Gas dynamic analysis of the modern single shaft gas turbine engine flow path

Abstract

The paper outlines a finite volumes refined mathematical model of the working gas flow in the flow path of the three stage modern single shaft gas turbine engine that can be used in floating power plants. Such mathematical model based on the finite volumes of hexagonal-type was constructed using the three-dimensional Navier–Stokes equations for the case of viscous working fluid flow. For the problem solution such boundary conditions as “inlet’, “outlet” and “wall” have been used. The calculation is carried out in a non-stationary setting with a time step of 1.5974 × 10−6 s, which corresponds to the angle of rotation of the rotor, relative to the stator, of 0.09°. The total number of time iterations is 350. Also, it was shown that the variation field of pressure on the blades feather surfaces and the gas flow velocity due to rotation are the critical factors, causing the blades vibration. The result was confirmed with the experiment. The obtained results would be used as a base for further investigations of gas flow pressure field on the blades surface, because the gas flow pressure are key factors, causing the rotor forced vibration, and as initial data for their fatigue strength and crack study.

The Modern Single Shaft Gas Turbine Rotor Stress-Strain State Determination Taking into Account the Contact Thermoelasticity Problem

“…The big temperatures of the gas flow [2] and the dynamic stresses level are the reasons for the new studies in the fields of the turbine rotor plasticity and creep. All the obtained results together with the data given in [1,2] and methodology given in [20] would be used for further studies of the modern GTE rotor creep and fatigue strength. The findings of the work are applicable in the areas of the power plants engine building, aircraft and marine engine building too.…”

“…As it has been known from [1,3,5,18]: , where [K e ] the finite element stiffness matrix. The vector of contact forces for the contact element AB (Fig.…”

“…On the other hand, all of these problems are interconnected, because the results of one problem solution are used as initial data for the other problems solution. Thus for the purpose of the modern single shaft three stages turbine rotor stress-strain state study the results of the fluid flow and thermal state analysis for this rotor are used as initial data [1,2]. In the working process of gas turbine rotors, which are used in modern turbines, various mechanical and thermal loads of high intensity are constantly present.…”

“…For their stress-strain state determination it is absolutely important to take into account the thermal and mechanical conditions in the impellers contact area. Also the basic contact conditions of the impellers are not always the same [1]. In the vast majority of papers each impeller and even the whole rotor is considered as one monolith solid body but this assumption does not fully correspond to the real working conditions.…”

The Modern Single Shaft Gas Turbine Rotor Stress-Strain State Determination Taking Into Account The Contact Thermoelasticity Problem

“…The study of the modern single shaft gas turbine rotor stress-strain state has been held. All the obtained results together with the data given in [1,2] would be used for the further studies of the modern GTE rotor creep and fatigue strength.…”