Based on China Supercritical-Water-Cooled Reactor 1000 (CSR1000) research project, this paper introduces the general design research progress and the structure design scheme of the two-pass reactor, of which the key technologies are studied or proposed, including reactor structure material, sealing type, flow distribution, thermal stress analysis and flow-induced vibration response analysis. Basic research methods and solutions are provided, which are meaningful for the engineering practice.

Ship manoeuvrability has a close relationship with navigation safety. For a ship sailing in the proximity of a pier, its manoeuvrability is different from that in unrestricted waters. To predict the ship manoeuvrability in the proximity of a pier, the method of simulation based on mathematical model is used. The mathematical model of ship manoeuvring is obtained by using Support Vector Machines (SVM) based system identification, combined with free-running model tests. The interaction between the pier and the ship are considered in the mathematical model of ship manoeuvring motion. By analyzing the test results, SVM is applied to identify the hydrodynamic coefficients and the interaction coefficients in the mathematical model. By using the regressive models, the ship manoeuvring motions in the proximity of a pier are predicted. Comparisons between the predicted results and the test results demonstrate the validity of the proposed SVM method. Identification results, model test results as well, also confirm that navigation safety of the ship in the proximity of a pier can be guaranteed if the distance between the pier and the ship is under control.

In order to develop high efficiency and high head deep well pump of 150QJ20 type, a L 18 (3 7 ) orthogonal experiment was performed with seven factors and three values including blades numbers, outlet angle, outlet width, etc.18 impellers were designed. The whole flow field of new-type two-stage deep well pump at the operating point for design was simulated by FLUENT using the standard model, SIMPLEC algorithm, second-order upwind scheme to solve, and analyze the independent of the number of the grid. 18 groups of the efficiency and head in design scheme were obtained. The effects of geometrical parameters on efficiency, head were researched using Latin square test method. The primary and secondary factors of the design parameters were acquired by way of variance analysis. According to the test result, an optimum program to further design was put forward. After manufactured and tested, the final optimal design model pump flow at rated efficiency of 66.59% point, single-stage head of 10.9m, match the motor as 5.5 kW, compared to the Chinese national standards (GB/T 2816-2002), which the rated flow point of the efficiency of 64% and matching motor 7.5 kW, the efficiency and head were significantly improved. The productions show good energy saving and material saving characters and can replace traditional pumps for deep well in the future, the comprehensive technical indicators achieve international advanced levels. The results would be instructive to the design of new-type deep well pump with the impeller head maximum approach.

In this presentation, we will demonstrate fast and electroless UV-photo activation techniques to synthesize electrically conductive metals (Pd), semiconductors (CdS), and alloy (Au-Ag) nanowires of diameter ∼10–180 nm on DNA. The electrical characterization showed that DNA nanowires are either exhibiting Ohmic or semiconducting behavior having low contact resistance with the electrodes. The nanowires are about 1–10 micrometers long and the length depends on the molecular weight of DNA. Highly selective deposition on DNA is obtained by specific complexation between the metal ions and DNA, followed by the growth of nanoclusters in DNA chain to form the corresponding nanowires. The eventual diameter of the nanowires obtained in our experiments is over 10 nm that is significantly larger than the ∼1–2 nm diameter of the double helix DNA. The DNA nanowires orchestrated with semiconducting Si nanowires, carbon nanotubes, or co-deposited with metal nanoparticles can potentially lead to avenues for making complex single electron devices and Schottky nanodevices.

The centrifugal compressor impeller plays a significant role in the micro gas turbine. Its aerodynamic performance and structural reliability has great impact on the gas turbine system. Its aerodynamic performance and structural reliability are determined by blade design parameters and impeller back face design parameters. This paper presents a process of optimizing a centrifugal compressor impeller during the development of 100kW class micro gas turbine. Predicted by a 3D Navier-Stokes solver the aerodynamic performance is mainly affected by meridian contour and blade angle β distribution. The stress is calculated by means of a finite element analysis method and controlled by blade angle β distribution and thickness distribution at the hub. The requirement of high efficiency is met by using genetic algorithm and artificial neural network. Then the impeller back face profile is parameterized and optimized to decrease the stress of the impeller. The isentropic efficiency of the compressor is increased by 1% and the blade stress is reduced by 10% as compared with the original design. The results show that it is possible to reduce the centrifugal stress in the impeller without penalizing the aerodynamic performance through the optimization method.

Submersible pump for deep well, widely used in the countryside, mines, geothermal utilization and so on, are the main equipment for pumping underground water. Due to the working conditions, the pump diameter is limited by the well diameter, and the single-stage head designed by traditional methods is low. In order to increase the single-stage head, the maximum diameter design method of impeller was created for the first time. The impeller front shroud diameter is almost equal to the inner casing diameter, and the back shroud diameter is almost the average of the impeller front shroud diameter and the guide vane shroud diameter. The blade extends to the impeller inlet to lengthen the back shroud streamline, which could prevent the back flow at the impeller outlet, and the front shroud is designed in a cone shape to make the outlet streamline upward, by which the pump efficiency increases. A new return guide vane with twisted inlet and 3D curved surface was designed to reduce the cost, and the hydraulic loss. The self-balancing design method of impeller axial thrust was accomplished by using the end-face seal at the impeller inlet and adopting the sliding fit between the pump shaft and impeller; the impeller axial thrust is self-balanced because the areas of the impeller front shroud and back shroud are almost equal. The interior flow was simulated based on Fluent RANS CFD, both numerical simulation and test results showed that the performance of the new type well pump was better than the traditional products. A series of submersible pumps for deep well were designed, manufactured and tested, compared to the similar products at market home and abroad, the single-stage head increases 20% to 50%, the efficiency increases 3% to 9%, and the whole axial length and weight decreases around 1/3.

In this paper, the dynamic model of the gearbox transmission for the wind turbine is proposed. The influence factor method is used to derive of the system’s dynamic equations, the natural characteristics of the transmission are obtained and the results are discussed. Finally, the influence of basic parts’ moment inertia on the natural characteristic is analyzed.

Micro gas turbines are becoming popular for the distributed electric generator and propulsion system of small air vehicles. The centrifugal compressor impeller is an important component in the micro gas turbine and its aerodynamic performance and structural reliability have great effects on the system. This paper studied the impeller deformation caused by the thermal load (temperature variation) and mechanical loads (aerodynamic pressure and centrifugal force) and its influence on the impeller aerodynamic performance. Combined computational fluid dynamics (CFD) flow analysis and finite element method (FEM) structure analysis, using the fluid-solid and heat-solid interaction technology, the aerodynamic and temperature effects were transferred on the solid blade surfaces as loads to analyze the strain and stress of the centrifugal blade. The working blade profile was achieved by calculating the deformation magnitude of the solid grid nodes. The research showed that the largest deformation occurred at the blade inducer tip and the variation of tip clearance caused by blade deformation brought some influence not only on the aerodynamic performance but also on the structure reliability of the impeller. In order to reduce the impeller deformation under working condition, the hub section profile of the impeller was redesigned by an optimization method.