An Approximate Method to Obtain Thermodynamic Gas Properties for Use in Gas Turbines

2014 ◽  
Author(s):  
N. A. Cumpsty ◽  
A. J. Marquis
Keyword(s):  
Thermodynamic Properties ◽  
Approximate Method ◽  
Gas Turbines ◽  
Combustion Products ◽  
Empirical Approach ◽  
Polynomial Approximations ◽  
Adequate Accuracy ◽  
Computer Based ◽  
Educational Course ◽  
Gas Properties

The calculation of the performance of gas turbines, turbochargers, compressors and turbines requires the thermodynamic properties of the gases. Tables of properties exist which are effectively exact, but using these tables is tedious and far from practical in computer-based calculations. Representing tabulated results with polynomial approximations is inconvenient and prone to error in implementation. For teaching and simple calculations simple approximations, such as γ = 1.4 for unburned air and γ = 1.3 for combustion products, are sometimes used, but this is far from wholly satisfactory. This paper describes and discusses a simple empirical approach which will give adequate accuracy for many purposes but is simple enough to be used as part of an educational course.

Investigation of Gas Properties for Combustion Products of Organic Fuels

2006 ◽  
Author(s):  
SooYong Kim ◽  
Valeri P. Kovalevsky ◽  
Dae-Seung Kim
Keyword(s):  
Thermodynamic Properties ◽  
Combustion Products ◽  
Ideal Gas ◽  
Cycle Performance ◽  
Design Stage ◽  
Working Fluid ◽  
Organic Fuel ◽  
Humid Air ◽  
Gas Combustion ◽  
Gas Properties

In making cycle performance calculation, it is first necessary to establish data relating to the properties of the working fluid of turbo-machinery. Because the composition of natural gas combustion products varies, along with the fuel chemistry, unique formulae for their gas properties do not exist, hence the calculation becomes more complex. Thermodynamic properties depend not only on composition of gases but also on assumptions concerning the change of composition during each process in which temperature, pressure or some other thermodynamic state functions may be shifting. In the present study, a calculation method of gas constants, heat capacity, enthalpy of dry, humid air and combustion products of organic fuel are studied. A theoretical base of thermodynamic properties of gas mixtures constructed on a model of ideal gas is formulated. The composition products are represented by the mixture of ideal gases, humid air and steam directly participating in the burning process and the products of stoichiometric combustion of any organic fuel. The developed calculation procedure is validated through comparison with tabulated data in open literatures and it presented satisfactory results. Recommendation for the application of the suggested method with restriction in relation to range of temperature for static and dynamic calculation is also given. It is supposed that the present method and its result can be used in the preliminary design stage of heat exchangers, high temperature gas turbine units and boilers.

A discussion on advanced methods of energy conversion- Magnetohydrodynamic power generation - Wave growth in m .h.d. generators

1967 ◽  
Vol 261 (1123) ◽  
pp. 461-470 ◽  
Keyword(s):  
Thermodynamic Properties ◽  
Acoustic Waves ◽  
Subsonic Flow ◽  
Flow Direction ◽  
Noble Gas ◽  
Travelling Waves ◽  
Combustion Products ◽  
Stationary Waves ◽  
Ohmic Dissipation ◽  
Steady Current

It has been shown that in an m.h.d. generator, acoustic waves can grow due to the coupling of fluctuations in electrical conductivity, Hall parameter and thermodynamic properties of the gas, with the ohmic dissipation and electromagnetic body forces. A new analysis of this phenomenon is presented in which waves travelling at an arbitrary angle to the flow direction in a plane perpendicular to the magnetic field are considered. In contrast to McCune’s (1964) treatment the thermodynamic properties are not restricted to perfect gas laws; and the condition for spatially and temporally growing waves is examined using a general dispersion relation which includes both these types of wave. We consider in detail (i) stationary waves in supersonic flow, and (ii) travelling waves in the subsonic flow found in the G.E.G.B. 200 MW thermal input generator being built at Marchwood, and a possible power station m.h.d. generator. It is found that the waves in the 200 MW rig which burns kerosene in oxygen will be damped. But in an oil-air combustion products generator for Hall parameters of order 3 or greater, it is found that stationary waves which grow rapidly may occur at Mach numbers greater than about 1-7; and in subsonic flow waves propagating antiparallel to the steady current vector may be amplified, though the growth rate is not excessive. In noble gas m.h.d. generators these waves are more unstable than in the oil, air combustion products generator.

Taipower Tunghsiao Stag Combined Cycle Power Plant

1984 ◽  
Author(s):  
Leroy O. Tomlinson ◽  
David C. Timmerman
Keyword(s):  
Control Systems ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Residual Oil ◽  
Steam Generation ◽  
Cycle Systems ◽  
Computer Based ◽  
Steam System ◽  
Operating History ◽  
Distinguishing Features

Units 1 and 2 in the Tiawan Electric Power Co. (Taipower) are General Electric STAG 307E combined cycle systems with rated output of 570 MW. These combined cycle generation systems include high technology gas turbines, an unfired steam system with steam generation at two pressures and computer based control systems. The net plant thermal efficiency at the rating point is 45.3% on distillate oil and 44.8% on residual oil. Currently one of the six gas turbines is operating on residual oil and five are operating on distillate. When the residual oil conversion is complete, these will be the World’s most efficient residual oil fired power generation units. A description of the distinguishing features, construction and early operating history are presented.

Thermodynamic properties of coal combustion products

2006 ◽  
Vol 53 (10) ◽  
pp. 842-847
Author(s):  
E. V. Samuilov ◽  
N. A. Sheveleva
Keyword(s):  
Thermodynamic Properties ◽  
Coal Combustion ◽  
Combustion Products ◽  
Coal Combustion Products

A Table of Thermodynamic Properties of Air

1943 ◽  
Vol 10 (3) ◽  
pp. A123-A130
Author(s):  
Joseph H. Keenan ◽  
Joseph Kaye
Keyword(s):  
Thermodynamic Properties ◽  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Linear Interpolation ◽  
Combustion Engines ◽  
Dry Air ◽  
Single Argument ◽  
Air Compressors

Abstract Over the range of conditions for which the equation pv = RT represents satisfactorily the p-v-T relation, a table having a single argument, the temperature, serves all the purposes which are served by vapor tables (steam tables, ammonia tables, etc.) having two arguments. A table of this sort with intervals small enough for linear interpolation is presented for dry air. Data from this table are compared with corresponding values from the tables of Sage and Lacey. The use of the table is illustrated with examples of the calculation of processes involved in air compressors, nozzles, internal-combustion engines, and gas turbines.

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