GT2008-51068 IMPROVEMENT OF PERFORMANCE PREDICTION BY AUTOMATED ASSIMILATION OF GAS TURBINE COMPONENT MAPS

ABSTRACT The performance data of most Siemens heavy-duty gas turbines which have been built in the last 20 years are stored in so-called typefiles. These typefiles contain the description of the thermodynamic operating behavior for each gas turbine type using several component maps, e.g., for the compressor, the turbine and the combustion chamber. In addition to all available high-accuracy performance test results, modern IT technology enables the user to handle a tremendous volume of measured data via remote access. This allows the user to determine and to guarantee the performance of modifications and upgrades with sufficient precision, even for older gas turbine types. The method for automated generation of typefiles based on the entire volume of available data and its corresponding Matlab ® based software solution are the focus of this contribution. Although this method offers a very promising source of data from various sites, the obtainable data sets usually do not cover the entire temperature and rotational speed range that is necessary to create a map suitable for all requisite operating conditions. Thus, theoretically-based additional information combined with special extrapolation methods are necessary

Comparison of Periodic Flow Fields in a Radial Pump among CFD, PIV, and LDV Results

The interaction between the impeller and the diffuser is considered to have a strong influence on the unsteady flow in radial pumps. In this paper, the unsteady flow in a low specific speed radial diffuser pump has been simulated by the CFD code CFX-10. Both Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) measurements have been conducted to validate the CFD results. Both the phase-averaged velocity fields and the turbulence fields obtained from different methods are presented and compared, in order to enhance the understanding of the unsteady flow caused by the relative motion between the rotating impeller and the stationary diffuser. The comparison of the results shows that PIV and LDV give nearly the same phase-averaged velocity fields, but LDV predicts the turbulence much clearer and better than PIV. CFD underestimates the turbulence level in the whole region compared with PIV and LDV but gives the same trend

Parametric study of a novel groove design for dry gas seals

This paper presents a performance analysis of a novel bidirectional groove design for dry gas seals. The scope of analysis includes the impact of important groove design parameters on the dry gas seal performance. The leakage flow and the axial stiffness and damping force coefficients are taken into account for performance assessment. For varying geometry the pressure field in the lubrication gap of the application is estimated. Based on these pressure fields the performance parameters are calculated. The utilized method to predict the fluid flow through the lubrication gap is founded on the Reynolds theory of lubrication. This two dimensional approach is based on the assumptions of a laminar viscous flow field with isothermal conditions and takes aerostatic as well as aerodynamic effects into account. The 2D approach is solved by a finite difference approximation. The aim of the contribution is to recommend geometrical parameters to ensure large static stiffness and damping force coefficients while still allowing for low seal leakage rates.Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016

InVEST SWYM monthly and annual quickflow and baseflow values

This database incorporates information of modeled quickflow and baseflow values for 224 catchments in southern Chile, as well as observed streamflow values for the same catchments. The catchments ID is the same as the used by official government water regualting institutions and has being used by other large hydrological databases (Alvarez-Garreton et al., 2018) The InVEST seasonal water yield model was used to obtain quickflow and baseflow estimations, while streamflow values were retreived from a local database (Alvarez-Garreton et al., 2018). This database can be used to assess particular watersheds, to re-evaluate values using newest input modeling data, to develop sensitivity analyses for each of the watersheds. References: Alvarez-Garreton, C., Mendoza, P.A., Boisier, J.P., Addor, N., Galleguillos, M., Zambrano-Bigiarini, M., Lara, A., Puelma, C., Cortes, G., Garreaud, R., McPhee, J., Ayala, A., 2018. The CAMELS-CL dataset: catchment attributes and meteorology for large sample studies – Chile dataset. Hydrol. Earth Syst. Sci. Discuss. 1–40. https://doi.org/10.5194/hess-2018-2

General land use and Ecosystem Services supply data for Panguipulli and Ancud Municipalities

The dataset provides raw data on land uses (native forest and pastures) and ecosystem services supply (forage supply, water regulation and recreation opportunities) per farm property for two municipalities in southern Chile; Panguipulli (n=2831) and Ancud (n=2853). For each farm unit, the total supply and the mean supply of ES is provided, along with other land use metrics as total native forest and pastures, as well as their respective proportions (pecentage). For Ancud municipality data is provided for each farm unit whereas for Panguipulli not every farm unit contains land use and ecosystem service data. However, it is clearly indicated which data is available for each farm unit

General land use and Ecosystem Services supply data for Panguipulli and Ancud Municipalities

The dataset provides raw data on land uses (native forest and pastures) and ecosystem services supply per farm property for two municipalities in southern Chile; Panguipulli (n=2831) and Ancud (n=2853). For each farm unit, the total supply and the mean supply of ES is provided, along with other land use metrics as total native forest and pastures, as well as their respective proportions (pecentage). For Ancud municipality data is provided for each farm unit whereas for Panguipulli not every farm unit contains land use and ecosystem service data. However, it is clearly indicated which data is available for each farm unit

InVEST SWYM monthly and annual quickflow and baseflow values

This database incorporates information of modeled quickflow and baseflow values for 224 catchments in southern Chile, as well as observed streamflow values for the same catchments. The catchments ID is the same as the used by official government water regualting institutions and has being used by other large hydrological databases (Alvarez-Garreton et al., 2018) The InVEST seasonal water yield model was used to obtain quickflow and baseflow estimations, while streamflow values were retreived from a local database (Alvarez-Garreton et al., 2018). This database can be used to assess particular watersheds, to re-evaluate values using newest input modeling data, to develop sensitivity analyses for each of the watersheds. References: Alvarez-Garreton, C., Mendoza, P.A., Boisier, J.P., Addor, N., Galleguillos, M., Zambrano-Bigiarini, M., Lara, A., Puelma, C., Cortes, G., Garreaud, R., McPhee, J., Ayala, A., 2018. The CAMELS-CL dataset: catchment attributes and meteorology for large sample studies – Chile dataset. Hydrol. Earth Syst. Sci. Discuss. 1–40. https://doi.org/10.5194/hess-2018-2

Land use change dynamics of the las 20 years in 7 administrative regions of southern Chile

This dataset provides confusion matrices of the land use dynamics for 7 regions of southern chile in a period of 20 years. The regions are: Maule, Biobio, Araucania, Los Rios, Los Lagos, Aysen and Magallanes. This dataset is based on the clasification of land uses by Benra et al., 2019 (https://doi.org/10.1016/j.landusepol.2018.12.020) For the computation of the matrices the national vegetation cadaster and corresponding actualizations were used. The first five regions (Maule, Biobio, Araucania, Los Rios, Los Lagos) count with three points in time whereas the last two (Aysen, Magallanes) count with only two time steps. Accordingly, for the five first regions two confusion matrices are provided while for the last two one confusion matrix is provided. In the excel file each sheet corresponds to one region

Ecosystem Services tradeoffs in farm properties facing exotic tree plantation expansion

This database provides raw values of ecosystem services (ES) supply for 5 ecosystem services, namely, non-native tree plantation timber supply, native timber supply, water regulation, forage supply (from pastures) and recreation opportunities. The values are provided for two administrative units, the municipality and three type of farm properties (small, medium and large). Each ES has two columns, the first one represents the values of ES supply in a base year and the second one represents the values of ES supply for a projection where exotic tree plantations expand. The data can be used to compare changes in the supply of several ES at different administrative levels, using for instance statistical analysis such as correlations