Journal ArticleDOI
Experimental investigations on effects of tip clearance in mixed-flow compressor performance:
D. Ramesh Rajakumar,S Ramamurthy,Mukka Govardhan +2 more
- Vol. 229, Iss: 5, pp 933-946
TLDR
In this article, the effect of tip clearance between impeller and stationary shroud in a mixed-flow compressor stage has been investigated, and it was found that the constant tip-clearance configurations showed better performance in terms of pressure ratio and efficiency as compared to variable clearance configurations.Abstract:
Experimental investigations were carried out to study the effect of tip clearance (between impeller and stationary shroud) in a mixed-flow compressor stage. Two configurations, namely constant and variable clearance gaps, between impeller and stationary shroud were considered. For the purpose of the present investigations, a mixed-flow compressor stage was designed, fabricated, and experimentally evaluated. The flow investigations were carried out in a closed-circuit compressor rig. Detailed steady and unsteady flow measurements were carried out for three clearance gaps, namely 0.5 mm, 0.75 mm, and 0.9 mm. Through the experimental investigations, it was found that the constant tip-clearance configurations showed better performance in terms of pressure ratio and efficiency as compared to variable clearance configurations. For a given configuration, the pressure ratio and efficiency of the stage decrease with increase in the tip gap without indicating any optimum value. Tip-clearance flow had considerable effect on the flow through the diffuser.read more
Citations
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Journal ArticleDOI
Dual stability enhancement mechanisms of axial-slot casing treatment in a high-speed mixed-flow compressor with various tip clearances
TL;DR: In this paper, the influence of axial-slot casing treatment (ASCT) on the performance and stability enhancement mechanisms of ASCT were experimentally and numerically investigated in a high-speed mixed-flow compressor under three different tip clearances.
Journal ArticleDOI
Closure to “Discussions of ‘Methods of Predicting the Tip Clearance Effects in Axial Flow Turbomachinery’” (1970, ASME J. Basic Eng., 92, pp. 480–481)
Journal ArticleDOI
Formation mechanism of static pressure circumferential double-peak distribution in a centrifugal compressor under the action of downstream boundary:
TL;DR: In the centrifugal compressor applied in the automobile turbochargers, the asymmetric structure of volute causes the non-uniform flow field in the impeller and compressor stall as discussed by the authors.
Design and performance of an experimental axial-discharge mixed-flow compressor II : over-all performance of impeller and supersonic-diffuser combination
Ward W Wilcox,William H Robbins +1 more
TL;DR: In this paper, an axial-discharge impeller and a 16-vaned supersonic diffuser cascade over a range of flow conditions at equivalent tip speeds varying from 800 to 1600 feet per second were investigated.
Journal ArticleDOI
Experimental validation of a compact mixed-flow compressor for an active high-lift system
TL;DR: In this article, the authors present the first experimental results obtained using a preliminary prototype at part-speed, i.e. rotational speeds from 20,000 to 30,000 rpm.
References
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Journal ArticleDOI
Methods of Predicting the Tip Clearance Effects in Axial Flow Turbomachinery
Journal ArticleDOI
An Approximate Analysis and Prediction Method for Tip Clearance Loss in Axial Compressors
J. A. Storer,N. A. Cumpsty +1 more
TL;DR: In this paper, a simple model for loss created by the tip clearance flow in axial compressors is presented, based on an experimental program performed in conjunction with the Dawes three-dimensional Navier-Stokes calculation method.
Journal ArticleDOI
Deterioration of Compressor Performance Due to Tip Clearance of Centrifugal Impellers
Yasutoshi Senoo,Masahiro Ishida +1 more
TL;DR: In this paper, the authors modified the tip clearance loss of centrifugal impellers to include the variation of slip coefficient of the impeller due to tip clearance by deriving a rational relationship between two empirical parameters in the theory.
Journal ArticleDOI
Small Turbomachinery Compressor and Fan Aerodynamics
TL;DR: In this article, the authors discuss aerodynamic considerations in the design of small turbomachinery axial and centrifugal compressors and fans and test results are presented to show the effect of scaling on compressor performance.