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Research Papers

Mathematical Analysis for Off-Design Performance of Cryogenic Turboexpander

[+] Author and Article Information
Subrata K. Ghosh

Department of ME and MME, ISM, Dhanbad, Jharkhand 826004, Indiasubratarec@yahoo.co.in

R. K. Sahoo, Sunil K. Sarangi

 NIT Rourkela, Orissa 769008, India

J. Fluids Eng 133(3), 031001 (Mar 10, 2011) (6 pages) doi:10.1115/1.4003661 History: Received July 14, 2009; Revised March 16, 2010; Published March 10, 2011; Online March 10, 2011

A study has been conducted to determine the off-design performance of cryogenic turboexpander. A theoretical model to predict the losses in the components of the turboexpander along the fluid flow path has been developed. The model uses a one-dimensional solution of flow conditions through the turbine along the mean streamline. In this analysis, the changes of fluid and flow properties between different components of turboexpander have been considered. Overall, turbine geometry, pressure ratio, and mass flow rate are input information. The output includes performance and velocity diagram parameters for any number of given speeds over a range of turbine pressure ratio. The procedure allows any arbitrary combination of fluid species, inlet conditions, and expansion ratio since the fluid properties are properly taken care of in the relevant equations. The computational process is illustrated with an example.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Components of the expansion turbine along the fluid flow path

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Figure 2

Flow chart for computation of off-design performance of an expansion turbine by using mean line method

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Figure 3

Variation of dimensionless mass flow rate with pressure ratio and speed

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Figure 4

Variation of efficiency with pressure ratio and speed

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Figure 5

Variation of different turboexpander loss coefficients with pressure ratio

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Figure 6

Variation of different turbine wheel loss coefficients with pressure ratio

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Figure 7

Variation of Mach number at different basic units of turboexpander with pressure ratio

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