A three-dimensional upwind parabolized Navier-Stokes code for real gas flows

In this work a numerical investigation of a four stage heavy-duty gas turbine is presented. Fully three-dimensional, multistage, Navier-Stokes analyses are carried out to predict the overall turbine performance. Coolant injections, cavity purge flows, and leakage flows are included in the turbine modeling by means of suitable wall boundary conditions. The main objective is the evaluation of the impact of gas modeling on the prediction of the stage and turbine performance parameters. To this end, four different gas models were used: three models are based on the perfect gas assumption with different values of constant cp, and the fourth is a real gas model which accounts for thermodynamic gas properties variations with temperature and mean fuel∕air ratio distribution in the through-flow direction. For the real gas computations, a numerical model is used which is based on the use of gas property tables, and exploits a local fitting of gas data to compute thermodynamic properties. Experimental measurements are available for comparison purposes in terms of static pressure values at the inlet∕outlet of each row and total temperature at the turbine exit.

Download Full-text

Real Gas Effects in Turbomachinery Flows: A Computational Fluid Dynamics Model for Fast Computations

Journal of Turbomachinery ◽

10.1115/1.1738121 ◽

2004 ◽

Vol 126 (2) ◽

pp. 268-276 ◽

Cited By ~ 23

Author(s):

Paolo Boncinelli ◽

Filippo Rubechini ◽

Andrea Arnone ◽

Massimiliano Cecconi ◽

Carlo Cortese

Keyword(s):

Fluid Dynamic ◽

Computational Cost ◽

Three Dimensional ◽

Industrial Applications ◽

Design Tool ◽

Navier Stokes ◽

Computational Time ◽

Real Gas ◽

Real Gas Effects ◽

Low Computational Cost

A numerical model was included in a three-dimensional viscous solver to account for real gas effects in the compressible Reynolds averaged Navier-Stokes (RANS) equations. The behavior of real gases is reproduced by using gas property tables. The method consists of a local fitting of gas data to provide the thermodynamic property required by the solver in each solution step. This approach presents several characteristics which make it attractive as a design tool for industrial applications. First of all, the implementation of the method in the solver is simple and straightforward, since it does not require relevant changes in the solver structure. Moreover, it is based on a low-computational-cost algorithm, which prevents a considerable increase in the overall computational time. Finally, the approach is completely general, since it allows one to handle any type of gas, gas mixture or steam over a wide operative range. In this work a detailed description of the model is provided. In addition, some examples are presented in which the model is applied to the thermo-fluid-dynamic analysis of industrial turbomachines.

Download Full-text

An upwind parabolized Navier-Stokes code for real gas flows

10.2514/6.1988-713 ◽

1988 ◽

Cited By ~ 3

Author(s):

JOHN TANNEHILL ◽

JOHN IEVALTS ◽

SCOTT LAWRENCE

Keyword(s):

Navier Stokes ◽

Gas Flows ◽

Real Gas

Download Full-text

A Study of the Three-Dimensional Unsteady Real-Gas Flows Within a Transonic ORC Turbine

Volume 3B: Oil and Gas Applications; Organic Rankine Cycle Power Systems; Supercritical CO2 Power Cycles; Wind Energy ◽

10.1115/gt2014-25475 ◽

2014 ◽

Cited By ~ 12

Author(s):

Andrew P. S. Wheeler ◽

Jonathan Ong

Keyword(s):

Three Dimensional ◽

Organic Rankine Cycle ◽

Leading Edge ◽

Rankine Cycle ◽

Gas Flows ◽

Cfd Simulations ◽

Significant Drop ◽

Real Gas ◽

Turbine Efficiency ◽

Real Gas Effects

In this paper we investigate the three-dimensional unsteady real-gas flows which occur within Organic Rankine Cycle (ORC) turbines. A radial-inflow turbine stage operating with supersonic vane exit flows (M ≈ 1.4) is simulated using a RANS solver which includes real-gas effects. Steady CFD simulations show that small changes in the inducer shape can have a significant effect on turbine efficiency due to the development of supersonic flows in the rotor. Unsteady predictions show the same trends as the steady CFD, however a strong interaction between the vane trailing-edge shocks and rotor leading-edge leads to a significant drop in efficiency.

Download Full-text

Three-dimensional effects upon real gas flows past the Space Shuttle

10.2514/6.1984-225 ◽

1984 ◽

Cited By ~ 6

Author(s):

M. KIM ◽

C. LEWIS

Keyword(s):

Space Shuttle ◽

Three Dimensional ◽

Gas Flows ◽

Real Gas ◽

Dimensional Effects

Download Full-text

THREE-DIMENSIONAL INSTANTANEOUS STREAMLINESOF GAS FLOWS FOR SIMULATION THE STEADY-STATE OUTPUT OF AN ARTIFICIAL TORNADO

Oil and Gas Studies ◽

10.31660/0445-0108-2018-2-71-76 ◽

2018 ◽

pp. 71-76

Author(s):

R. E. Volkov ◽

A. G. Obukhov

Keyword(s):

Steady State ◽

Stokes Equations ◽

Complete System ◽

Three Dimensional ◽

Unsteady Flows ◽

Navier Stokes ◽

Gas Flows ◽

Heat Conducting ◽

Navier Stokes Equations ◽

Coriolis Forces

The method of parallelizing a numerical solution of the complete system of Navier - Stokes equations is used to describe three-dimensional unsteady flows of a viscous compressible heat-conducting gas in ascending swirling flows. In this case the action of gravity and Coriolis forces is taken into account, and the coefficients of viscosity and thermal conductivity are assumed to be constant. The results of the numerical construction of instantaneous streamlines characterizing complex three-dimensional flows are presented for simulation the steady-state output of an ascend-ing swirling air flow in an artificial tornado.

Download Full-text