Publications

Angular response of hot wire probes

Authors:

L. di Mare, T. O. Jelly and I. J. Day

Publication:

Measurement Science and Technology

DOI:

10.1088/1361-6501/aa5014

Effects of tip-clearance on stall inception in a multi-stage compressor

Authors:

Berdanier, R., Smith, N, Young, A., and Key, N

Publication:

AIAA Journal of Propulsion and Power

DOI:

10.2514/1.B36364

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The Effect of Rotor Casing on Low-Pressure Steam Turbine and Diffuser Interactions

The present study aims to investigate the interaction between a last-stage steam turbine blade row and diffuser. This work is carried out using computational fluid dynamics (CFD) simulations of a generic last-stage low-pressure (LP) turbine and axial–radial exhaust diffuser attached to it. In order to determine the validity of the computational method, the CFD predictions are first compared with data obtained from an experimental test facility. A computational study is then performed for different design configurations of the diffuser and rotor casing shapes. The study focuses on typical flow features such as effects of rotor tip leakage flows and subsequent changes in the rotor–diffuser interactions. The results suggest that the rotor casing shape influences the rotor work extraction capability and yields significant improvements in the diffuser static pressure recovery.

Authors:

Gursharanjit Singh, Andrew P. S. Wheeler and Gurnam Singh

Publication:

Journal of Engineering for Gas Turbines and Power

DOI:

10.1115/1.4034417

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The over-tip leakage represents a third of the loss encountered in a typical high-pressure turbine stage. In this paper, numerical investigations are carried out to study the effects of different tip designs on the aerodynamic performance and cooling requirements. A parametric design tool is used to conduct an automatic optimisation of the blade tip. The parameterisation allows overhangs to be added to the tip of the aerofoil to form a winglet, and in addition, a recessed cavity can be applied to produce a squealer tip. The squealer rim may also be opened near the leading-edge and the trailing-edge of the aerofoil. Flow computations are performed by an in-house 3D high fidelity computational fluid dynamic solver for predicting the performance of the component. The solver has been validated with experimental data. Following a preliminary design of experiment, a meta-model is built and an automatic, multi-objective optimisation is carried out to reduce the loss introduced by the over-tip

Authors:

Caloni, S, Shahpar, S, Coull, JD

Publication:

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY

DOI:

10.1177/0957650916661459