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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Print: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v34.i4.30
pages 332-351

Unsteady Flow Behind Forward Swept Axial Compressor Rotors

Mukka Govardhan
Thermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras Chennai, India
O. G. Krishna Kumar
Thermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
N. Sitaram
Thermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India

ABSTRACT

The experimental investigations are conducted to improve the understanding of the complex flow pattern at the exit of forward and unswept axial compressor rotors. The unsteady flow pattern behind the experimental rotors was studied by a novel method using fast response probe. The data acquisition and post processing of the unsteady data was done using virtual instrumentation system. Forward swept rotor with 10° sweep showed improved pressure rise and efficiency compared to baseline unswept rotor. On the other hand, 20° forward swept rotor exhibited increased operating range and stall margin but at the expense of pressure rise. The wake pattern in the midspan regions with forward sweep indicated higher wake width and wake defect due to the high deceleration of the blade boundary layer flow brought about by the spanwise streamline shift. The reduction in wake width and wake defect with forward sweep near the hub suggests that the mixing loss near the hub is reduced.


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