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<p>In recent times, mixed flow compressors have been increasingly researched for use in Micro Gas Turbine (MGT) engines. The interaction between the impeller and diffuser plays an important role in the overall performance of a compressor. A numerical investigation into the effect of the vaneless gap size on the performance of a subsonic MGT mixed flow compressor stage fitted with a crossover diffuser is presented. The numerical investigation is conducted using three baseline test compressor designs, which cover a wide range of design speeds, mass flow rates and impeller meridional exit (mixed flow) angles. These test compressors are designed using an in-house mean line design tool. The performance of each of the test compressors are evaluated at vaneless gap ratios (VGRs) of between 1.03 and 1.12. Commercial CFD software (Numeca FINE/Turbo™) is used to verify the performance results of the various test compressor configurations. It is found that, regardless of compressor configuration, the compressor performance curves move to the right with an increase in vaneless gap size. Within a recommended vaneless gap ratio range of 1.04 to 1.12, design point efficiency and pressure ratio differences remain within 1.5% and 3%, respectively for all three test compressors.</p>

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Numerical Investigation into the Effect of Vaneless Gap Size on the Performance of a MGT Mixed Flow Compressor Fitted with a Crossover Diffuser

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  • 发表日期：

    2025年6月4日

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  • H. van Eck

摘要

In recent times, mixed flow compressors have been increasingly researched for use in Micro Gas Turbine (MGT) engines. The interaction between the impeller and diffuser plays an important role in the overall performance of a compressor. A numerical investigation into the effect of the vaneless gap size on the performance of a subsonic MGT mixed flow compressor stage fitted with a crossover diffuser is presented. The numerical investigation is conducted using three baseline test compressor designs, which cover a wide range of design speeds, mass flow rates and impeller meridional exit (mixed flow) angles. These test compressors are designed using an in-house mean line design tool. The performance of each of the test compressors are evaluated at vaneless gap ratios (VGRs) of between 1.03 and 1.12. Commercial CFD software (Numeca FINE/Turbo™) is used to verify the performance results of the various test compressor configurations. It is found that, regardless of compressor configuration, the compressor performance curves move to the right with an increase in vaneless gap size. Within a recommended vaneless gap ratio range of 1.04 to 1.12, design point efficiency and pressure ratio differences remain within 1.5% and 3%, respectively for all three test compressors.