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Technical Brief

A Simple and Fast Method for Calculating Properties Across a Condensation Shock

[+] Author and Article Information
V. Babu

Professor
Department of Mechanical Engineering,
Indian Institute of Technology,
Chennai 600 036, India
e-mail: vbabu@iitm.ac.in

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 24, 2017; final manuscript received March 26, 2018; published online May 2, 2018. Assoc. Editor: Devesh Ranjan.

J. Fluids Eng 140(10), 104501 (May 02, 2018) (3 pages) Paper No: FE-17-1681; doi: 10.1115/1.4039864 History: Received October 24, 2017; Revised March 26, 2018

A simple procedure for calculating the pressure at the onset and termination of condensation shocks that occur in steam nozzles and steam turbine blade passages is presented. In addition, the location of the termination of the condensation shock with reference to the throat location is also predicted. The procedure is based entirely on thermodynamic and gas dynamic considerations, without using a model for droplet nucleation and growth and the nozzle profile. The only input required is the stagnation condition at the inlet to the nozzle. The procedure requires the solution of a system of algebraic equations which can be accomplished quite easily. Calculations have been carried out for several inlet stagnation conditions and the predictions are compared with the available experimental data. The agreement is seen to be reasonable considering the simplicity of the procedure.

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References

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Young, J. B. , and Bakhtar, F. , 1976, “ Comparison Between Theoretical Calculations and Experimental Measurements of Droplet Sizes in Nucleating Steam Flows,” Trans. Inst. Fluid-Flow Mach., 70–72, pp. 259–271.
White, A. J. , Young, J. B. , and Walters, P. T. , 1996, “ Experimental Validation of Condensing Flow Theory for a Stationary Cascade of Steam Turbine Blades,” Philos. Trans. R. Soc. London A, 354(1704), pp. 59–88. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Expansion of initially superheated steam in a nozzle. Exit state is marked e.

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