Dynamic Turbine Clearance Simulation Considering the Influence of Temperature on Mechanical Load–Induced Displacements

Zelenskyi, Roman; Yepifanov, Sergiy; Martseniuk, Yevhen; Kravchenko, Igor; Loboda, Igor

doi:10.1061/(asce)as.1943-5525.0000751

Cited by 1 publication

(7 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oleynik has shown in his thesis [25] that the distribution of boundary temperatures around HP at a current operating mode is similar to the distribution at a reference mode. The calculations made with NDM of the engine under analysis also confirm that gas path temperatures proportionally change from one operating point to another [22]. In this way, we can state that a temperature similarity coefficient…”

Section: Boundary Temperaturessupporting

confidence: 63%

“…Our previous papers [21,22] generally follow the ideas of the impulse response model. First, solid models of hot parts of a turbofan had been created.…”

Section: Tip Clearance Dynamic Effectmentioning

confidence: 99%

“…Paper [22] shows that the heat transfer coefficients α i change proportionally when an operating mode varies. Using known relations between different criteria of gas flow, this chapter derives the following equation for a similarity coefficient:…”

Section: Heat Transfer Coefficientsmentioning

confidence: 99%

“…Using the disk as an example, let us now show how to consider its displacement performance in a total process of the ENDM computing. Paper [22] demonstrates that, for each value k α , the corresponding curve in Figure 5 is accurately described by a weighted sum of two exponents and therefore can be presented by: where k j is a weighting coefficient and T j is a time constant. For each value of k α , four parameters k 1 ,k 2 ,T 1 , and T 2 were determined.…”

Section: Varying Thermal Expansion Displacementsmentioning

confidence: 99%

“…elasticity change. To solve this problem, paper [22] proposes the concept of an equivalent temperature.…”

Section: Varying Force-induced Displacementsmentioning

confidence: 99%

See 4 more Smart Citations

Advanced Nonlinear Modeling of Gas Turbine Dynamics

Zelenskyi¹,

Yepifanov²,

Loboda³

2019

Aerospace Engineering

Self Cite

View full text Add to dashboard Cite

The process of gas turbine development requires different mathematical models. In particular, physics-based nonlinear dynamic models are widely used in the development of control and diagnostic systems. The present chapter firstly reviews known works on nonlinear dynamic engine modeling centering on model applications and developments. As an important development, modeling of heating up engine components is considered. This phenomenon consists in a radial clearance change during transients that influences engine static and dynamic performances. This clearance change is usually computed by a finite element method that is critical to computer resources. The chapter secondly presents a new and more rapid simulation methodology to integrate two dynamic processes, a general engine transient and a clearance change. This allows creating a more accurate and relatively fast engine dynamic model that is easy to use in the design of control and diagnostic systems. Finally, the chapter introduces further methodology enhancement consisting in the consideration of the influence of varying metal temperature on the strains induced by mechanical loads. To validate methodology, it is applied to a particular turbofan engine, and the simulated and real engine dynamic performances are compared.

show abstract

Section: Boundary Temperaturessupporting

confidence: 63%

“…Our previous papers [21,22] generally follow the ideas of the impulse response model. First, solid models of hot parts of a turbofan had been created.…”

Section: Tip Clearance Dynamic Effectmentioning

confidence: 99%

Section: Heat Transfer Coefficientsmentioning

confidence: 99%

Section: Varying Thermal Expansion Displacementsmentioning

confidence: 99%

“…elasticity change. To solve this problem, paper [22] proposes the concept of an equivalent temperature.…”

Section: Varying Force-induced Displacementsmentioning

confidence: 99%

See 3 more Smart Citations