows the interflow distribution of the pump, the difference effect is very well after installing short blades on impeller. the shape of collecting pipe has little impact on the pressure within rotor cavity and the vertex band is apt to form in the corner of the collecting pipe inlet. By analyzing the energy losses between two different installed types of roto-jet pump. The result shows that the energy loss of rotor cavity in right-closed impeller pump is more than in the left-open impeller pump, but the effect of impeller pressurization in left-open impeller pump is not well, the energy loss caused by collecting pipe is almost the same in the two different pumps. The analyzing results can provide some proposals for structure reforming, performance and efficiency improving.
In recent years, civilbuilding photovoltaic system develops very soon in China. But it still in its infancystage and it is urgent to formulate and perfect the photovoltaic standardsystem for different climate zones and construction type. Aiming at thecharacteristics of northeast area of sunshine, we analyze the principle andmethod for photovoltaic system design of civil architecture, developed abuilding rooftop photovoltaic system in this paper. On building in the area ofelectrical system design, simulation of photovoltaic use PVSyst, and thephotovoltaic power generation system simulation results in northeast area ofbuilding roof is obtained.
In recent years, energy and environment problems are becoming more andmore serious, become people present and solve the energy crisis in the futurean important way of effective development and utilization of solar energy.Independent photovoltaic system is an important form of effective utilizationof solar energy. On the independent photovoltaic system research andoptimization design is of great significance for the effective use of solarenergy in the future. This paper takes Jilin Province Household independentphotovoltaic power generation system as an example, by using the design methodof the traditional formula and LOLP arithmetic design method are the design ofthe system, the simulation results of PVsyst analysis and comparison of thedata, obtained by LOLP arithmetic design in photovoltaic panels, power andstorage battery capacity is more reasonable, can to meet the needs of users ofthe premise, reduces the investment cost, improving the utilization rate of theequipment.
In this paper, the crack width and deflection of a local corroded reinforced concrete beam is investigated. The influence of the rebar corrosion on a concrete beam is analyzed first. Based on the constitutive relationship of the corroded reinforced concrete, the corroded reinforced concrete is regarded as a bond-slip composite beam which is comprised of corroded rebar and concrete. By using the large-scale finite element software ANSYS, a separate reinforced concrete beam model is developed after selecting the reasonable element. By using the proposed model, the positions of the cracks are determined. Moreover, the cracks width and the deflection of the beam at the corroded segment are calculated through using formula and extracting the results data from ANSYS. At last, the results by the standard design of concrete structures (GB50010-2010) and EN1992-1-1:2004[1] are compared through the list, which show the crack width and deflection of the local corroded reinforced concrete beams calculated by ANSYS is feasible.
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