Sökning: "Purge Air"

Hittade 4 uppsatser innehållade orden Purge Air.

  1. 1. CFD Analysis of Pressure Instabilities in Stator-Rotor Disc Cavity Systems

    Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

    Författare :Pedro Santiago Parras Blázquez; [2017]
    Nyckelord :;

    Sammanfattning : The continuous demand to improve turbine performance has led manufactures to focus on aspects that have been previously considered of secondary importance such as the secondary air system. The purpose of this system is to cool the components and prevent ingestion of hot gas into the stator-rotor cavity that could lead to low frequency pressure fluctuations called Cavity Flow Instabilities. LÄS MER

  3. 2. Accelerated degradation of bipolar plates in the PEMFC

    Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

    Författare :Marcus Eriksson; [2016]
    Nyckelord :;

    Sammanfattning : The aging of bipolar plates in the polymer electrolyte membrane fuel cell was evaluated using different accelerated degradation tests. From previous studies, it is well known that the startups and shutdowns of a polymer electrolyte membrane fuel cell is the primary cause of fuel cell component degradation. LÄS MER

  4. 3. CFD INVESTIGATION OF THE PURGE AIR INFLUENCE ON THE FLOW STRUCTURE AND BEHAVIOUR OF GAS TURBINE STAGE AND ROTOR-STATOR DISC CAVITY SYSTEM

    Master-uppsats, KTH/Kraft- och värmeteknologi

    Författare :Jan Grudziecki; [2015]
    Nyckelord :Cavity; Purge Air; Ingress; Gas Turbine; CFD;

    Sammanfattning : Gas turbines operate with medium of very high temperatures, which requires using advanced materials for vanes and blades and sophisticated methods of their cooling. Other parts of the turbine have to be protected from contact with hot gases. Discs that hold vanes and blades are especially exposed to this danger. LÄS MER

  5. 4. 1D Turbine Design Tool Validation and Loss Model Comparison: Performance Prediction of a 1-stage Turbine at Different Pressure Ratios

    Master-uppsats, KTH/Kraft- och värmeteknologi

    Författare :Jonas Persson; [2015]
    Nyckelord :gas turbine; 1D design tool; validation; loss models; performance prediction; pressure ratio; purge flow;

    Sammanfattning : This work concerns the validation of two 1D Turbine Design Tools, AXIAL by Concepts NREC and TML by GKN Aerospace, and is purely computational. By using the KTH Test Turbine as a reference frame, these two software programs were set up to simulate its performance, and the results consequently validated against existing experimental data from the turbine. LÄS MER