An optical technique for characterizing the liquid phase of steam at the exhaust of an LP turbine

Kercel, S.W.; Simpson, M.L.; Azar, Michael; Young, Michael Y.

doi:10.2172/10165558

Cited by 1 publication

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“…The probe tip diameters are limited to 20 mm. A different approach for fine droplet sizing (D d < 10 μm) was proposed by Kercel et al [23]. They developed an optical system using a multiple-line argon laser in order to measure the size and velocity of water droplets in the last stage of an LP turbine without perturbing the flow.…”

Section: Introductionmentioning

confidence: 99%

An optical backscatter probe for time resolved droplet measurements in turbomachines

Bosdas

Mansour

Kalfas

et al. 2015

Meas. Sci. Technol.

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The presence of particles in the flow path of turbomachines can result in undesirable engine operation. In order to improve the efficiency of turbomachines and guarantee their safe operation, the flow mechanisms that govern the particles’ need to be studied and associated with the main aerodynamic flow field. This paper describes a newly developed optical backscatter probe for droplet diameter and speed measurements in turbomachines. The miniature probe has a tip diameter of 5 mm and is capable of resolving droplets from 40 to 110 μm in diameter that travel up to 200 m s−1. The calibration of the novel probe is performed with a droplet generator capable of producing monodispersed water droplets. In addition, the probe is calibrated for droplet speed measurements in the same calibration facility. The paper conducts a detailed uncertainty analysis and describes the post processing code. In the final part of this paper the probe is used in an axial turbine with an installed spray generator to perform droplet measurements under two different operating conditions. Measurements have shown that the part load condition results in larger droplet diameters and higher relative droplet speeds. As a consequence higher erosion rates at the rotor leading edge suction side will occur when operating at part load condition.

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Section: Introductionmentioning

confidence: 99%