As an efficient, environmental and energy-saving transportation technology, the wheeled capsule transportation has promising application prospects. When the pipeline carriage was stationary in the pipe, it could be regarded as a crossing-cylinder structure. When water flowed around the structure, the vortices existed, which would cause energy loss. Therefore, the hydraulic characteristics at the downstream of the flow field around a pipeline car and the spatial vortices structure after the stabilized flow field were studied by numerical simulation, model test and theoretical analysis. The results show that the near-field areas of the downstream flow field of wheeled capsule with different diameters could be divided into the reflux zone and the jet zone. As the distance rose, the section-averaged velocity had a tendency of declining then rising in the near-field, and recovered the section-averaged velocity of pipe at the distance of the length of capsule. And in far-field, with the distance rose, the fluctuation of section-averaged velocity was gradually decreased, and the flow became stable. The eddy ring structures in the field were highly fractured, eddy structures were more on the side near the annular gap and less on the side near the pipe axis.

As a large steel structure in the open environment, the miter gate will form a non-uniform time-varying temperature field under the solar radiation, resulting in complex temperature effect on the structure. If not paid attention to the project, it may lead to safety problems such as weld cracking and structure instability. The temperature field of the structure was analyzed by changing the surface coating and using finite element software. The results show that under solar radiation, the gate panel and the top beam form a multi-temperature area array distribution of temperature field, and the beam system temperature distribution is relatively uniform. The surface coating has great influence on the temperature field of the gate. The coating with low radiation absorption rate can reduce the temperature rise of the gate components, and the maximum temperature can be reduced by about 25%. The distribution of temperature field is greatly improved, which can effectively prevent local stress concentration or excessive deformation in the stress field and deformation field of the gate.

Taking the mixed-flow pump turbine as the research object, a fully elliptical volute was designed, which could meet the working conditions of the turbine and the pump. The ratio of the length and short half axis of the elliptical section of the volute was guaranteed to be fixed. The worm shell was designed by its outlet circumferential velocity and the circumferential velocity moment of each section, and the relationship between the size and flow rate of each section of the volute was given. Through CFD numerical simulation, the variation law of the circumferential velocity of the volute outlet and the circumferential velocity moment of each section was obtained. The distribution law of the velocity and pressure inside the volute was summarized, and the simulation results meet the design requirements, which has high practical application value.

In order to study the mechanical properties and damage mechanism of recycled brick concrete, the shape of recycled aggregate was regarded as a random concave convex polygon. Recycled brick concrete was regarded as seven-phase heterogeneous composite materials such as waste brick aggregate, waste concrete aggregate, new and old mortar, waste brick-new mortar, aggregate-old mortar, new and old mortar. Based on the ABAQUS development program of PYTHON, the numerical model of recycled concrete with different aggregate rate and different brick quantity was established. The meso-mechanical properties of recycled concrete containing brick with 45% coarse aggregate content were analyzed. The damage and failure patterns of recycled concrete containing bricks under load were studied. The results show that the algorithm is efficient in modeling, and can establish the mesoscopic model of recycled concrete containing bricks with different aggregate rates and different brick quantities, which can meet certain engineering requirements; The peak stress and elastic modulus of recycled brick concrete gradually decrease with the increase of brick quantity, while the peak strain increases with the increase of brick quantity; The damage and failure patterns of concrete with different brick quantities are basically the same.

Taking a reconstruction canal section in Zuncun Irrigation District as the research object, this paper studied the sediment transport characteristics and scouring and silting change law of the canal. The causes of channel siltation were analyzed by sampling suspended matter, bed sand and measured velocity. The results show that the most serious siltation occurs at the head of the canal, and the siltation during the water shut-down period is an important factor causing the siltation of the canal. The flow rate of sediment carrying under each water conveyance condition is given, which provides the basis for the reduction of siltation and the efficient operation of the irrigation area in the future.

In order to solve the current situation that hydraulic turbine fault diagnosis relies excessively on expert experience and has low efficiency, the historical data of hydraulic turbine fault and relevant expert experience were used to establish the fault tree model for seeking the mapping between risk hidden danger and fault diagnosis. Through the conversion of fault tree model and Bayesian network model, the probability importance and sensitivity of root node were deeply studied by using the reverse diagnosis technology of Bayesian network. Hydraulic turbine components and fault causes were inferred to realize the fault diagnosis.

The flow channel model and the shafting model of the turbine unit were established, and the fluid-solid coupling method was used to analyze the dynamic characteristics of the shafting system vibration of turbine unit induced by hydraulic factors under the steady-state conditions with different loads. The measured data were compared to verify the feasibility of the method. And then the correlation mechanism between the vibration characteristics and the internal flow characteristics under typical steady-state conditions was studied. The results show that the vibration characteristics of the guide bearing obtained by this method are basically consistent with the experimental values, and the trend of vibration changes with the change of load is consistent. Due to the positional relationship, the vibration characteristics of the water guide bearing and the upper guide bearing have a certain amplitude difference. The horizontal vibration amplitude of the unit is the largest due to the obvious vortex belt in the draft tube when running at 75% load condition. The research results can provide a scientific reference for the stable operation of hydropower turbine units under different loads.

In order to solve the problem of benefit sharing amount, a quantitative model was established, and a case study was conducted on the application of the model and the corresponding benefit distribution ideas. The results indicate that the stakeholders of hydropower development projects mainly include the central government, local governments, hydropower enterprises and reservoir immigrants, and the net present value method can be used to construct the benefit sharing model, in which the stakeholders take the product of the sum of the present value of net cash flows of hydropower projects and their input shares as the sharing amount. The grey prediction method was used to solve the model. The case of Xiluodu Hydropower Station proves its rationality. It is suggested to establish a development fund for immigrants and safeguard the interests of other parties to open up a new situation of co-construction and win-win of hydropower development.

A turbine runner of a certain power station often produces cracks due to excessive blade stress, which threat to the safe operation of the unit seriously. To solve the problem of the turbine runner blade stress, based on RNGk- ε turbulence model, the modeling and mesh of turbine components were carried out for a bulb tubular turbine. Through the runner blade thickening and angle optimization, CFD technology was used to optimize runner hydraulic performance and strength comparative analysis. The results show that the stress and deformation of the optimized runner blade are greatly improved, which meets the actual engineering needs and can effectively avoid the generation of runner cracks.

Based on the RNG Κ-ε double-equation turbulence model and the VOF two-phase flow model, the flow regime, flow velocity, pressure, energy dissipation, cavitation and sediment transport characteristics of the double volute chamber vortex shaft were studied using model test and numerical simulation. The results were in good agreement with the experimental values. The vortex chamber was more thoroughly dosed with gas through an aerator device, which reduced the possibility of cavitation erosion. The measured energy dissipation rate exceeded 75%, indicating a good energy dissipation effect. The sediment siltation existed at the bottom of the shaft for various particle sizes at various flow rates, reducing the depth of the stilling well. At low flow operation, the siltation might reached up to 72% of the stilling well’s depth. However, the sediment was cleared away after a big flood and the silt height was lowered to 1.6% of the well depth, enabling the cyclone shaft to have a sufficient water cushion for energy dissipation that would not interfere with its regular functioning. Control the size of the barrage in actual projects to prevent congestion caused by large particles of sediment entering the floodway. In actuality, the operating mode can be altered to control the stilling well’s silting height, ensuring that it has sufficient rich water cushion depth to match the cyclone shaft's design and regular operation requirements.