Experimental Analysis of Transonic Flow Through the Variable Nozzle of a Radial Inflow Turbine

Gallus, H. E.; Lingner, U.; Ispas, I.

doi:10.1115/92-gt-090

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…The rotational speed of 150000 rpm is very large to be handled directly by the equipment. To overcome this, many researchers (Futral (1965), Ghassemi (2005), Spence (1997Spence ( , 2007, Artt (1998), Payri (2012), Deng (2007), Gallus (1992), Simpson (2009), Aghaali (2008), Hajilouy (2009)) have given the loading using air brake. The air brake is indirectly but compressor load, for which the initial and final state points of pressure and temperature are measured across the turbine and the load is calculated mathematically.…”

Section: Introductionmentioning

confidence: 99%

Design, Numerical Simulation and Experimental Investigation of Radial Inflow Micro Gas Turbine

Shah

Channiwala

Kulshreshtha

et al. 2019

JAFM

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The work arose initially from an interest in design of radial turbine for small scale gas turbine applications typically suitable for distributed power generation system which demands compact installations. The paper describes an investigation in to the design and performance of radial inflow turbines having a capacity of 25kW at 1,50,000 rpm. First a non-dimensional design philosophy is deduced to design a turbine rotor. The design approach is largely one dimensional along with empirical correlations for estimating losses used to obtain the main geometric parameters of turbine. From the proposed design approach, turbine total-to-static efficiency is calculated as 84.91% which is reasonably good. After that a modified vortex design procedure is developed to derive the non-dimensional volute geometry as a function of azimuth angle for actual flow condition. Once a specific turbine is designed, the flow is analyzed in detail using a three-dimensional Computational Fluid Dynamics (CFD) code in order to assess how accurately the performance is predicted by simple meanline analysis. Finally, a fully instrumented experimental setup is developed. The experimental investigations have been carried out to study the temperature and pressure distribution across turbine and total-to-static efficiency is calculated. The limitations of surging and choking in compressor as well as in the bearings to take up load at such high speed has allowed the tests to be conducted upto 70000 rpm only, with turbine inlet temperatures ranging from 900 K to 1000 K and a pressure ratio upto 1.79, which developed power in the range of 1.69 kW to 10.22 kW. The uncertainty bands are in order of ±13.76% to ±3.12%. It is observed that the CFD results are in good agreement with test results at off design condition. CFD models over predicted total to static efficiency by order of 7-8% at lower speed. These deviations are reduced as turbine runs close to design point.

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Section: Introductionmentioning

confidence: 99%

Design, Numerical Simulation and Experimental Investigation of Radial Inflow Micro Gas Turbine

Shah

Channiwala

Kulshreshtha

et al. 2019

JAFM

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Practical problems associated with laser anemometry in high speed turbomachines

Zaidi

1997

Optics and Lasers in Engineering

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Flow Studies using Laser Anemometry Technique in aSmall Power Unit Radial Inflow Turbine

Zaidi

Elder

1996

International Journal of Rotating Machinery

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T-100 is a multipurpose small power unit developed by Sundstrand Power Systems (USA). An extensive research programme was launched for the detailed tests of the rig components including inlet protection system, Compressor stage, Combustor and the Turbine stage. Turbomachinery Group at Cranfield was involved in the study of the Turbine unit used in this programme. From the design point of view, detailed aerodynamics in these small units are of great interest especially where high velocities and narrow passages are involved. Experimental study was carried out to investigate the flow in the region between the nozzle guide vanes and the turbine rotor entry. The main concern was to find out how the nozzle guide vane flow was modified by the rotor and how the rotor flow was affected by the nozzle guide vanes. Laser measurements were taken at these positions for various flow conditions. An other area which needs considerable attention is downstream of the turbine rotor where the turning of flow and mixing process make the situation very complicated. Laser studies were undertaken in that region and to gain more confidence on laser results, a Cobra pressure probe was traversed at these stations. This paper describes various steps undertaken to obtain laser results within the machine. At the end typical laser results have been presented and discussed.

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Experimental Analysis of Transonic Flow Through the Variable Nozzle of a Radial Inflow Turbine

Cited by 3 publications

References 6 publications

Design, Numerical Simulation and Experimental Investigation of Radial Inflow Micro Gas Turbine

Design, Numerical Simulation and Experimental Investigation of Radial Inflow Micro Gas Turbine

Practical problems associated with laser anemometry in high speed turbomachines

Flow Studies using Laser Anemometry Technique in aSmall Power Unit Radial Inflow Turbine

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