3D CFD Analysis of an Industrial Gas Turbine Compartment Ventilation System

Abstract

The proper design of the compartment ventilation system is an important requirement in the gas turbine industry. A poor ventilation system not only causes a circumferentially nonuniform casing temperature distribution, but also allows the formation of dangerous gas pockets inside the enclosure. Further, the presence of a circumferential casing temperature gradient has a negative impact on the operational efficiency of the turbine. Keeping the above design objectives in mind, a three-dimensional CFD analysis has been carried out using a leading commercial code to analyze the effectiveness of GE MS5002E ventilation system. A detailed geometric model is developed by including the entire turbine casing, various pipelines, surfaces of inlet and exhaust plenums, roof (with ventilation air inlets and outlet) and walls. Surfaces of all the components in the auxiliary compartment are also captured in the model. For easy meshing, the gas turbine compartment is divided into five regions: 1) inlet plenum and inlet case, 2) compressor, 3) compressor discharge case, 4) HPT and LPT, and 5) exhaust plenum. After meshing, these regions and the auxiliary compartment are combined using arbitray interfaces. A steady incompressible, high Reynolds number k-ε turbulence model is used in the present analysis. Except the casing external surfaces, temperatures are specified on the surfaces of various components, pipes, enclosure inside walls and roof. The casing temperature is determined using conjugate heat transfer modeling in which convective boundary conditions are stipulated on the casing interior surfaces and conduction through casing walls is solved as a part of the CFD solution. Radiation boundary conditions are applied on the casing external surfaces, enclosure walls and roof. Most of the pipes are included in the model. Small regions are modeled as porous media. Buoyancy effects are accounted in the model. The present CFD results will be used in conjunction with prototype testing to optimize the ventilation layout.

Numerical Study of the Ejection Cooling Mechanism of Ventilation for a Marine Gas Turbine Enclosure

“…However, current scholarly research is focused on forced cooling ventilation. CFD (Computational Fluid Dynamics) numerical simulations and experiments are used to obtain the distribution of airflow velocity and temperature inside the enclosure, as well as airflow organisation in the event of a gas leak [13][14][15]. Although there are relatively few references on the use of ejection cooling to reduce the internal temperature of gas turbine enclosures, ejecting systems have been studied relatively extensively for other applications.…”

Experimental research on the thermal state of a shell for noise and heat insulation of the gte90l2 gas turbine engine used for the mechanical drive of the gcu-c-16s turbo-compressor package

“…В конструкціях ГПА, що створюються в ПАТ «Сумське машинобудівне науково-виробниче об'єднання» (Україна) (далі СМНВО), турбоблок проектуванні ГПА. У зв'язку з цим доцільно більш ретельно проаналізувати результати робіт, в яких йдеться про дослідження різними методами теплового стану укриттів ГТД, що використовують у якості механічного приводу [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Assessment of the effectiveness of ventilation for gas turbine generator set safety

“…The modeling of flow path within gas turbine enclosure should be as detailed as possible since it has been proven that structures would have the effect on the distortion of flow by previous studies. [3][4][5] Thus, a number of devices such as pumps, motors, valves and pipes apart from the core engine should be modelled, which may raise the difficulty in grids refinement. Some researchers tried to simplify the modeling of pipelines by using porous model for the modeling of pipelines, 6 but not adequate validations were found for this method.…”

“…They have fuel capability of both gas fuel and liquid fuel which can be comprehensively used for power generation. For a general ZK2000 generator set, gas turbine and auxiliary systems are mounted on an 8 m long and 2.4 m width base skid and enclosed in an acoustic enclosure with net volume of about 31 m 3 . The generator set is designed with forced ventilation at about 21,000 m 3 /h flow rate.…”