Conjugate Heat Transfer Analysis of Turbine Rotor-Stator System

Abstract

A fluid-solid conjugate solver has been newly developed and applied to an actual engine disk system. Most of the currently available conjugate solvers lack the special thermal modeling for turbomachinery disk system applications. In the present new code, these special models are implemented to expand the applicability of the conjugate method and to reduce the required computational resources. Most of the conjugate analysis work so far were limited to the axisymmetric framework. However, the actual disk system includes several non-axisymmetric components which inevitably affect the local heat transfer phenomena. This paper presents 3D conjugate analysis of a single stage high pressure turbine rotor-stator disk system to assess these three-dimensional effects. The predicted temperatures shows good agreement with measured data. The calculated results revealed the three-dimensional analysis is crucial to predict the correct heat transfer field which is especially important in transient situations.

Coupled Fluid-Structure Transient Thermal Analysis of a Gas Turbine Internal Air System With Multiple Cavities

“…Among the advantages it may offer are a lower level of human intervention and time required to set up the models, and more importantly, automatic generation of the boundary conditions for the downstream components. However, this comes at a price of a considerably higher computational effort required to run a simulation through an engine transient flight cycle leading to long analysis times.Many studies in recent years sought to improve the predictive capabilities of thermo-mechanical analysis codes by coupling FE solvers to detailed CFD models of individual components to more accurately evaluate wall temperature distribution in turbine cavities, see, for example, [3,4,5,6,7]. While these studies were able to obtain only a general agreement with the experimental data, they did demonstrate many of the fundamental features outlined in earlier investigations.…”

“…A time step is accepted whenever the interface temperature difference becomes smaller than 2.5K. The Anderson mixing parameters are set to 0.5 for the drive cone cavity (1), 0.4 for two pre-swirl cavities (2)-(3) and 0.3 for both bore and rear cavities (4)- (5). The simulations are conducted on a Linux cluster utilizing in most situations 144 processors.…”

“…Monolithic methods incorporate different physics phenomena over multiple domains in a single highly specialized solver (typically a modified CFD code, see, for example, [11,5,12]), but generally they lack modeling flexibility. More flexible and reliable partitioned approaches solve the fluid and solid problems separately with the existing codes subject to complementary coupling transmission conditions.…”

Coupled Fluid-Structure Transient Thermal Analysis of a Gas Turbine Internal Air System With Multiple Cavities

“…Many studies in recent years sought to improve the predictive capabilities of thermo-mechanical analysis codes by coupling FE solvers to detailed CFD models of individual components to more accurately evaluate wall temperature distribution in turbine cavities, see, for example, [3,4,5,6,7]. While these studies were able to obtain only a general agreement with the experimental data, they did demonstrate many of the fundamental features outlined in earlier investigations.…”

Thermo-Mechanical Finite Element Analysis/Computational Fluid Dynamics Coupling of an Interstage Seal Cavity Using Torsional Spring Analogy

“…Much of this work has been applied to turbine blade cooling applications, with early work, for example, by Heselhaus et al [2], Li and Kassab [3], Bohn et al [4,5,6] and Chew et al [7], and more recent studies by Kusterer et al [8], Davison et al [9], Starke et al [10] and He and Oldfield [11]. Recent years have seen this extended to disk cavity flow, for example by Verdicchio et al [12], Mirzamoghadam and Xiao [13], Okita and Yamawaki [14,15], Lewis et al [16], Illingworth et al [17], Alizadeh et al [18,19] and Sun et al [20].…”