Dense Gas Flow in Minimum Length Nozzles

Aldo, Andrew C.; Argrow, Brian

doi:10.1115/1.2817140

Cited by 25 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this region (where J > 0) classical gas dynamics are inverted; expansion waves converge forming expansion shocks and compression waves form compression fans. To the author's knowledge there has been only one experimental investigation showing non-classical effects [5], but computational simulations have shown these effects may exist in ORC turbines [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Study of Trailing-Edge Losses in Organic Rankine Cycle Turbines

Galiana

Wheeler

Ong

2016

Journal of Turbomachinery

View full text Add to dashboard Cite

In this paper, vane trailing-edge losses which occur in organic rankine cycle (ORC) turbines are investigated. Experiments are performed to study the influence of dense gas effects on trailing-edge loss in supersonic flows using a novel Ludwieg tube facility for the study of dense-gas flows. The data is also used to validate a computational fluid dynamics (CFD) flow solver. The computational simulations are then used to determine the contributions to loss from shocks and viscous effects which occur at the vane trailing edge. The results show that dense gas effects play a vital role in the structure of the trailing-edge flow, and control the extent of shock and viscous losses.

show abstract

Section: Introductionmentioning

confidence: 99%

A Study of Trailing-Edge Losses in Organic Rankine Cycle Turbines

Galiana

Wheeler

Ong

2016

Journal of Turbomachinery

View full text Add to dashboard Cite

show abstract

“…The performance of both the FV scheme (7) and FE/FV scheme (14) is crucially dependent on the choice of the numerical ux function. To achieve second-order accuracy and avoid the generation of spurious oscillations in the neighbourhood of the shocks, a total variation diminishing (TVD) numerical ux formula is used in zFlow.…”

Section: Space Discretizationmentioning

confidence: 99%

“…The opposite trend of the sound speed with respect to density introduces many interesting e ects, like the impossibility of compression shocks in that region, the suppression of shock-induced separation and non-conventional shapes of the channel for the supersonic acceleration from supercritical stagnation conditions (see e.g. References [2][3][4][5][6][7][8][9]). Fluids exhibiting non-classical behaviour are called BZT after the initials of the scientists who ÿrst formulated the theory.CFD simulations of dense gases in the classical regime are reported in the literature.…”

mentioning

confidence: 99%

Numerical simulation of dense gas flows on unstructured grids with an implicit high resolution upwind Euler solver

Colonna

Rebay

2004

Numerical Methods in Fluids

View full text Add to dashboard Cite

The study of the dense gas flows which occur in many technological applications demands for fluid dynamic simulation tools incorporating complex thermodynamic models that are not usually available in commercial software. Moreover, the software mentioned can be used to study very interesting phenomena that usually go under the name of ‘non-classical gasdynamics’, which are theoretically predicted for high molecular weight fluids in the superheated region, close to saturation. This paper presents the numerical methods and models implemented in a computer code named zFlow which is capable of simulating inviscid dense gas flows in complex geometries. A detailed description of the space discretization method used to approximate the Euler equations on unstructured grids and for general equations of state, and a summary of the thermodynamic functions required by the mentioned formulation are also given. The performance of the code is demonstrated by presenting two applications, the calculation of the transonic flow around an airfoil computed with both the ideal gas and a complex equation of state and the simulation of the non-classical phenomena occurring in a supersonic flow between two staggered sinusoidal blades. Non-classical effects are simulated in a supersonic flow of a siloxane using a Peng–Robinson-type equation of state. Siloxanes are a class of substances used as working fluids in organic Rankine cycles turbines

show abstract

“…In this context, the mathematical model of the perfect gas (PG) becomes a special case of the model with high temperature (HT). The design of nozzles operating with non-ideal gases is currently an active area of research in the design of ORC turbines [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of bipropellant combustion products on the rocket nozzle design

Abada

El-Hirtsi

2020

Mechanics & Industry

View full text Add to dashboard Cite

The focus of this research work is to investigate numerically the effect of adding the gas on the design and performance of axisymmetric MLN nozzles. A FORTRAN code was developed to design this nozzle using the characteristics method (MOC) at high temperature. The thermochemical and combustion studies of the most used liquid propellants on the satellites and launch vehicles allow to known all gases. Four engines are investigated: Ariane 5 (Vulcain 2), Ariane-5 upper stage engine (Aestus), Zenit first stage (RD-170) and Falcon 9 upper stage (Raptor). Thermodynamic analysis of parameters design MLN (such as length, Mach number, mass, thrust coefficient) was conducted. The comparison shows that the presence of 50% of H2O gas in combustion species increases the nozzle design parameters (diatomic gas including air) in the order of 25%. On the other hand, the existence of CO2 gas considerably increases approximately 35% the length and the exhaust radius. These rise depend on gases percentage in the combustion. The truncation method is applied in the MLN nozzles to optimize the thrust/weight ratio.

show abstract

Dense Gas Flow in Minimum Length Nozzles

Cited by 25 publications

References 17 publications

A Study of Trailing-Edge Losses in Organic Rankine Cycle Turbines

A Study of Trailing-Edge Losses in Organic Rankine Cycle Turbines

Numerical simulation of dense gas flows on unstructured grids with an implicit high resolution upwind Euler solver

Effect of bipropellant combustion products on the rocket nozzle design

Contact Info

Product

Resources

About