Numerical Investigation of the Influence of Flow Parameters Nonuniformity at the Diffuser Inlet on Characteristics of the GTE Annular Combustion Chamber

Abstract

Parameters at a combustion chamber’s inlet significantly vary in an aircraft engine’s transient states of operation. At the same time, there is a significant spatial heterogeneity of flow parameters at a diffuser inlet of a combustion chamber, which is defined by nature of flow in a compressor and an individual for each mode of operation of a specific gas generator. In this paper presented a study of an influence of radial and circumferential nonuniformities of flow parameters on characteristics of a combustion chamber. Multi spray for annular combustion chamber with two rows of burner is considered. Z-shaped sector, which contains two nozzles of outer and two nozzles of inner row, was selected as the calculated domain. Calculations were carried out in ANSYS Fluent 14.5 software package with an implementation of cluster analysis. Nonuniformity at a diffuser inlet was set as fifth degree polynomial, which was derived from a numerical simulation of a compressor. As a result it was established, that radial nonuniformity of flow parameters at an inlet of a combustion chamber influences on characteristics of a combustion chamber. A stretched shape of velocity profile contributes to higher air flow dynamic pressure on dome than using uniform profile air velocity. At that, local equivalents ratio excess are changing, and consequently, sizes and location NOx production zones are changing as well. The residual rotation of flow from the compressor leads to a lesser effect on total pressure drop and air distribution in flame tube. The obtained results showed that, during a design of a combustion chamber, it is necessary to take into account nonuniformity of parameters’ distribution at its inlet.

Multinozzle Combustion Chamber of Aviation Gas Turbine Engines as a Basis of Environmental Safety. Review

“…The JSC "Kuznetsov" (formerly known as the Kuznetsov Design Bureau, Samara City, Russian Federation) in collaboration with Samara National Research University (Samara City, Russian Federation) carried out considerable research on multinozzle burning process (Lukachev, 1998). Some results are described in (Orlov and Matveev, 2014a,b;Matveev et al, 2015;Orlov et al, 2014;Ermakov et al, 2014;Krivcov et al, 2014;Gritsenko et al, 2002;Danilchenko et al, 2008). These results formed the basis for the development of the highly reliable and environmentally friendly CC of a GTE.…”

PIV measurement and CFD simulations of an air terminal device with a dynamically adapting geometry

“…During the simulation, a turbulent model k-ε was used: a model of two equations in which the turbulent viscosity depends on kinetic energy "k" and turbulent dispersion "ε" [21]. Additionally, the program has already been used to study strictly air terminal devices [22,23], and the impact of ventilation and air-conditioning systems on air quality and thermal comfort for many years [24,25].…”