The Experts below are selected from a list of 42 Experts worldwide ranked by ideXlab platform

Majid Bahramian - One of the best experts on this subject based on the ideXlab platform.

Ye Suisheng - One of the best experts on this subject based on the ideXlab platform.

  • Numerical analysis of the flow field uniformity in the Filter House of a nuclear air cleaning system
    Journal of Tsinghua University, 2000
    Co-Authors: Ye Suisheng
    Abstract:

    This paper introduces a methodology for simulating the flow field in a Filter House and theories for flow in porous media. The simulation results for different turbulence models and different characterictic valves of C for the porous material are compared and demonstrated. The Filters can be analyzed as porous media with C equal to 50 using the k e turbulence model so that simulations can be used to supplement experimental data. The simulation results showed that the non uniformity would be reduced by increasing the Filter House length. The minimum real Filter House length with 3 Filters whose flow uniformity meets the acceptance testing requirements is 6.9m.

Stefano Rossin - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Assessment of Fan-Ducting Coupling for Gas Turbine Ventilation Systems
    Volume 1: Aircraft Engine; Fans and Blowers; Marine, 2015
    Co-Authors: Alessandro Corsini, Giovanni Delibra, Stefano Minotti, Stefano Rossin
    Abstract:

    Gas turbines enclosures entail a high number of auxiliary systems which must be preserved from heat, ensuring therefore the long term operation of the internal instrumentation and of the data acquisition system. A dedicated ventilation system is designed to keep the enclosure environment sufficiently cool and dilute any gas coming from potential internal leakage to limiting explosion risks. These systems are equipped with axial fans, usually fed with air coming from the Filter House which provides air to the gas turbine combustion system, through dedicated Filters. The axial fans are embedded in a ducting system which discharges fresh air inside the enclosure where the gas turbine is Housed. As the operations of the gas turbine need to be guaranteed in the event of fan failure, a backup redundant system is located in a duct parallel to the main one. One of the main requirements of a ventilation fan is the reliability over the years as the gas turbine can be installed in remote areas or unmanned offshore platforms with limited accessibility for unplanned maintenance. For such reasons, the robustness of the ventilation system and a proper understanding of coupling phenomena with the axial fan is a key aspect to be addressed when designing a gas-turbine system. Here a numerical study of a ventilation system carried out with RANS and LES based methodologies will be presented where the presence of the fan is synthetized by means of static pressure discontinuity. Different operations of the fans are investigated by means of RANS in order to compare the different operating points, corresponding to 1) clean and 2) dirty Filters operations, 3) minimum and 4) maximum pressure at the discharge section. Large Eddy Simulations of the same duct were carried out in the maximum loading condition for the fan to investigate the unsteady response of the system and validate its correct arrangement. All the simulations were carried out using OpenFOAM, a finite volume open source code for CFD analysis, treating the Filters as a porous medium and the fan as a static pressure discontinuity according to the manufacturer’s characteristic curve. RANS modelling was based on the cubic k-ε model of Lien et al. while sub-grid scale modelling in LES was based on the 1 equation model of Davidson. Computations highlighted that the ventilation system was able to work in similarity for flow rates between 15 m3/s and 23.2 m3/s and that the flow conditions onto the fan suggest that the aerodynamic stress on the device could be reduced introducing in the duct flow straighteners or inlet guided vanes.

Sabah A. Abdul-wahab - One of the best experts on this subject based on the ideXlab platform.

D.s. Gidley - One of the best experts on this subject based on the ideXlab platform.

  • Site-specific air inlet systems for combustion turbines
    Diesel and Gas Turbine Worldwide, 1995
    Co-Authors: C.h. Goulding, D.s. Gidley
    Abstract:

    Each combustion turbine installation has peculiar to it site-related characteristics that, if considered carefully, will define the type of inlet system that best fits the turbine`s operational requirements. Turbine performance and component service life greatly depend on the ability of an air inlet system to reduce or eliminate contaminants entering the system. If these contaminants are not effectively removed, then fouling, erosion, and low- and high-temperature corrosion will occur. High-efficiency air filtration and low resistance is important from the initial start-up to the recommended Filter change out. Users and operators are fast coming to the conclusion that a single component/Filter House design cannot be used successfully for all geographic regions and for all gas turbine duties and specific site conditions. Additionally, any well-designed Filter House should provide an economical solution for initial cost, as well as continued operating cost, and through the use of modular design accommodate the addition of evaporative coolers and future upgrades in air Filter components. New high and ultra-high Filter efficiencies also have lower initial resistance and, when combined with a pleated panel preFilter, have the highest system dust holding capacity available today.