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A study of heterogeneous nucleation and electrostatic charge in steam flows

Buckley, John Richard (2004)
Ph.D. thesis, University of Birmingham.

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Abstract

This thesis describes two experimental investigations concerned with condensing flows of steam in a cascade of turbine blading. The first considers the effect of heterogeneous nucleation on the flow of condensing steam. The second is concerned with the measurement of electrostatic charges generated on first nucleation in steam.
The facility used in this investigation is a blow-down steam tunnel constructed for the study of two-phase flows in a cascade of turbine blading. To carry out the first part of the investigation, substantial modifications were introduced to generate a supply of ultra-pure steam for admission into the blade cascade. This allowed a base line set of blade surface pressure measurements to be recorded in the absence of impurities. In subsequent tests the steam was dosed with known quantities of aqueous ammonia to investigate the influence of chemical impurities on the condensation process.
To investigate electrostatic effects a Langmuir probe for operation in steam was developed. Charge distribution was recorded with the probe mounted upstream and downstream of the blade cascade. Observations were recorded over two pressure ratios, using ultra-pure steam and, in subsequent tests, steam dosed with known quantities of aqueous ammonia.
Comparisons are carried out between the base line measurements using ultra-pure steam and the measurements using dosed steam. Both sets of results are compared with those of previous investigators. The electrostatic measurements are compared with similar measurements recorded by investigators working in LP steam turbines. The results are discussed and conclusions drawn.

Type of Work:Ph.D. thesis.
Supervisor(s):Bakhtar, F.
School/Faculty:Schools (1998 to 2008) > School of Engineering
Department:School of Mechanical and Manufacturing Engineering
Keywords:steam, nucleation, meterogeneous, electrostatic, wet, thermodynamics
Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:5884
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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