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    Mixed Flow Turbines: Inlet and Exit Flow Under Steady and Pulsating Conditions

    Source: Journal of Turbomachinery:;2001:;volume( 123 ):;issue: 002::page 359
    Author:
    N. Karamanis
    ,
    R. F. Martinez-Botas
    ,
    C. C. Su
    DOI: 10.1115/1.1354141
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The performance and detailed flow characteristics of a high pressure ratio mixed flow turbine has been investigated under steady and pulsating flow conditions. The rotor has been designed to have a nominal constant incidence (based on free vortex flow in the volute) and it is for use in an automotive high speed diesel turbocharger. The results indicated a departure from the quasi-steady analysis commonly used in turbocharger turbine design. The pulsations from the engine have been followed through the inlet pipe and around the volute; the pulse has been shown to propagate close to the speed of sound and not according to the bulk flow velocity as stated by some researchers. The flow entering and exiting the blades has been quantified by a laser Doppler velocimetry system. The measurements were performed at a plane 3.0 mm ahead of the rotor leading edge and 9.5 mm behind the rotor trailing edge. The turbine test conditions corresponded to the peak efficiency point at 29,400 and 41,300 rpm. The results were resolved in a blade-to-blade sense to examine in greater detail the nature of the flow at turbocharger representative conditions. A correlation between the combined effects of incidence and exit flow angle with the isentropic efficiency has been shown. The unsteady flow characteristics have been investigated at two flow pulse frequencies, corresponding to internal combustion engine speeds of 1600 and 2400 rpm. Four measurement planes have been investigated: one in the pipe feeding the volute, two in the volute (40 deg and 130 deg downstream of the tongue) and one at the exit of the turbine. The pulse propagation at these planes has been investigated; the effect of the different planes on the evaluation of the unsteady isentropic efficiency is shown to be significant. Overall, the unsteady performance efficiency results indicated a significant departure from the corresponding steady performance, in accordance with the inlet and exit flow measurements.
    keyword(s): Flow (Dynamics) , Rotors , Turbines , Blades , Pressure AND Design ,
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      Mixed Flow Turbines: Inlet and Exit Flow Under Steady and Pulsating Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/126063
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    contributor authorN. Karamanis
    contributor authorR. F. Martinez-Botas
    contributor authorC. C. Su
    date accessioned2017-05-09T00:06:18Z
    date available2017-05-09T00:06:18Z
    date copyrightApril, 2001
    date issued2001
    identifier issn0889-504X
    identifier otherJOTUEI-28687#359_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/126063
    description abstractThe performance and detailed flow characteristics of a high pressure ratio mixed flow turbine has been investigated under steady and pulsating flow conditions. The rotor has been designed to have a nominal constant incidence (based on free vortex flow in the volute) and it is for use in an automotive high speed diesel turbocharger. The results indicated a departure from the quasi-steady analysis commonly used in turbocharger turbine design. The pulsations from the engine have been followed through the inlet pipe and around the volute; the pulse has been shown to propagate close to the speed of sound and not according to the bulk flow velocity as stated by some researchers. The flow entering and exiting the blades has been quantified by a laser Doppler velocimetry system. The measurements were performed at a plane 3.0 mm ahead of the rotor leading edge and 9.5 mm behind the rotor trailing edge. The turbine test conditions corresponded to the peak efficiency point at 29,400 and 41,300 rpm. The results were resolved in a blade-to-blade sense to examine in greater detail the nature of the flow at turbocharger representative conditions. A correlation between the combined effects of incidence and exit flow angle with the isentropic efficiency has been shown. The unsteady flow characteristics have been investigated at two flow pulse frequencies, corresponding to internal combustion engine speeds of 1600 and 2400 rpm. Four measurement planes have been investigated: one in the pipe feeding the volute, two in the volute (40 deg and 130 deg downstream of the tongue) and one at the exit of the turbine. The pulse propagation at these planes has been investigated; the effect of the different planes on the evaluation of the unsteady isentropic efficiency is shown to be significant. Overall, the unsteady performance efficiency results indicated a significant departure from the corresponding steady performance, in accordance with the inlet and exit flow measurements.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleMixed Flow Turbines: Inlet and Exit Flow Under Steady and Pulsating Conditions
    typeJournal Paper
    journal volume123
    journal issue2
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.1354141
    journal fristpage359
    journal lastpage371
    identifier eissn1528-8900
    keywordsFlow (Dynamics)
    keywordsRotors
    keywordsTurbines
    keywordsBlades
    keywordsPressure AND Design
    treeJournal of Turbomachinery:;2001:;volume( 123 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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